java多线程的实现可以通过以下四种方式
1.继承Thread类，重写run方法
2.实现Runnable接口，重写run方法
3.通过Callable和FutureTask创建线程
4.通过线程池创建线程
方式1,2不再赘述.
方式3,通过Callable和FutureTask创建线程实现多线程
@Test
public void MyCallableTest() throws Exception {
//创建线程执行对象
MyCallable myCallable = new MyCallable();
FutureTask<String> futureTask = new FutureTask<>(myCallable);
//执行线程
Thread thread = new Thread(futureTask);
thread.start();
//获取线程方法返回数据
System.out.println(futureTask.get());
}
/**
* 创建实现类
*/
class MyCallable implements Callable<String>{
@Override
public String call() throws Exception {
System.out.println("test thread by callable");
return "result";
}
}
方式4,通过线程池创建线程
public class ThreadPoolStu {
@Test
public void TestThreadPool1() throws InterruptedException, ExecutionException {
ExecutorService executorService = Executors.newFixedThreadPool(2);
//执行Runnable接口实现类 方式1
MyRunnable runnable1 = new MyRunnable();
executorService.execute(runnable1);
//执行Runnable接口实现类 方式2
MyRunnable runnable2 = new MyRunnable();
Future<?> future2 = executorService.submit(runnable2);
System.out.println(future2.get());//若未执行完会阻塞该线程
//执行Callable接口实现类
MyCallable callable3 = new MyCallable();
Future<String> future3 = executorService.submit(callable3);
System.out.println(future3.get());//若未执行完会阻塞该线程
// 关闭线程池
executorService.shutdown();
}
}
class MyCallable implements Callable<String>{
@Override
public String call() throws Exception {
System.out.println("test thread by callable");
return "result";
}
}
class MyRunnable implements Runnable {
@Override
public void run() {
System.out.println("thread execute");
}
}