java8中switch 整型int、string字符串、枚举用法

1.数字

  Integer type = 1;
        switch (type) {
            case 1:
                System.out.println(1);
                break;
            case 2:
                System.out.println(2);
                break;
            default:
                System.out.println("null");
        }

    System.out.println("null");
        }

2.枚举

public enum UserTypeEnum {

    one(1, "1"),
    two(2, "2"),
    three(3, "3");

    private long type;
    private String name;

    UserTypeEnum(int type, String name) {
        this.type = type;
        this.name = name;
    }

   

    public long getType() {
        return type;
    }

    public String getName() {
        return name;
    }

}

 

        UserTypeEnum userTypeEnum = null;

        switch (userTypeEnum) {
            case one:
                System.out.println(1);
                break;
            case two:
                System.out.println(2);
                break;
            case three:
                System.out.println(2);
                break;
            default:
                System.out.println("null");
        }

3.字符串

 

        String typeStr = "type1";
        switch (typeStr) {
            case "type1":
                System.out.println(1);
                break;
            case "type2":
                System.out.println(2);
                break;
            default:
                System.out.println("null");
        }

        

最后

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