JAVA-switch语句

public class ifDemo09 {
    public static void main(String[] args) {
        int light=2;
        switch (light){
            case 1:
                System.out.println("红灯停");
                break;
            case 2:
                System.out.println("绿灯行");
                break;
            case 3:
                System.out.println("黄灯亮了，等一等");
                break;
            default:
                System.out.println("信号灯故障，请在确保安全的情况下通行");

        }

    }
}