2:switch:
可以用在byte,char,short 上,因为可以自动隐式的转换为int
package com;
public class Demo {
public static void main(String[] args) {
byte b = 1;
switch (b) {
case 1:
System.out.println(1);
break;
case 2:
System.out.println(2);
break;
case 3:
System.out.println(3);
break;
default:
System.out.println("没有默认的");
}
}
}
结果:
1
可以用在String上:
package com;
public class Demo {
public static void main(String[] args) {
String b = "1";
switch (b) {
case "1":
System.out.println(1);
break;
case "2":
System.out.println(2);
break;
case "3":
System.out.println(3);
break;
default:
System.out.println("没有默认的");
}
}
}
结果:
1
不可用在long类型上,long不能转换为int
package com;
public class Demo {
public static void main(String[] args) {
long b = 1;
switch (b) {
case 1:
System.out.println(1);
break;
case 2:
System.out.println(2);
break;
case 3:
System.out.println(3);
break;
default:
System.out.println("没有默认的");
}
}
}
报错:
cannot switch on a value of type long.Only convertible int values,strings or enum variables are permitted.
switch能否应用在byte ,char ,short ,long 和String上
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转载自blog.csdn.net/weixin_42321963/article/details/81006339
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