├── Java.txt
├── chatbot.java
├── mouse.java
└── multithread.java


/Java.txt:
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1 | Java is a programming language and a platform. 
2 | Java is a high level, robust, object-oriented and secure programming language.
3 | Java was developed by Sun Microsystems (which is now the subsidiary of Oracle) in the year 1995. 
4 | James Gosling is known as the father of Java. Before Java, its name was Oak. 
5 | Since Oak was already a registered company, so James Gosling and his team changed the name from Oak to Java.
6 | Platform: Any hardware or software environment in which a program runs, is known as a platform.
7 | Since Java has a runtime environment (JRE) and API, it is called a platform.
8 | 


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/chatbot.java:
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 1 | import java.util.Scanner;
 2 | 
 3 | public class SimpleChatbot {
 4 |     
 5 |     public static void main(String[] args) {
 6 |         Scanner scanner = new Scanner(System.in);
 7 |         
 8 |         System.out.println("Hi there! Ask me a question.");
 9 |         String userInput = scanner.nextLine();
10 |         
11 |         if (userInput.contains("hello") || userInput.contains("hi")) {
12 |             System.out.println("Hello! How can I help you?");
13 |         } else if (userInput.contains("how are you")) {
14 |             System.out.println("I'm just a bot, but thanks for asking!");
15 |         } else {
16 |             System.out.println("I'm sorry, I don't understand that question.");
17 |         }
18 |         
19 |         scanner.close();
20 |     }
21 | }
22 | 


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/mouse.java:
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 1 | import javax.swing.*;
 2 | import java.awt.*;
 3 | import javax.swing.event.*;
 4 | import java.awt.event.*;
 5 | class A extends JFrame implements MouseListener
 6 | {
 7 | JLabel l1;
 8 | public A()
 9 | {
10 | setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
11 | setSize(400, 400);
12 | setLayout(new GridBagLayout());
13 | l1 = new JLabel();
14 | Font f = new Font("Verdana", Font.BOLD, 20);
15 | l1.setFont(f);
16 | l1.setForeground(Color.BLUE);
17 | l1.setAlignmentX(Component.CENTER_ALIGNMENT);
18 | l1.setAlignmentY(Component.CENTER_ALIGNMENT);
19 | add(l1);
20 | addMouseListener(this);
21 | setVisible(true); }
22 | public void mouseExited(MouseEvent m)
23 | {
24 | l1.setText("Mouse Exited");
25 | }
26 | public void mouseEntered(MouseEvent m)
27 | {
28 | l1.setText("Mouse Entered");
29 | }
30 | public void mouseReleased(MouseEvent m)
31 | {
32 | l1.setText("Mouse Released");
33 | }
34 | 
35 | public void mousePressed(MouseEvent m)
36 | {
37 | l1.setText("Mouse Pressed");
38 | }
39 | public void mouseClicked(MouseEvent m)
40 | {
41 | l1.setText("Mouse Clicked");
42 | } }
43 | class Mevents
44 | { public static void main(String[] args)
45 | {
46 | A a = new A();
47 | } }


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/multithread.java:
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 1 | class MultithreadingDemo extends Thread
 2 | {
 3 | public void run()
 4 | {
 5 | try
 6 | {
 7 | System.out.println("Thread " + Thread.currentThread().getId()+ " is running");
 8 | }
 9 | 
10 | catch (Exception e)
11 | {
12 | System.out.println("Exception is caught");
13 | }
14 | }
15 | }
16 | 
17 | class Multithread
18 | {
19 | public static void main(String[] args)
20 | {
21 | int n = 8;
22 | for (int i = 0; i < n; i++)
23 | {
24 | MultithreadingDemo object = new MultithreadingDemo();
25 | object.start();
26 | }
27 | }
28 | }
29 | 
30 | class MultithreadingDemo implements Runnable
31 | {
32 | public void run()
33 | {
34 | try {
35 | System.out.println( "Thread " + Thread.currentThread().getId() + " is running");
36 | }
37 | 
38 | catch (Exception e)
39 | {
40 | System.out.println("Exception is caught");
41 | }
42 | }
43 | }
44 | 
45 | class Multithread
46 | {
47 | public static void main(String[] args)
48 | {
49 | int n = 8; 
50 | for (int i = 0; i < n; i++)
51 | {
52 | Thread object = new Thread (new MultithreadingDemo());
53 | object.start ();
54 | }
55 | }}


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