Java交换机示例不工作
我有以下代码。代码创建了两个Runnable,分别带有消息“Hello”和“World”。 我希望它能和“世界”交换“你好”,但它不起作用。代码被卡住,交换永远不会发生 更改代码如下。现在可以用了Java交换机示例不工作,java,concurrency,java.util.concurrent,Java,Concurrency,Java.util.concurrent,我有以下代码。代码创建了两个Runnable,分别带有消息“Hello”和“World”。 我希望它能和“世界”交换“你好”,但它不起作用。代码被卡住,交换永远不会发生 更改代码如下。现在可以用了 public class ExchangerExample { public static void main(String[] args) { Exchanger<String> exchanger = new Exchanger(); new Thread(() -
public class ExchangerExample {
public static void main(String[] args) {
Exchanger<String> exchanger = new Exchanger();
new Thread(() -> {
try {
String message = "Hello";
Object previous = message;
message = exchanger.exchange(message);
System.out.println(previous + " is changed to " + message);
} catch (InterruptedException e) {
e.printStackTrace();
}
}).start();
new Thread(() -> {
try {
String message = "World";
Object previous = message;
message = exchanger.exchange(message);
System.out.println(previous + " is changed to " + message);
} catch (InterruptedException e) {
e.printStackTrace();
}
}).start();
}
公共类交换示例{
公共静态void main(字符串[]args){
交换器=新交换器();
新线程(()->{
试一试{
String message=“Hello”;
对象前一个=消息;
message=交换器.exchange(message);
System.out.println(先前的+”更改为“+消息);
}捕捉(中断异常e){
e、 printStackTrace();
}
}).start();
新线程(()->{
试一试{
字符串message=“World”;
对象前一个=消息;
message=交换器.exchange(message);
System.out.println(先前的+”更改为“+消息);
}捕捉(中断异常e){
e、 printStackTrace();
}
}).start();
}
}首先,这不是编写此类程序的好设计,看起来像spagetti代码,首先编写一个
ExchangerRunnable
类:
public class ExchangerRunnable implements Runnable{
Exchanger exchanger = null;
Object object = null;
public ExchangerRunnable(Exchanger exchanger, Object object) {
this.exchanger = exchanger;
this.object = object;
}
public void run() {
try {
Object previous = this.object;
this.object = this.exchanger.exchange(this.object);
System.out.println(
Thread.currentThread().getName() +
" exchanged " + previous + " for " + this.object
);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
然后,您可以将其作为书面形式使用:
Exchanger exchanger = new Exchanger();
ExchangerRunnable exchangerRunnable1 =
new ExchangerRunnable(exchanger, "Hello");
ExchangerRunnable exchangerRunnable2 =
new ExchangerRunnable(exchanger, "World");
new Thread(exchangerRunnable1).start();
new Thread(exchangerRunnable2).start();
输出将是:
Thread-0 exchanged Hello for World
Thread-1 exchanged World for Hello
有什么问题吗?你的程序和我配合得很好,打印
世界变为Hello Hello改为World
!