Java: Define and start threads inside methods using anonymous inner classes

The following code shows how to define a Thread through an anonymous inner class in a method, Override its run() method, and then start the thread directly.

Such code can be used to perform a side task by starting a new thread within a class. Generally, such tasks are not the main design content of the class.

package com.zj.concurrency;
 
public class StartFromMethod {
    private Thread t;
    private int number;
    private int count = 1;
 
    public StartFromMethod(int number) {
       this.number = number;
    }
 
    public void runTask() {
       if (t == null) {
           t = new Thread() {
              public void run() {
                  while (true) {
                     System.out.println("Thread-" + number + " run " + count
                            + " time(s)");
                     if (++count == 3)
                         return;
                  }
              }
           };
           t.start();
       }
    }
 
    public static void main(String[] args) {
       for (int i = 0; i < 5; i++)
           new StartFromMethod(i).runTask();
    }
}

Result:

Thread-0 run 1 time(s)

Thread-0 run 2 time(s)

Thread-1 run 1 time(s)

Thread-1 run 2 time(s)

Thread-2 run 1 time(s)

Thread-2 run 2 time(s)

Thread-3 run 1 time(s)

Thread-3 run 2 time(s)

Thread-4 run 1 time(s)

Thread-4 run 2 time(s)

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