[上]JAVA学习系列模块四第三章83.switch语句_case的穿透性
视频
笔记
1.如果没有break,就会出现case的穿透性,程序就一直往下穿透执行,直到遇到了break或者switch代码执行完毕了,就停止了
public class Demo02Switch {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int data = sc.nextInt();
switch (data){
case 1:
System.out.println("鹅鹅鹅");
case 2:
System.out.println("曲项向天歌");
case 3:
System.out.println("白毛浮绿水");
case 4:
System.out.println("红掌拨清波");
break;
default:
System.out.println("下面没有了");
break;
}
}
}
public class Demo03Switch {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int month = sc.nextInt();
switch(month){
case 12:
System.out.println("冬季");
break;
case 1:
System.out.println("冬季");
break;
case 2:
System.out.println("冬季");
break;
case 3:
System.out.println("春季");
break;
case 4:
System.out.println("春季");
break;
case 5:
System.out.println("春季");
break;
case 6:
System.out.println("夏季");
break;
case 7:
System.out.println("夏季");
break;
case 8:
System.out.println("夏季");
break;
case 9:
System.out.println("秋季");
break;
case 10:
System.out.println("秋季");
break;
case 11:
System.out.println("秋季");
break;
default:
System.out.println("什么情况,你家有这个月份?");
}
}
}
public class Demo03Switch {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int month = sc.nextInt();
switch(month){
case 12:
case 1:
case 2:
System.out.println("冬季");
break;
case 3:
case 4:
case 5:
System.out.println("春季");
break;
case 6:
case 7:
case 8:
System.out.println("夏季");
break;
case 9:
case 10:
case 11:
System.out.println("秋季");
break;
default:
System.out.println("什么情况,你家有这个月份?");
}
}
}