本文展示了一个使用Java实现的并发程序，通过创建两个线程并实现Runnable接口来并发打印数字，展示了多线程环境下如何有序打印变量的实例。
public class SecondThread implements Runnable{
private int i;
public void run(){
for (; i < 3; i++){
System.out.println(Thread.currentThread().getName() + " " + i);
}
}
public static void main(String args[]){
SecondThread st = new SecondThread();
new Thread(st, "Thread A").start();
new Thread(st, "Thread B").start();
}
}class SecondThread implements Runnable{
private int i;
public void run(){
for (; i < 3; i++){
System.out.println(Thread.currentThread().getName() + " " + i);
}
}
}
public class ThreadDemo02{
public static void main(String args[]){
SecondThread st = new SecondThread();
new Thread(st, "Thread A").start();
new Thread(st, "Thread B").start();
}
}-------------------------------------------------
Thread A 0
Thread A 1
Thread A 2
-------------------------------------------------
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