java--switch选择结构
char grade = 'B';
switch (grade){
case 'A':
System.out.println("优秀");
break;//可选
case 'B':
System.out.println("良好");
break;
case 'C':
System.out.println("及格");
break;
default:
System.out.println("未知");
String name = "scx";
//表达式结果可以使字符串,字符的本质还是数字
//反编译 java----class(字节码文件)----反编译(IDEA)
switch (name){
case "s":
System.out.println("s");
break;
case "c":
System.out.println("c");
break;
case "x":
System.out.println("x");
break;