Ushtrime mbi klasat dhe objektet
public class KlasaIme{
int x = 5;
public static void main(String[] args) {
KlasaIme obj1= new KlasaIme(); // Objekti 1
KlasaIme obj2= new KlasaIme(); // Objekti 2
System.out.println(obj1.x);
System.out.println(obj2.x);
}
}
Shume Objekte ne 1 klase
public class KlasaIme{
int x = 5;
public static void main(String[] args) {
KlasaIme obj1 = new KlasaIme(); // Objekti 1
KlasaIme obj2= new KlasaIme(); // Objekti 2
obj2.x = 25;
System.out.println(obj1.x); // Afishon 5
System.out.println(obj2.x); // Afishon 25
}
Konstruktoret
public class Makina {
int vitiModelit;
String emriModelit;
public Makina (int viti, String emri) {
vitiModelit= viti;
emriModelit= emri;
}
public static void main(String[] args) {
Makina makinaIme= new Makina(1969, "Mustang");
System.out.println(makinaIme.vitiModelit+ " " + makinaIme.emriModelit);
}
}
// Afishon: 1969 Mustang
Inheritance (Trashgimia)
class Automjeti {
protected String modeli= "Ford";
public void buria() {
System.out.println("Tuut, tuut!");
}
}
class Automjeti extends Automjeti {
private String modeliEmri= "Mustang";
public static void main(String[] args) {
Automjeti makinaimeShpejte= new Automjeti();
makinaimeShpejte.buria();
System.out.println(makinaimeShpejte.modeli+ " " + makinaimeShpejte.modeliEmri);
}
}
Notat e nje Studenti
import java.util.Scanner;
public class NotaStudenti
{
public static void main(String args[])
{
int notat[] = new int[6];
int i;
float total=0, mes;
Scanner scanner = new Scanner(System.in);
for(i=0; i<6; i++) {
System.out.print("Vondos notat e Lendes"+(i+1)+":");
notat[i] = scanner.nextInt();
total = total + notat[i];
}
scanner.close();
mes = total/6;
System.out.print("Nota e Studentit eshte: ");
if(mes>=80)
{
System.out.print("Exelent");
}
else if(mes>=60 && mes<80)
{
System.out.print(" Shume Mire");
}
else if(mes>=40 && mes<60)
{
System.out.print("Mire");
}
else
{
System.out.print("Keq");
}
}
}
Ushtrimi 2: Gjenu numrin e 3te me te madh
public class nrtretemeimadh{
public static int gjejtret(int[] a, int total){
int temp;
for (int i = 0; i < total; i++)
{
for (int j = i + 1; j < total; j++)
{
if (a[i] > a[j])
{
temp = a[i];
a[i] = a[j];
a[j] = temp;
}
}
}
return a[total-3];
}
public static void main(String args[]){
int a[]={1,2,5,6,3,2};
int b[]={44,66,99,77,33,22,55};
System.out.println("I treti me i madh: "+gjejtret(a,6));
System.out.println("I treti me i madh: "+gjejtret(b,7));
}}
Ushtrimi 3: Mbledhja e 2 matricave
public class matrica{
public static void main(String args[]){
int a[][]={{1,3,4},{2,4,3},{3,4,5}};
int b[][]={{1,3,4},{2,4,3},{1,2,4}};
int c[][]=new int[3][3];
for(int i=0;i<3;i++){
for(int j=0;j<3;j++){
c[i][j]=a[i][j]+b[i][j];
System.out.print(c[i][j]+" ");
}
System.out.println();
}
}}
Program i cili numeron fjalet ne nje fjali
import java.util.Scanner;
public class Exercise5 {
public static void main(String[] args)
{
Scanner in = new Scanner(System.in);
System.out.print("Vendos nje fjali: ");
String str = in.nextLine();
System.out.print("Numri fjaleve ne fjali: " + count_Words(str)+"\n");
}
public static int count_Words(String str)
{
int count = 0;
if (!(" ".equals(str.substring(0, 1))) || !(" ".equals(str.substring(str.length() - 1))))
{
for (int i = 0; i < str.length(); i++)
{
if (str.charAt(i) == ' ')
{
count++;
}
}
count = count + 1;
}
return count;
}
}
Konverto fjalet me te vogla ne me te medhaja
public class Exercise30 {
public static void main(String[] args)
{
String str = "Impact Education! Impact your Future!";
String upper_str = str.toUpperCase();
System.out.println("Stringu origjinal: " + str);
System.out.println("Stringu me shkronja te medha : " + upper_str);
}
}
Konverto string ne Int
public class konvertostring{
public static void main(String args[]){
String str="123";
int inum = 100;
int inum2 = Integer.parseInt(str);//konverton stringun ne int
int sum = inum+inum2;
System.out.println("Shuma eshte: "+sum);
}
}
Shuma e dy Numrave
import java.awt.*;
import javax.swing.*;
public class Test extends JFrame {
JLabel no1 = new JLabel("Number 1");
JLabel no2 = new JLabel("Number 2");
JLabel sum = new JLabel("Sum:", JLabel.CENTER);
JTextField F1 = new JTextField(5);
JTextField F2 = new JTextField(5);
JLabel no3 = new JLabel();
public Test() {
super("Test");
Container container = getContentPane();
container.setLayout(new FlowLayout());
container.add(no1);
container.add(F1);
container.add(no2);
container.add(F2);
container.add(sum);
container.add(no3);
F1.setText("5"); // set 5 in F1
F2.setText("5"); // set 5 in F2
int n1 = Integer.parseInt((F1.getText())); // 5
int n2 = Integer.parseInt((F2.getText())); // 5
int no4 = n1 + n2; // 10
String s1 = String.valueOf(no4);
no3.setText(s1);
}
public static void main(String[] args) {
Test test = new Test();
test.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
test.setSize(500, 400);
test.setVisible(true);
}
}
Llogaritesi i sasise se ujit qe duhet pire sipas peshes
package said;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
/**
* A Java Swing program that shows how much water you should drink a day.
* @author www.codejava.net
*/
public class Example extends JFrame implements ActionListener {
private JLabel labelQuestion;
private JLabel labelWeight;
private JTextField fieldWeight;
private JButton buttonTellMe;
public Example() {
super("Water Calculator");
initComponents();
setSize(240, 150);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
private void initComponents() {
labelQuestion = new JLabel("Sa uje duhet te pi?");
labelWeight = new JLabel("Pesha ime ne (kg):");
fieldWeight = new JTextField(5);
buttonTellMe = new JButton("Me trego sa?");
setLayout(new FlowLayout());
add(labelQuestion);
add(labelWeight);
add(fieldWeight);
add(buttonTellMe);
buttonTellMe.addActionListener(this);
}
public void actionPerformed(ActionEvent event) {
String message = "Ju duhet te pini %.1f L uje ne dite!";
float weight = Float.parseFloat(fieldWeight.getText());
float waterAmount = calculateWaterAmount(weight);
message = String.format(message, waterAmount);
JOptionPane.showMessageDialog(this, message);
}
private float calculateWaterAmount(float weight) {
return (weight / 10f) * 0.4f;
}
public static void main(String[] args) {
new Example().setVisible(true);
}
}
Java Swing Makine Llogaritese
import java.awt.BorderLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class Calculator implements ActionListener {
private static JTextField inputBox;
Calculator(){}
public static void main(String[] args) {
createWindow();
}
private static void createWindow() {
JFrame frame = new JFrame("Calculator");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
createUI(frame);
frame.setSize(200, 200);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
private static void createUI(JFrame frame) {
JPanel panel = new JPanel();
Calculator calculator = new Calculator();
GridBagLayout layout = new GridBagLayout();
GridBagConstraints gbc = new GridBagConstraints();
panel.setLayout(layout);
inputBox = new JTextField(10);
inputBox.setEditable(false);
JButton button0 = new JButton("0");JButton button1 = new JButton("1");
JButton button2 = new JButton("2");JButton button3 = new JButton("3");
JButton button4 = new JButton("4");JButton button5 = new JButton("5");
JButton button6 = new JButton("6");JButton button7 = new JButton("7");
JButton button8 = new JButton("8");JButton button9 = new JButton("9");
JButton buttonPlus = new JButton("+");JButton buttonMinus = new JButton("-");
JButton buttonDivide = new JButton("/");JButton buttonMultiply = new JButton("x");
JButton buttonClear = new JButton("C");JButton buttonDot = new JButton(".");
JButton buttonEquals = new JButton("=");
button1.addActionListener(calculator);button2.addActionListener(calculator);
button3.addActionListener(calculator);button4.addActionListener(calculator);
button5.addActionListener(calculator);button6.addActionListener(calculator);
button7.addActionListener(calculator);button8.addActionListener(calculator);
button9.addActionListener(calculator);button0.addActionListener(calculator);
buttonPlus.addActionListener(calculator);buttonMinus.addActionListener(calculator);
buttonDivide.addActionListener(calculator);buttonMultiply.addActionListener(calculator);
buttonClear.addActionListener(calculator);buttonDot.addActionListener(calculator);
buttonEquals.addActionListener(calculator);
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.gridx = 0; gbc.gridy = 0; panel.add(button1, gbc);
gbc.gridx = 1; gbc.gridy = 0; panel.add(button2, gbc);
gbc.gridx = 2; gbc.gridy = 0; panel.add(button3, gbc);
gbc.gridx = 3; gbc.gridy = 0; panel.add(buttonPlus, gbc);
gbc.gridx = 0; gbc.gridy = 1; panel.add(button4, gbc);
gbc.gridx = 1; gbc.gridy = 1; panel.add(button5, gbc);
gbc.gridx = 2; gbc.gridy = 1; panel.add(button6, gbc);
gbc.gridx = 3; gbc.gridy = 1; panel.add(buttonMinus, gbc);
gbc.gridx = 0; gbc.gridy = 2; panel.add(button7, gbc);
gbc.gridx = 1; gbc.gridy = 2; panel.add(button8, gbc);
gbc.gridx = 2; gbc.gridy = 2; panel.add(button9, gbc);
gbc.gridx = 3; gbc.gridy = 2; panel.add(buttonDivide, gbc);
gbc.gridx = 0; gbc.gridy = 3; panel.add(buttonDot, gbc);
gbc.gridx = 1; gbc.gridy = 3; panel.add(button0, gbc);
gbc.gridx = 2; gbc.gridy = 3; panel.add(buttonClear, gbc);
gbc.gridx = 3; gbc.gridy = 3; panel.add(buttonMultiply, gbc);
gbc.gridwidth = 3;
gbc.gridx = 0; gbc.gridy = 4; panel.add(inputBox, gbc);
gbc.gridx = 3; gbc.gridy = 4; panel.add(buttonEquals, gbc);
frame.getContentPane().add(panel, BorderLayout.CENTER);
}
public void actionPerformed(ActionEvent e) {
String command = e.getActionCommand();
if (command.charAt(0) == 'C') {
inputBox.setText("");
}else if (command.charAt(0) == '=') {
inputBox.setText(evaluate(inputBox.getText()));
}else {
inputBox.setText(inputBox.getText() + command);
}
}
public static String evaluate(String expression) {
char[] arr = expression.toCharArray();
String operand1 = "";String operand2 = "";String operator = "";
double result = 0;
for (int i = 0; i < arr.length; i++) {
if (arr[i] >= '0' && arr[i] <= '9' || arr[i] == '.') {
if(operator.isEmpty()){
operand1 += arr[i];
}else{
operand2 += arr[i];
}
}
if(arr[i] == '+' || arr[i] == '-' || arr[i] == '/' || arr[i] == '*') {
operator += arr[i];
}
}
if (operator.equals("+"))
result = (Double.parseDouble(operand1) + Double.parseDouble(operand2));
else if (operator.equals("-"))
result = (Double.parseDouble(operand1) - Double.parseDouble(operand2));
else if (operator.equals("/"))
result = (Double.parseDouble(operand1) / Double.parseDouble(operand2));
else
result = (Double.parseDouble(operand1) * Double.parseDouble(operand2));
return operand1 + operator + operand2 + "=" +result;
}
}
Leksione plus
Ushtrime dhe Shembuj
//STEP 1. Import required packages
import java.sql.*;
public class JDBCExample {
// JDBC driver name and database URL
static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
static final String DB_URL = "jdbc:mysql://localhost/STUDENTS";
// Database credentials
static final String USER = "username";
static final String PASS = "password";
public static void main(String[] args) {
Connection conn = null;
Statement stmt = null;
try{
//STEP 2: Register JDBC driver
Class.forName("com.mysql.jdbc.Driver");
//STEP 3: Open a connection
System.out.println("Connecting to a selected database...");
conn = DriverManager.getConnection(DB_URL, USER, PASS);
System.out.println("Connected database successfully...");
//STEP 4: Execute a query
System.out.println("Creating table in given database...");
stmt = conn.createStatement();
String sql = "CREATE TABLE REGISTRATION " +
"(id INTEGER not NULL, " +
" first VARCHAR(255), " +
" last VARCHAR(255), " +
" age INTEGER, " +
" PRIMARY KEY ( id ))";
stmt.executeUpdate(sql);
System.out.println("Created table in given database...");
}catch(SQLException se){
//Handle errors for JDBC
se.printStackTrace();
}catch(Exception e){
//Handle errors for Class.forName
e.printStackTrace();
}finally{
//finally block used to close resources
try{
if(stmt!=null)
conn.close();
}catch(SQLException se){
}// do nothing
try{
if(conn!=null)
conn.close();
}catch(SQLException se){
se.printStackTrace();
}//end finally try
}//end try
System.out.println("Goodbye!");
}//end main
}//end JDBCExample
Working connection
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Properties;
public class said {
public static void main(String[] args) {
// creates three different Connection objects
Connection conn1 = null;
Connection conn2 = null;
Connection conn3 = null;
try {
// connect way #1
String url1 = "jdbc:mysql://localhost:3306/sakila";
String user = "root";
String password = "rootroot";
conn1 = DriverManager.getConnection(url1, user, password);
if (conn1 != null) {
System.out.println("Connected to the database test1");
}
} catch (SQLException ex) {
System.out.println("An error occurred. Maybe user/password is invalid");
ex.printStackTrace();
}
}
}
Calculator
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class Calculator extends JPanel implements ActionListener {
private JTextField display = new JTextField("0");
private double result = 0;
private String operator = "=";
private boolean calculating = true;
public Calculator() {
setLayout(new BorderLayout());
display.setEditable(false);
add(display, "North");
JPanel panel = new JPanel();
panel.setLayout(new GridLayout(4, 4));
String buttonLabels = "789/456*123-0.=+";
for (int i = 0; i < buttonLabels.length(); i++) {
JButton b = new JButton(buttonLabels.substring(i, i + 1));
panel.add(b);
b.addActionListener(this);
}
add(panel, "Center");
}
public void actionPerformed(ActionEvent evt) {
String cmd = evt.getActionCommand();
if ('0' <= cmd.charAt(0) && cmd.charAt(0) <= '9' || cmd.equals(".")) {
if (calculating)
display.setText(cmd);
else
display.setText(display.getText() + cmd);
calculating = false;
} else {
if (calculating) {
if (cmd.equals("-")) {
display.setText(cmd);
calculating = false;
} else
operator = cmd;
} else {
double x = Double.parseDouble(display.getText());
calculate(x);
operator = cmd;
calculating = true;
}
}
}
private void calculate(double n) {
if (operator.equals("+"))
result += n;
else if (operator.equals("-"))
result -= n;
else if (operator.equals("*"))
result *= n;
else if (operator.equals("/"))
result /= n;
else if (operator.equals("="))
result = n;
display.setText("" + result);
}
public static void main(String[] args) {
JFrame.setDefaultLookAndFeelDecorated(true);
JFrame frame = new JFrame();
frame.setTitle("Calculator");
frame.setSize(200, 200);
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
Container contentPane = frame.getContentPane();
contentPane.add(new Calculator());
frame.show();
}
}
Shumzimi i dy numrava
import java.util.Scanner;
public class Exercise5 {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
System.out.print("Vendos numrin e pare: ");
int num1 = in.nextInt();
System.out.print("Vendos numrin e dyte: ");
int num2 = in.nextInt();
System.out.println(num1 + " x " + num2 + " = " + num1 * num2);
}
}
Perimetri dhe siperfaqja e rrethit
public class Exercise11 {
private static final double rreze = 7.5;
public static void main(String[] args) {
double perimetri = 2 * Math.PI * rreze;
double sip = Math.PI * rreze * rreze;
System.out.println("Perimetri eshte = " + perimetri);
System.out.println("Siperfaqja eshte = " + sip);
}
}
Mesatarja e semestrit shkollor
import java.util.Scanner;
public class Exercise12 {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
System.out.print("Vendos noten 1: ");
int num1 = in.nextInt();
System.out.print("Vendos noten 2: ");
int num2 = in.nextInt();
System.out.print("Vendos noten 3: ");
int num3 = in.nextInt();
System.out.print("Vendos noten 4: ");
int num4 = in.nextInt();
System.out.print("Vendos noten 5: ");
int num5 = in.nextInt();
System.out.println("Mesatarja e 5 notave eshte: " +
(num1 + num2 + num3 + num4 + num5) / 5);
}
}
Ushtrim per numrat cift dhe tek
import java.util.Scanner;
class CheckEvenOdd
{
public static void main(String args[])
{
int num;
System.out.println("Vendos nje numer te plote:");
Scanner input = new Scanner(System.in);
num = input.nextInt();
if ( num % 2 == 0 )
System.out.println("Numri juaj eshte cift");
else
System.out.println("Numri juaj eshte tek");
}
}
Llogaritja e pageses me keste
import java.util.Scanner;
public class JavaExample
{
public static void main(String args[])
{
float p, r, t, sinterest;
Scanner scan = new Scanner(System.in);
System.out.print("Vendos shumen : ");
p = scan.nextFloat();
System.out.print("Vendos perqindjen e interesit: ");
r = scan.nextFloat();
System.out.print("Koha e kestit: ");
t = scan.nextFloat();
scan.close();
sinterest = (p * r * t) / 100;
System.out.print("Interesi qe duhet te paguani: " +sinterest);
}
}
Shkruani nje Program i cili merr 10 numra dhe i kthen ne te kundertet (reverse)
import java.util.Scanner;
public class ushtr2 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Vendos 10 numra: ");
int[] n = new int[10];
// Kalon vlerat e input ne array
for (int i = 0; i < 10; i++) n[i] = input.nextInt();
// Afishon array ne reverse
for (int i = n.length - 1; i >= 0; i--)
System.out.print(n[i] + " ");
}
}
Java If-Else if - else
class Ladder {
public static void main(String[] args) {
int number = 0;
if (number > 0) {
System.out.println("Numri eshte pozitiv.");
}
else if (number < 0) {
System.out.println("Numri eshte negativ.");
}
else {
System.out.println("Numri eshte 0.");
}
}
}
Ditet e javes Switch-Case
class Day {
public static void main(String[] args) {
int week = 4;
String dita;
switch (week) {
case 1:
dita = "Hene";
break;
case 2:
dita = "Mart";
break;
case 3:
dita = "Merkur";
break;
case 4:
dita = "Enjte";
break;
case 5:
dita = "Premte";
break;
case 6:
dita = "Shtune";
break;
case 7:
dita = "Diel";
break;
default:
dita = "Nuk ka kshu dite !";
break;
}
System.out.println(dita);
}
}
Makine Llogaritese Switch Case
import java.util.Scanner;
class Calculator {
public static void main(String[] args) {
char operator;
Double numri1, numri2, rezultati;
Scanner scanner = new Scanner(System.in);
System.out.print("Vendos (ose +, -, * ose /): ");
operator = scanner.next().charAt(0);
System.out.print("Vendos numri1 dhe numri2 sipas radhes: ");
numri1 = scanner.nextDouble();
numri2 = scanner.nextDouble();
switch (operator) {
case '+':
rezultati = numri1 + numri2;
System.out.print(numri1 + "+" + numri2 + " = " + rezultati);
break;
case '-':
rezultati = numri1 - numri2;
System.out.print(numri1 + "-" + numri2 + " = " + rezultati);
break;
case '*':
rezultati = numri1 * numri2;
System.out.print(numri1 + "*" + numri2 + " = " + rezultati);
break;
case '/':
rezultati = numri1 / numri2;
System.out.print(numri1 + "/" + numri2 + " = " + rezultati);
break;
default:
System.out.println("Ju lutem vendosni sakte!");
break;
}
}
}
Krijimi i klases student dhe hedhja e te dhenave
class PrintStudentDetailsUsingClasses
{
public static void main(String s[])
{
Student students[] = new Student[5];
students[0] = new Student();
students[0].emri = "Said";
students[0].pike = 45;
students[0].seksioni = 'A';
students[1] = new Student();
students[1].emri = "Smart";
students[1].pike = 78;
students[1].seksioni = 'B';
students[2] = new Student();
students[2].emri = "Ramesh";
students[2].pike = 83;
students[2].seksioni = 'A';
students[3] = new Student();
students[3].emri = "Albi";
students[3].pike = 77;
students[3].seksioni = 'A';
students[4] = new Student();
students[4].emri = "center";
students[4].pike = 93;
students[4].seksioni = 'B';
for(int i = 0; i < students.length; i++)
{
System.out.println( students[i].emri + " ne seksionin " + students[i].seksioni + " ka marre " + students[i].pike + " pike." );
}
}
}
class Student
{
String emri;
int pike;
char seksioni;
String adresa;
String celular; }
Krijimi i klases Libri
public class Book
{
// instance variable
String title;
String author;
String genre;
double price;
public static void main(String[] args)
{
// creating first object of Book
Book book1 = new Book();
// assigning instance variable values
book1.title = "Java Complete Reference";
book1.author = "Herbert Schield";
book1.genre = "Computer Programming";
book1.price = 300.0;
// creating second object of Book
Book book2 = new Book();
// assigning instance variable values
book2.title = "One, Two, Three, Infinity";
book2.author = "George Gamow";
book2.genre = "Science";
book2.price = 600.0;
System.out.println("I have two books. Which are");
System.out.println(book1.title + " written by: " + book1.author + " and the price is :" + book1.price);
System.out.println("And");
System.out.println(book2.title + " written by: " + book2.author + " and the price is :" + book2.price);
}
}
Ushtrim (MyInteger) Me metoda
public class NewMyInteger {
public static void main(String[] args) {
MyInteger n1 = new MyInteger(5);
System.out.println("n1 is even? " + n1.isEven());
System.out.println("n1 is prime? " + n1.isPrime());
System.out.println("15 is prime? " + MyInteger.isPrime(15));
char[] chars = {'3', '5', '3', '9'};
System.out.println(MyInteger.parseInt(chars));
String s = "3539";
System.out.println(MyInteger.parseInt(s));
MyInteger n2 = new MyInteger(24);
System.out.println("n2 is odd? " + n2.isOdd());
System.out.println("45 is odd? " + MyInteger.isOdd(45));
System.out.println("n1 is equal to n2? " + n1.equals(n2));
System.out.println("n1 is equal to 5? " + n1.equals(5));
}
}
class MyInteger {
int value;
MyInteger(int newValue) {
value = newValue;
}
public int getValue() {
return value;
}
public static boolean isEven(int n) {
return (n % 2 == 0);
}
public static boolean isOdd(int n) {
return !isEven(n);
}
public static boolean isPrime(int n) {
for (int f = 2; f < n / 2; f++) {
if (n % f == 0) {
return false;
}
}
return true;
}
public static boolean isEven(MyInteger n) {
return n.isEven();
}
public static boolean isOdd(MyInteger n) {
return n.isOdd();
}
public static boolean isPrime(MyInteger n) {
return n.isPrime();
}
public boolean isEven() {
return isEven(value);
}
public boolean isOdd() {
return isOdd(value);
}
public boolean isPrime() {
return isPrime(value);
}
public boolean equals(int n) {
return (value == n);
}
public boolean equals(MyInteger n) {
return equals(n.getValue());
}
public static int parseInt(String s) {
return Integer.parseInt(s);
}
public static int parseInt(char[] s) {
return parseInt(new String(s));
}
}
Program per klasat dhe subclass
public class Exercise_11_02 {
// Main method
public static void main(String[] args) {
// Create a Person, Student, Employee, Faculty, and Staff objects
Person person = new Person("John", "12 Bell street",
"3473339999", "john12@aol.com");
Student student = new Student("Mary", "100 Town Ave", "5149993333",
"mary100@aol.com", Student.FRESHMAN);
Employee employee = new Employee("Mike", "34 West street", "6189999999",
"mike80@aol.com", 910, 60000);
Faculty faculty = new Faculty("Sue", "28 Well street", "4133333333",
"sue28@aol.com", 101, 50000, "4pm to 6pm", "Professor");
Staff staff = new Staff("Tom", "90 Country road", "2030000000",
"tomcat@aol.com", 12, 65000, "Executive Assistant");
// Invoke toString of Person, Student, Employee, Faculty and Staff
System.out.println(person.toString());
System.out.println(student.toString());
System.out.println(employee.toString());
System.out.println(faculty.toString());
System.out.println(staff.toString());
}
}
Shkarko KETU
Write a program to print the area of two rectangles having sides (4,5) and (5,8) respectively by creating a class named 'Rectangle' with a method named 'Area' which returns the area and length and breadth passed as parameters to its constructor.
class Rectangle{
int length;
int breadth;
public Rectangle(int l, int b){
length = l;
breadth = b;
}
public int getArea(){
return length*breadth;
}
public int getPerimeter(){
return 2*(length+breadth);
}
}
class Ans{
public static void main(String[] args){
Rectangle a = new Rectangle(4,5);
Rectangle b = new Rectangle(5,8);
System.out.println("Area : "+a.getArea()+" Perimeter is "+a.getPerimeter());
System.out.println("Area : "+b.getArea()+" Perimeter is "+b.getPerimeter());
}
}
What will be the output of this program?
class A
{
static int i;
static
{
System.out.println(1);
i = 100;
}
}
public class StaticInitializationBlock
{
static
{
System.out.println(2);
}
public static void main(String[] args)
{
System.out.println(3);
System.out.println(A.i);
}
}
Lab 5 question
public class Alien
{
protected int eyeNum;
protected int armNum;
protected String skinColor;
protected String raceAlien;
public Alien(int eye, int arm, String skin, String race)
{
eyeNum = eye;
armNum = arm;
skinColor = skin;
raceAlien = race;
}
public void display()
{
System.out.println("The " + raceAlien + " has " + eyeNum +
" number of eyes and " + armNum + " number of arms " +
skinColor + " colour of skin.");
}
}
martianclass
public class Martian extends Alien
{
public Martian(int eye, int arm, String skin, String race)
{
super(2, 3, "red", "Martian");
}
}
CreateAliens class
public class CreateAliens
{
public static void main(String[] args)
{
Martian createMartian = new Martian();
createMartian.display();
}
}
Klasa ATM
public class ATM
{
private boolean userAuthenticated; // whether user is authenticated
private int currentAccountNumber; // current user's account number
private Screen screen; // ATM's screen
private Keypad keypad; // ATM's keypad
private CashDispenser cashDispenser; // ATM's cash dispenser
private DepositSlot depositSlot; // ATM's deposit slot
private BankDatabase bankDatabase; // account information database
// constants corresponding to main menu options
private static final int BALANCE_INQUIRY = 1;
private static final int WITHDRAWAL = 2;
private static final int DEPOSIT = 3;
private static final int EXIT = 4;
// no-argument ATM constructor initializes instance variables
public ATM()
{
userAuthenticated = false; // user is not authenticated to start
currentAccountNumber = 0; // no current account number to start
screen = new Screen(); // create screen
keypad = new Keypad(); // create keypad
cashDispenser = new CashDispenser(); // create cash dispenser
depositSlot = new DepositSlot(); // create deposit slot
bankDatabase = new BankDatabase(); // create acct info database
} // end no-argument ATM constructor
// start ATM
public void run()
{
// welcome and authenticate user; perform transactions
while ( true )
{
// loop while user is not yet authenticated
while ( !userAuthenticated )
{
screen.displayMessageLine( "\nWelcome!" );
authenticateUser(); // authenticate user
} // end while
performTransactions(); // user is now authenticated
userAuthenticated = false; // reset before next ATM session
currentAccountNumber = 0; // reset before next ATM session
screen.displayMessageLine( "\nThank you! Goodbye!" );
} // end while
} // end method run
// attempts to authenticate user against database
private void authenticateUser()
{
screen.displayMessage( "\nPlease enter your account number: " );
int accountNumber = keypad.getInput(); // input account number
screen.displayMessage( "\nEnter your PIN: " ); // prompt for PIN
int pin = keypad.getInput(); // input PIN
// set userAuthenticated to boolean value returned by database
userAuthenticated =
bankDatabase.authenticateUser( accountNumber, pin );
// check whether authentication succeeded
if ( userAuthenticated )
{
currentAccountNumber = accountNumber; // save user's account #
} // end if
else
screen.displayMessageLine(
"Invalid account number or PIN. Please try again." );
} // end method authenticateUser
// display the main menu and perform transactions
private void performTransactions()
{
// local variable to store transaction currently being processed
Transaction currentTransaction = null;
boolean userExited = false; // user has not chosen to exit
// loop while user has not chosen option to exit system
while ( !userExited )
{
// show main menu and get user selection
int mainMenuSelection = displayMainMenu();
// decide how to proceed based on user's menu selection
switch ( mainMenuSelection )
{
// user chose to perform one of three transaction types
case BALANCE_INQUIRY:
case WITHDRAWAL:
case DEPOSIT:
// initialize as new object of chosen type
currentTransaction =
createTransaction( mainMenuSelection );
currentTransaction.execute(); // execute transaction
break;
case EXIT: // user chose to terminate session
screen.displayMessageLine( "\nExiting the system..." );
userExited = true; // this ATM session should end
break;
default: // user did not enter an integer from 1-4
screen.displayMessageLine(
"\nYou did not enter a valid selection. Try again." );
break;
} // end switch
} // end while
} // end method performTransactions
// display the main menu and return an input selection
private int displayMainMenu()
{
screen.displayMessageLine( "\nMain menu:" );
screen.displayMessageLine( "1 - View my balance" );
screen.displayMessageLine( "2 - Withdraw cash" );
screen.displayMessageLine( "3 - Deposit funds" );
screen.displayMessageLine( "4 - Exit\n" );
screen.displayMessage( "Enter a choice: " );
return keypad.getInput(); // return user's selection
} // end method displayMainMenu
// return object of specified Transaction subclass
private Transaction createTransaction( int type )
{
Transaction temp = null; // temporary Transaction variable
// determine which type of Transaction to create
switch ( type )
{
case BALANCE_INQUIRY: // create new BalanceInquiry transaction
temp = new BalanceInquiry(
currentAccountNumber, screen, bankDatabase );
break;
case WITHDRAWAL: // create new Withdrawal transaction
temp = new Withdrawal( currentAccountNumber, screen,
bankDatabase, keypad, cashDispenser );
break;
case DEPOSIT: // create new Deposit transaction
temp = new Deposit( currentAccountNumber, screen,
bankDatabase, keypad, depositSlot );
break;
} // end switch
return temp; // return the newly created object
} // end method createTransaction
} // end class ATM
Klasa Screen
public class Screen
{
// displays a message without a carriage return
public void displayMessage( String message )
{
System.out.print( message );
} // end method displayMessage
// display a message with a carriage return
public void displayMessageLine( String message )
{
System.out.println( message );
} // end method displayMessageLine
// display a dollar amount
public void displayDollarAmount( double amount )
{
System.out.printf( "$%,.2f", amount );
} // end method displayDollarAmount
} // end class Screen
Klasa Keypad
import java.util.Scanner; // program uses Scanner to obtain user input
public class Keypad
{
private Scanner input; // reads data from the command line
// no-argument constructor initializes the Scanner
public Keypad()
{
input = new Scanner( System.in );
} // end no-argument Keypad constructor
// return an integer value entered by user
public int getInput()
{
return input.nextInt(); // we assume that user enters an integer
} // end method getInput
} // end class Keypad
CashDispenser
public class CashDispenser
{
// the default initial number of bills in the cash dispenser
private final static int INITIAL_COUNT = 500;
private int count; // number of $20 bills remaining
// no-argument CashDispenser constructor initializes count to default
public CashDispenser()
{
count = INITIAL_COUNT; // set count attribute to default
} // end CashDispenser constructor
// simulates dispensing of specified amount of cash
public void dispenseCash( int amount )
{
int billsRequired = amount / 20; // number of $20 bills required
count -= billsRequired; // update the count of bills
} // end method dispenseCash
// indicates whether cash dispenser can dispense desired amount
public boolean isSufficientCashAvailable( int amount )
{
int billsRequired = amount / 20; // number of $20 bills required
if ( count >= billsRequired )
return true; // enough bills available
else
return false; // not enough bills available
} // end method isSufficientCashAvailable
} // end class CashDispenser
DepositSlot
public class DepositSlot
{
// indicates whether envelope was received (always returns true,
// because this is only a software simulation of a real deposit slot)
public boolean isEnvelopeReceived()
{
return true; // deposit envelope was received
} // end method isEnvelopeReceived
} // end class DepositSlot
Bank Database
public class BankDatabase
{
private Account accounts[]; // array of Accounts
// no-argument BankDatabase constructor initializes accounts
public BankDatabase()
{
accounts = new Account[ 2 ]; // just 2 accounts for testing
accounts[ 0 ] = new Account( 12345, 54321, 1000.0, 1200.0 );
accounts[ 1 ] = new Account( 98765, 56789, 200.0, 200.0 );
} // end no-argument BankDatabase constructor
// retrieve Account object containing specified account number
private Account getAccount( int accountNumber )
{
// loop through accounts searching for matching account number
for ( Account currentAccount : accounts )
{
// return current account if match found
if ( currentAccount.getAccountNumber() == accountNumber )
return currentAccount;
} // end for
return null; // if no matching account was found, return null
} // end method getAccount
// determine whether user-specified account number and PIN match
// those of an account in the database
public boolean authenticateUser( int userAccountNumber, int userPIN )
{
// attempt to retrieve the account with the account number
Account userAccount = getAccount( userAccountNumber );
// if account exists, return result of Account method validatePIN
if ( userAccount != null )
return userAccount.validatePIN( userPIN );
else
return false; // account number not found, so return false
} // end method authenticateUser
// return available balance of Account with specified account number
public double getAvailableBalance( int userAccountNumber )
{
return getAccount( userAccountNumber ).getAvailableBalance();
} // end method getAvailableBalance
// return total balance of Account with specified account number
public double getTotalBalance( int userAccountNumber )
{
return getAccount( userAccountNumber ).getTotalBalance();
} // end method getTotalBalance
// credit an amount to Account with specified account number
public void credit( int userAccountNumber, double amount )
{
getAccount( userAccountNumber ).credit( amount );
} // end method credit
// debit an amount from of Account with specified account number
public void debit( int userAccountNumber, double amount )
{
getAccount( userAccountNumber ).debit( amount );
} // end method debit
} // end class BankDatabase
More codes are here : HERE
Ndërtoni një klasë në Java të quajtur Studenti, e cila përmban tre variabla: emrin e studentit, lenden dhe noten qe ai ka marrre ne provim: Krijoni: konstruktorin e klasës Studenti metodat get() dhe set(), për të implementuar enkapsulimin një metodë toString( ), e cila shfaq të dhënat e studentit një klasë TestStudenti, në të cilën duhet të krijoni dy objekte std1 (test, Gjuhe Programimi, 9) dhe std2 (test2, Baze te dhenash, 10). Më pas thërrisni metodën afisho( ) për të shfaqur të dhënat përkatese të objekteve. Te dhenat e userave merren me scanner dhe per te krijuar objektin per studentin e dyte thjesht shtoni std2 dhe perseritni hapat tek TestStudenti
package said;
public class Student {
private int id;
private String emri;
private int lenda1;
private int lenda2;
private int lenda3;
public void setEmri(String s) {
emri = s;
}
public String getEmri() {
return emri;
}
public void setid(int r) {
if (r > 0) {
id = r;
} else {
id = 1;
}
}
public int getid() {
return id;
}
public void setLenda1(int m) {
if (m >= 4 && m <= 10) {
lenda1 = m;
} else {
lenda1 = 0;
}
}
public int getLenda1() {
return lenda1;
}
public void setLenda2(int m) {
if ((m >= 4) && (m <= 10)) {
lenda2 = m;
} else {
lenda2 = 0;
}
}
public int getLenda2() {
return lenda2;
}
public void setLenda3(int m) {
if ((m >= 4) && m <= 10) {
lenda3 = m;
} else {
lenda3 = 0;
}
}
public int getLenda3() {
return lenda3;
}
public double getmesatarja() {
return (lenda1+ lenda2 + lenda3) / 3.0;
}
public void afisho() {
System.out.println("Id e Studentit: " + id);
System.out.println("Emri: " + emri);
System.out.println("Nota ne lenden e pare: " + lenda1);
System.out.println("Nota ne lenden e dyte: " + lenda2);
System.out.println("Nota ne lenden e trete: " + lenda3);
System.out.println("Mesatarja: " + getmesatarja());
}
}
Krijojme tashme klasen TestStudent
package said;
import java.util.Scanner;
public class TestStudent {
public static void main(String[] args) {
Student std1 = new Student();
Scanner scanner = new Scanner(System.in);
System.out.print("Vendos Emrin: ");
String emri = scanner.nextLine();
std1.setEmri(emri);
System.out.print("Vendos ID: ");
int id = scanner.nextInt();
std1.setid(id);
System.out.print("Vendos noten per lenden 1: ");
int lenda1 = scanner.nextInt();
std1.setLenda1(lenda1);
System.out.print("Vendos noten per lenden 2: ");
int nota2 = scanner.nextInt();
std1.setLenda2(nota2);
System.out.print("Vendos noten per lenden 3: ");
int nota3 = scanner.nextInt();
std1.setLenda3(nota3);
System.out.println();
System.out.println("Afishimi i te dhenave me metoden afisho() =");
std1.afisho();
System.out.println();
}
}
