线程的三种实现方法
1. Thread
通过继承Thread类来实现多线程。
继承 Thread 类,重写 run 方法。创建这个类的对象,再调用 start() 即可
package com.Unit1;
public class ThreadTest01 extends Thread{
@Override
public void run() {
for (int i = 0; i < 10000; i++) {
System.out.println(Thread.currentThread().getName() + i);
}
}
public static void main(String[] args) {
ThreadTest01 test = new ThreadTest01();
test.start();
for (int i = 0; i < 10000; i++) {
System.out.println(Thread.currentThread().getName() + i);
}
}
}
2. Runnable
通过实现Runnable接口来实现
package com.Unit1;
public class RunTest01 implements Runnable {
//设置胜者
public static String winner;
//设置长度
public static int length = 100;
@Override
public void run() {
//赛跑开始
for (int i = 0; i <= length; i++) {
System.out.println(Thread.currentThread().getName() + "已经跑了 " + i + "米");
//判断是否完成。
boolean flag = GameOver(i);
if (flag) break;
}
}
public boolean GameOver(int number) {
if (winner != null) {
return true;
} else if (number >= length) {
winner = Thread.currentThread().getName();
System.out.println("胜者是:"+winner);
return true;
}
return false;
}
public static void main(String[] args) {
RunTest01 number = new RunTest01();
new Thread(number,"1号").start();
new Thread(number,"2号").start();
new Thread(number,"3号").start();
new Thread(number,"4号").start();
new Thread(number,"5号").start();
new Thread(number,"6号").start();
new Thread(number,"7号").start();
}
}
3. Callable
通过实现Callable接口来实现,这个接口可以接受返回值。还需要引用一个FutureTask来进行传对象。
package com.Unit1;
import java.util.concurrent.*;
public class TestCallable implements Callable<Boolean> {
private int ticket = 1;
@Override
public Boolean call() throws Exception {
while(ticket <= 100 ){
System.out.println("第 " + ticket+"张票被卖了");
ticket++;
}
return true;
}
public static void main(String[] args) throws Exception{
TestCallable tc = new TestCallable();
//创建一个FutureTask实例,并传入tc对象
FutureTask<Boolean> ft = new FutureTask<>(tc);
new Thread(ft).start();
//利用ft的get得到返回值。记得向上转型。
boolean flag = (boolean) ft.get();
System.out.println(flag);
}
}