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java创建线程方式

2020年01月01日  | 移动技术网IT编程  | 我要评论

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

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<integer> {

    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
        future<integer> result = 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<integer>{
        @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 {
            callable<v> c = 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<integer>(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
    }
}

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