java创建线程的方式有几种?
java创建线程的方式有几种?这篇文章运用了实例代码展示,代码非常详细,可供感兴趣的小伙伴们参考借鉴,希望对大家有所帮助。
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1、继承Thread类
public class ThreadCreator extends Thread{ public static void main(String[] args) { //第一种方式: ThreadCreator creator = new ThreadCreator(); Thread thread = new Thread(creator,"线程1"); thread.start(); //第二种方式: Thread thread = new ThreadCreator(); thread.start(); //第三种方式: new ThreadCreator().start(); } @Override public void run() { System.out.println(Thread.currentThread().getName() + "run"); } }
2、实现Runnable接口
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public class ThreadCreator implements Runnable{ public static void main(String[] args) { ThreadCreator creator = new ThreadCreator(); Thread thread = new Thread(creator,"线程1"); thread.start(); } @Override public void run() { System.out.println(Thread.currentThread().getName() + "run"); } }
3、实现Callable接口
public class ThreadCreator implements Callable{ public static void main(String[] args) throws ExecutionException, InterruptedException { ThreadCreator creator = new ThreadCreator(); FutureTask futureTask = new FutureTask(creator); Thread thread = new Thread(futureTask,"线程"); thread.start(); System.out.println(futureTask.get()); } @Override public Integer call() { return 1024; } }
4、线程池ExecutorService
public class ThreadCreator{ static ExecutorService service = Executors.newFixedThreadPool(5); public static void main(String[] args) throws ExecutionException, InterruptedException { //execute无返回值 service.execute(new ThreadTask(1,"1")); //submit有返回值 Futureresult = service.submit(new ThreadTaskCall()); System.out.println(result.get()); service.shutdownNow(); } static class ThreadTask implements Runnable{ private int param1; private String param2; public ThreadTask(int param3,String param4){ this.param1 = param3; this.param2 = param4; } @Override public void run() { System.out.println(param1+param2); } } static class ThreadTaskCall implements Callable { @Override public Integer call() throws Exception { return 1024; } } }
线程池中submit和execute的区别:
(1)可接受的任务类型不一样:execute只能接受Runnable任务,submit还可以接受Callable任务。
(2)返回值:execute无返回值,任务一旦提交,无法在当前线程中监控执行结果。submit有一个Future类型的返回值,用来接收返回值或响应异常。通过get()方法获取。
submit底层还是调用的execute,只是在此基础上用future封装了一层,并将执行过程中产生的异常全部封装在一个变量中:
public void run() { if (state != NEW || !UNSAFE.compareAndSwapObject(this, runnerOffset, null, Thread.currentThread())) return; try { Callablec = callable; if (c != null && state == NEW) { V result; boolean ran; try { result = c.call(); ran = true; } catch (Throwable ex) { result = null; ran = false; setException(ex); } if (ran) set(result); } } finally { runner = null; int s = state; if (s >= INTERRUPTING) handlePossibleCancellationInterrupt(s); } } protected void setException(Throwable t) { if (UNSAFE.compareAndSwapInt(this, stateOffset, NEW, COMPLETING)) { outcome = t; UNSAFE.putOrderedInt(this, stateOffset, EXCEPTIONAL); // final state finishCompletion(); } }
另外,spring中的schedule注解借鉴使用了submit的处理方式。
5、匿名内部类
public class ThreadCreator { public static void main(String[] args) { //继承Thread类 new Thread() { @Override public void run() { System.out.println("extends Thread Class!"); } }.start(); //实现Runnable接口 new Thread(new Runnable() { @Override public void run() { System.out.println("implement Runnable!"); } }).start(); //实现Callable接口 new Thread(new FutureTask(new Callable() { @Override public Integer call() throws Exception { return 1024; } })).start(); //lambda表达式 new Thread(() -> System.out.println("execute single code")).start(); new Thread(() -> { System.out.println("execute multiple code"); }).start(); } }
lambda线程池:
public class ThreadCreator { static ExecutorService service = Executors.newFixedThreadPool(5); static List list = new ArrayList(); public static void main(String[] args) { service.execute(() -> execute()); //无返回值 Future future = service.submit(() -> execute()); //有返回值 list.add(future); } public static void execute() { //do something } }
以上就是java创建线程的方式汇总,内容较为全面,小编相信有部分知识点可能是我们日常工作可能会见到或用到的。希望你能通过这篇文章学到更多知识。
文章名称:java创建线程的方式有几种?
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