Java Concurrent Exchanger

import java.util.concurrent.Exchanger;
public class ExchangerDemo {
    static Exchanger exchanger = new Exchanger();
    static void startReadThread(){
        new Thread(new Runnable() {
            @Override
            public void run() {
                String temp="23333";
                System.out.println("ThreadA temp:"+temp);
                for(int i=0;i<10;i++){
                    System.out.println("线程A 已执行"+i+"秒");
                    if (i==4){
                        try {
                            temp= (String) exchanger.exchange(temp);
                            System.out.println("发生数据交换");
                            System.out.println("ThreadA temp:"+temp);
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                    }
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }).start();
    }
    static void startOperateThread(){
        new Thread(new Runnable() {
            @Override
            public void run() {
                String temp="11111111";
                System.out.println("ThreadB temp:"+temp);
                for(int i=0;i<10;i++){
                    System.out.println("线程B 已执行"+i+"秒");
                    if (i==9){
                        try {
                            temp= (String) exchanger.exchange(temp);
                            System.out.println("发生数据交换");
                            System.out.println("ThreadB temp:"+temp);
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                    }
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }).start();
    }
    public static void main(String []args) {
        startReadThread();
        startOperateThread();
    }
}