原创：转载需注明原创地址 https://www.cnblogs.com/fanerwei222/p/11871727.html

Java线程--Callable使用

Callable和Runnable使用差不多, 但是Callable有返回值, 可以用Future接收. 看代码:

public static void main(String[] args) {
    Callable callable = new Callable() {
        @Override
        public Object call() throws Exception {
            return "this is Callable's message";
        }
    };
    /**
     * 将callable丢进任务里面
     */
    FutureTask futureTask = new FutureTask(callable);

    /**
     * 启动线程, 执行任务
     */
    new Thread(futureTask).start();
    try {
        Thread.sleep(3000);
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
    try {
        System.out.println("执行任务后的结果: " + futureTask.get());
    } catch (ExecutionException e) {
        e.printStackTrace();
    }  catch (InterruptedException e) {
        e.printStackTrace();
    }
}

打印如下:

执行任务后的结果: this is Callable's message