Java 并发 输出123,用多线程去处理 "123","456","789" 三个字符串，然后以"147","258","369"输出...

import java.util.concurrent.ExecutionException;

import java.util.concurrent.FutureTask;

/**

* 用多线程去处理 "123","456","789" 三个字符串，然后以"147","258","369"输出

*

*/

public class ThreadSample {

public static void main(String[] args) throws InterruptedException, ExecutionException {

String str1 = "123",str2 = "456",str3 = "789";

ProcessThread thread3 = new ProcessThread(str3, null);

ProcessThread thread2 = new ProcessThread(str2, thread3);

ProcessThread thread1 = new ProcessThread(str1, thread2);

for (int i = 0; i < str1.length(); i++) {

thread1.setIndex(i);

FutureTask future = new FutureTask(thread1);

new Thread(future).start();

String outStr = future.get();

System.out.println(outStr);

}

}

}

输出:

147

258

369

import java.util.concurrent.Callable;

import java.util.concurrent.FutureTask;

public class ProcessThread implements Callable{

private String value;

private ProcessThread next;

private Integer index;

public String call() throws Exception {

if(this.next!=null){

this.next.setIndex(this.index);

//开启下一个线程

FutureTask future = new FutureTask(this.next);

new Thread(future).start();

String nextString = future.get();

return value.charAt(this.index)+nextString;

}

return String.valueOf(value.charAt(this.index));

}

public ProcessThread(String value, ProcessThread next) {

this.value = value;

this.next = next;

}

//set/get 省略

}