Java: 匿名内部クラスを使用してメソッド内でスレッドを定義および開始する

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();
    }
}