一。通過繼承Thread類實現多線程
繼承Thread類,並覆蓋父類的run()方法。如下例子:
public class MyThread extends Thread {
public static void main(String[] args) {
new MyThread().start();
}
@Override
public void run(){
System.out.println("利用繼承Thread類,實現多線程。");
}
}
二。通過實現Runnable接口實現多線程
實現Runnable接口,並實現父類run()方法。如下例子:
public class MyRunnable implements Runnable {
public static void main(String[] args) {
new Thread(new MyRunnable()).start();
}
@Override
public void run() {
System.out.println("通過實現Runnable接口,實現多線程。");
}
}
三。通過線程池實現多線程
通過線程池實現多線程,本質上其實還是利用了上述兩種實現多線程的方法。線程池實現線程,如下例子:
public class MyRunnable implements Runnable {
public static void main(String[] args) throws ExecutionException, InterruptedException {
// new Thread(new MyRunnable()).start();
//創建默認線程池
ExecutorService service = Executors.newCachedThreadPool();
//把實現Runnable接口的類提交給線程池,讓線程池執行
service.submit(new MyRunnable());
//關閉線程池
service.shutdown();
}
@Override
public void run() {
System.out.println("通過實現Runnable接口,實現多線程。");
}
}
四。通過實現Callable接口實現線程
實現Callable接口並實現call()方法。例子如下:
public class MyCallable implements Callable<String> {
public static void main(String[] args) throws ExecutionException, InterruptedException {
//創建默認線程池
ExecutorService service = Executors.newCachedThreadPool();
//把實現Runnable接口的類提交給線程池,讓線程池執行
Future<String> future = service.submit(new MyCallable());
System.out.println(future.get());
service.shutdown();
}
@Override
public String call() throws Exception {
return "通過實現Callable接口,實現多線程。";
}
}
五。利用FutureTask完成多線程的使用
public class MyFutureTask {
public static void main(String[] args) throws ExecutionException, InterruptedException {
FutureTask<String> futureTask = new FutureTask<String>(new Callable<String>() {
@Override
public String call() throws Exception {
return "通過FutureTask實現多線程!";
}
});
futureTask.run();
System.out.println(futureTask.get());
}
}