继承Thread，覆盖run()方法
public class ThreadA extends Thread {
@Override
public void run(){
super.run();
try {
Thread.sleep(5000L);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("这是线程A");
}
}
启动线程：
public static void main(String[] args){
ThreadA threadA=new ThreadA();
threadA.start();
System.out.println("这是主线程");
}
由于Java只能继承一个父类，所以，看着办。
实现Runnable接口，实现run()方法
public class ThreadB implements Runnable {
@Override
public void run() {
try {
Thread.sleep(5000L);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("这是线程B");
}
}
启动线程：
public static void main(String[] args){
ThreadB threadB=new ThreadB();
new Thread(threadB).start();//这里不同哦
System.out.println("这是主线程");
}
实现Callable接口，实现call()方法
public class ThreadC implements Callable<String> {
@Override
public String call() throws Exception {
Thread.sleep(5000L);
System.out.println("这是线程C");
return "thread B";
}
}
启动线程：
public static void main(String[] args){
ThreadC threadC=new ThreadC();
FutureTask<String> futureTask=new FutureTask<String>(threadC);//这里又不一样了哦
new Thread(futureTask).start();
System.out.println("主线程开始...");
//主线程运行时，才会走下面的代码
try{
System.out.println("得到的返回结果"+futureTask.get());
}catch (InterruptedException e){
e.printStackTrace();
}catch (ExecutionException e){
e.printStackTrace();
}
System.out.println("...主线程结束");
}
