线程按照顺序打印

package com.cn.test.thread;

/**
 *abc三个线程顺序打印十次 
 */
public class TestSortedThread extends Thread{
    
    static int  threadFlag = 1;
    
    public TestSortedThread(String string) {
        super(string);
    }
    
    @Override
    public void run() {
        for (int i=0; i<10; i++) {
             sortThread();
        }
    }

    // 线程排序
    private void sortThread() {
        while (threadFlag == 1) {
            if (Thread.currentThread().getName() == "thread-a") {
                System.out.println("A");
                threadFlag ++;
            } else {
                Thread.currentThread().yield();
            }
        } 
        while (threadFlag == 2) {
            if (Thread.currentThread().getName() == "thread-b") {
                System.out.println("B");
                threadFlag ++;
            } else {
                    Thread.currentThread().yield();
               }
        } 
        while (threadFlag == 3) {
            if (Thread.currentThread().getName() == "thread-c") {
                System.out.println("C");
                threadFlag = threadFlag -2 ;
            } else {
                Thread.currentThread().yield();
               }
        }
        
    }

    public static void main(String[] args) {
        TestSortedThread threadA = new TestSortedThread("thread-a");
        TestSortedThread threadB = new TestSortedThread("thread-b");
        TestSortedThread threadC = new TestSortedThread("thread-c");
        threadA.start();
        threadB.start();
        threadC.start();
    }