java thread

1
2package com.journaldev.threads;
3
4public class ThreadSleep {
5
6    public static void main(String[] args) throws InterruptedException {
7        long start = System.currentTimeMillis();
8        Thread.sleep(2000);
9        System.out.println("Sleep time in ms = "+(System.currentTimeMillis()-start));
10        
11    }
12
13}
14

1class ThreadJoining extends Thread 
2{ 
3    @Override
4    public void run() 
5    { 
6        for (int i = 0; i < 2; i++) 
7        { 
8            try
9            { 
10                Thread.sleep(500); 
11                System.out.println("Current Thread: "
12                        + Thread.currentThread().getName()); 
13            } 
14  
15            catch(Exception ex) 
16            { 
17                System.out.println("Exception has" + 
18                                " been caught" + ex); 
19            } 
20            System.out.println(i); 
21        } 
22    } 
23} 
24  
25class GFG 
26{ 
27    public static void main (String[] args) 
28    { 
29        ThreadJoining t1 = new ThreadJoining(); 
30        ThreadJoining t2 = new ThreadJoining(); 
31        ThreadJoining t3 = new ThreadJoining(); 
32        t1.start(); 
33        try
34        { 
35            System.out.println("Current Thread: "
36                  + Thread.currentThread().getName()); 
37            t1.join(); 
38        } 
39        catch(Exception ex) 
40        { 
41            System.out.println("Exception has " + 
42                                "been caught" + ex); 
43        } 
44        t2.start(); 
45        try
46        { 
47            System.out.println("Current Thread: "
48                 + Thread.currentThread().getName()); 
49            t2.join(); 
50        } 
51        catch(Exception ex) 
52        { 
53            System.out.println("Exception has been" + 
54                                    " caught" + ex); 
55        } 
56        t3.start(); 
57    } 
58} 

1public class ClassName extends Thread{
2  public void run(){
3    super.run();
4    //Your Code
5  }
6}
7
8public class Main{
9  public static void main(String[] args){
10    ClassName thread = new ClassName();
11    thread.start();
12  }
13}

1// Copy and test
2// They run simultaneously
3
4public static void main(String[] args) {
5  		// How to create a thread
6        Thread thread = new Thread(new Runnable() {
7            @Override
8			// Loop running in thread
9            public void run() {
10                for (int i = 0; i < 20; i++) {
11                    System.out.println("Printing plus " + i + " in a worker thread.");
12                    try {
13                        Thread.sleep(1000);
14                    } catch(Exception e) {
15                        e.printStackTrace();
16                    }
17                }
18            }
19        });
20        thread.start();
21  		// Loop running in main thread 
22        for (int j = 0; j < 20 ; j++) {
23            System.out.println("Printing plus " + j + " in a main thread.");
24            try {
25                Thread.sleep(900);
26            } catch(Exception e) {
27                e.printStackTrace();
28            }
29        }
30        }

1class RunnableObject implements Runnable {
2   private Thread t;
3   private String threadName;
4   
5   RunnableObject( String name) {
6      System.out.println("Creating " +  threadName );
7      threadName = name;
8      t = new Thread (this, threadName);
9   }
10   
11   public void run() {
12      System.out.println("Running " +  threadName );
13   }
14   
15   public void start () {
16      System.out.println("Starting " +  threadName );
17      t.start ();
18   }
19}
20
21public class TestThread {
22
23   public static void main(String args[]) {
24      RunnableObject R1 = new RunnableObject( "Thread-1");
25      R1.start();
26   }   
27}

1public static void main(String[] args {
2   ...
3   Thread t1= new Thread(...);
4   t1.start();
5   ...
6}