详解三种java实现多线程的方式

 public class thread1 extends Thread {
 
    public void run() {
        for (int i = 0; i < 10000; i++) {
            System.out.println("我是线程"+this.getId());
        }
    }
 
    public static void main(String[] args) {
        thread1 th1 = new thread1();
        thread1 th2 = new thread1();
        th1.run();
        th2.run();
    }
   }

 public class thread1 extends Thread {
     
    public void run() {
        for (int i = 0; i < 10000; i++) {
            System.out.println("我是线程"+this.getId());
        }
    }
 
    public static void main(String[] args) {
        thread1 th1 = new thread1();
        thread1 th2 = new thread1();
        th1.start();
        th2.start();
    }
}

public class thread2 implements Runnable {
 
    public String ThreadName;
     
    public thread2(String tName){
        ThreadName = tName;
    }
     
     
    public void run() {
        for (int i = 0; i < 10000; i++) {
            System.out.println(ThreadName);
        }
    }
     
    public static void main(String[] args) {
        thread2 th1 = new thread2("线程A");
        thread2 th2 = new thread2("线程B");
        th1.run();
        th2.run();
    }
}

public class thread2 implements Runnable {
 
    public String ThreadName;
     
    public thread2(String tName){
        ThreadName = tName;
    }
     
     
    public void run() {
        for (int i = 0; i < 10000; i++) {
            System.out.println(ThreadName);
        }
    }
     
    public static void main(String[] args) {
        thread2 th1 = new thread2("线程A");
        thread2 th2 = new thread2("Thread-B");
        Thread myth1 = new Thread(th1);
        Thread myth2 = new Thread(th2);
        myth1.start();
        myth2.start();
    }
}

import java.util.concurrent.*; 
import java.util.Date; 
import java.util.List; 
import java.util.ArrayList; 
  
/** 
* 有返回值的线程 
*/ 
@SuppressWarnings("unchecked") 
public class Test { 
public static void main(String[] args) throws ExecutionException, 
  InterruptedException { 
  System.out.println("----程序开始运行----"); 
  Date date1 = new Date(); 
  
  int taskSize = 5; 
  // 创建一个线程池 
  ExecutorService pool = Executors.newFixedThreadPool(taskSize); 
  // 创建多个有返回值的任务 
  List<Future> list = new ArrayList<Future>(); 
  for (int i = 0; i < taskSize; i++) { 
  Callable c = new MyCallable(i + " "); 
  // 执行任务并获取Future对象 
  Future f = pool.submit(c); 
  // System.out.println(">>>" + f.get().toString()); 
  list.add(f); 
  } 
  // 关闭线程池 
  pool.shutdown(); 
  
  // 获取所有并发任务的运行结果 
  for (Future f : list) { 
  // 从Future对象上获取任务的返回值，并输出到控制台 
  System.out.println(">>>" + f.get().toString()); 
  } 
  
  Date date2 = new Date(); 
  System.out.println("----程序结束运行----，程序运行时间【" 
   + (date2.getTime() - date1.getTime()) + "毫秒】"); 
} 
} 
  
class MyCallable implements Callable<Object> { 
private String taskNum; 
  
MyCallable(String taskNum) { 
  this.taskNum = taskNum; 
} 
  
public Object call() throws Exception { 
  System.out.println(">>>" + taskNum + "任务启动"); 
  Date dateTmp1 = new Date(); 
  Thread.sleep(1000); 
  Date dateTmp2 = new Date(); 
  long time = dateTmp2.getTime() - dateTmp1.getTime(); 
  System.out.println(">>>" + taskNum + "任务终止"); 
  return taskNum + "任务返回运行结果,当前任务时间【" + time + "毫秒】"; 
} 
}