Java中实现线程的三种方式及对比_动力节点Java学院整理

package com.thread; 
public class FirstThreadTest extends Thread{ 
  int i = 0; 
  //重写run方法，run方法的方法体就是现场执行体 
  public void run() 
  { 
    for(;i<100;i++){ 
    System.out.println(getName()+" "+i); 
    } 
  } 
  public static void main(String[] args) 
  { 
    for(int i = 0;i< 100;i++) 
    { 
      System.out.println(Thread.currentThread().getName()+" : "+i); 
      if(i==20) 
      { 
        new FirstThreadTest().start(); 
        new FirstThreadTest().start(); 
      } 
    } 
  } 
} 

package com.thread; 
public class RunnableThreadTest implements Runnable 
{ 
  private int i; 
  public void run() 
  { 
    for(i = 0;i <100;i++) 
    { 
      System.out.println(Thread.currentThread().getName()+" "+i); 
    } 
  } 
  public static void main(String[] args) 
  { 
    for(int i = 0;i < 100;i++) 
    { 
      System.out.println(Thread.currentThread().getName()+" "+i); 
      if(i==20) 
      { 
        RunnableThreadTest rtt = new RunnableThreadTest(); 
        new Thread(rtt,"新线程1").start(); 
        new Thread(rtt,"新线程2").start(); 
      } 
    } 
  } 
} 

package com.thread; 
import java.util.concurrent.Callable; 
import java.util.concurrent.ExecutionException; 
import java.util.concurrent.FutureTask; 
public class CallableThreadTest implements Callable<Integer> 
{ 
  public static void main(String[] args) 
  { 
    CallableThreadTest ctt = new CallableThreadTest(); 
    FutureTask<Integer> ft = new FutureTask<>(ctt); 
    for(int i = 0;i < 100;i++) 
    { 
      System.out.println(Thread.currentThread().getName()+" 的循环变量i的值"+i); 
      if(i==20) 
      { 
        new Thread(ft,"有返回值的线程").start(); 
      } 
    } 
    try 
    { 
      System.out.println("子线程的返回值："+ft.get()); 
    } catch (InterruptedException e) 
    { 
      e.printStackTrace(); 
    } catch (ExecutionException e) 
    { 
      e.printStackTrace(); 
    } 
  } 
  @Override 
  public Integer call() throws Exception 
  { 
    int i = 0; 
    for(;i<100;i++) 
    { 
      System.out.println(Thread.currentThread().getName()+" "+i); 
    } 
    return i; 
  } 
}