How to use switch statement in Java and examples

Explanation

1. In the switch statement, the variable type can be: byte, short, int or char. Since JavaSE7, switch supports the String type, and case labels must be string constants or literals.

2. The switch sentence can have multiple case sentences. Each case is followed by a value and a colon.

3. The switch sentence can contain a default branch, which is usually the last branch of the switch sentence (can be at any position, but usually at the last one). When default is executed, the value of no case statement is equal to the variable value. The default branch does not require a break statement.

Example

Scanner in = new Scanner(System.in);
System.out.println("请输入当前月份");
int month = in.nextInt();
switch (month){
    case 1 :
        System.out.println("一月");break;
    case 2 :
        System.out.println("二月");break;
    case 3 :
        System.out.println("三月");break;
    case 4 :
        System.out.println("四月");break;
    case 5 :
        System.out.println("五月");break;
    case 6 :
        System.out.println("六月");break;
    case 7 :
        System.out.println("七月");break;
    case 8 :
        System.out.println("八月");break;
    case 9 :
        System.out.println("九月");break;
    case 10 :
        System.out.println("十月");break;
    case 11 :
        System.out.println("十一月");break;
    case 12 :
        System.out.println("十二月");break;
    default:
        System.out.println("错误的输入");break;
}

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