一个Java线程调度的问题，运行多次，三个线程打印字符 a b 和数字总是先输出完字母，再输出数字是为什么

Question

一个Java线程调度的问题，运行多次，三个线程打印字符 a b 和数字总是先输出完字母，再输出数字是为什么

class PrintChar implements Runnable{
    private char charToPrint;
    private int times;
    public PrintChar(char c,int t){
        charToPrint=c;
        times=t;
    }

    @Override
    public void run() {
        for(int i=0;i<times;i++){
            System.out.print(charToPrint);
        }
    }
}
class PrintNum implements Runnable{
    private int lastNum;
    public PrintNum(int n){
        lastNum=n;
    }

    @Override
    public void run() {
        for(int i=0;i<=lastNum;i++){
            System.out.print(" "+i);
        }
    }
}
public class TaskThreadDemo {
    public static void main(String[] args) {
        Runnable printA=new PrintChar('a',100);
        Runnable printB=new PrintChar('b',100);
        Runnable print100=new PrintNum(100);
        Thread thread1=new Thread(printA);
        Thread thread2=new Thread(printB);
        Thread thread3=new Thread(print100);
        thread1.start();
        thread2.start();
        thread3.start();
    }
}

Answer 1

https://blog.csdn.net/weixin_62264287/article/details/134635771?spm=1001.2014.3001.5501