What is the execution flow of switch statement?

1. Switch statement format:

switch（表达式）{
   case 值1：
      语句体1；
      break；
   case 值2：
      语句体2；
      break；
       ...
   default：
      语句体n+1；
      break；
}

2. Format explanation:

                Expression: byte, short, int, char

# Case The value latter: It is the content used for matching the value of the expression

# Break : The meaning of the table interruption

default: When all values ​​do not match, the statement body default is executed;

3. Execution process:

                                                                                                                                                                             A: First calculate the value of the expression

##3. Execution process:

B: Compare the calculated value according to the value behind the case. Once there is a match, the corresponding statement is executed, and it is over when it encounters Break.

                          C: If all cases do not match, execute statement body n 1

4. Example code:

Scanner sc= new Scanner(System.in);
System.out.println("请输入数字1-7");
int i = sc.nextInt();
switch(i) {
case 1:
System.out.println("星期一");
break;
　　 case 2:
　　　　 System.out.println("星期二");
　　　　 break;
　　 case 3:
　　　　 System.out.println("星期三");
　　　　 break;
　　 case 4:
　　　 System.out.println("星期四");
　　　　 break;
　　 case 5:
　　　　 System.out.println("星期五");
　　　　 break;
　　 case 6:
　　　　 System.out.println("星期六");
　　　　 break;
　　 case 7:
　　　　　System.out.println("星期天1");
　　　　　break;
　　　default:
　　　　　System.out.println("请输入正确数字：");
　　　　　break;

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