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

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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