面试经典题 两线程交替输出1~100

 利用同步块和if条件交替输出

public class PrintNumber extends Thread {
    private static int cnt = 0;
    private int id;

    public PrintNumber(int _id) {
        id = _id;
    }

    @Override
    public void run() {
        while (cnt < 100) {
            if (cnt % 2 == id) {
                synchronized (PrintNumber.class) {
                    cnt++;
                    System.out.println("id:" + id + "cnt:" + cnt);
                }
            }
        }
    }

    public static void main(String[] args) {
        Thread t0 = new PrintNumber(0);
        Thread t1 = new PrintNumber(1);
        t0.start();
        t1.start();
    }
}