public class Hare implements Runnable {
    private boolean[] flags = {true, false};
    private int totalStep;
    private int step;

    public Hare(int totalStep) {
        this.totalStep = totalStep;
    }

    @Override
    public void run() {
        while (step < totalStep) {
            boolean isHareSleep = flags[((int)(Math.random() * 10)) % 2];
            if(isHareSleep) {
                System.out.println("兔子睡着了zzzz");
            }else {
                step += 2;
                System.out.printf("兔子跑了 %d 步 %n", step);
            }
        }
    }
}