001 Thread creation and startup

I. Overview

There are two ways to create threads in java,

　　[1] Inherit Thread and override the run() method

　　[2] Implement the Runnable interface and implement the run() method.

　　The high-level interface in JUC is actually completed in these two ways.

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2. Inherit Thread to create a thread.

public  class CreateThread {
     public  static  void main(String[] args) {
         // Create a thread and complete the task together 
                new Thread() {
                    @Override
                    public void run() {
                        task1();
                    }
                    
                }.start();
                
                new Thread() {
                    @Override
                    public void run() {
                        task2();
                    };
                }.start();
    }

    public static void task1() {
        for(int i=0;i<20;i++) {
            try {
                TimeUnit.SECONDS.sleep(1);
            } catch (InterruptedException e) {
                e.printStackTrace ();
            }
            System.out.println("task1===>"+i);
        }
    }
    public static void  task2() {
        for(int i=0;i<20;i++) {
            try {
                TimeUnit.SECONDS.sleep(1);
            } catch (InterruptedException e) {
                e.printStackTrace ();
            }
            System.out.println("task2===>"+i);
        }
    }
}

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3. Implement the Runnable interface to create threads

public class UseRunnable {
    public static void main(String[] args) {
        new Thread(new Runnable() {
            public void run() {
                task1();
            }
        }).start();
        
        new Thread(new Runnable() {
            public void run() {
                task2();
            }
        }).start();
    }
    public static void task1() {
        for(int i=0;i<20;i++) {
            try {
                TimeUnit.SECONDS.sleep(1);
            } catch (InterruptedException e) {
                e.printStackTrace ();
            }
            System.out.println("task1===>"+i);
        }
    }
    public static void  task2() {
        for(int i=0;i<20;i++) {
            try {
                TimeUnit.SECONDS.sleep(1);
            } catch (InterruptedException e) {
                e.printStackTrace ();
            }
            System.out.println("task2===>"+i);
        }
    }
}

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4. Strategy Mode

In fact, there is only one way to create a thread, that is to create a Thread object.

So how do we use the Runnable interface?

This is the use of a strategy pattern.