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 1、多线程按规定顺序输出

package test;import java.util.HashSet;import java.util.Set;public class Main12 {    public static void main(String[] args) {        String[] strs={"_A","_B","_C"};        Thread pre=Thread.currentThread();        for(int i=0;i<3;i++){           Thread thread=new Thread(new Domio(strs[i],pre));           thread.start();           pre=thread;        }        System.out.print("begin");    }    static class Domio implements Runnable{        private String str;        private Thread thread;        public Domio(String str,Thread thread){            this.str=str;            this.thread=thread;        }        @Override        public void run() {            String string=this.str;            try {                this.thread.join();            } catch (InterruptedException e) {                e.printStackTrace();            }            System.out.print(str);        }    }}输出：begin_A_B_C

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