Java enum枚举配合switch使用

Posted 2023-01-19

一看就懂，一写就忘

定义枚举

public enum TypeEnum 
    //
    type1(1, "水果"),
    type2(2, "蔬菜"),
    type3(3, "零食");;

    private final Integer code;
    private final String value;

    TypeEnum(Integer code, String value) 
        this.code = code;
        this.value = value;
    

    public Integer getCode() 
        return code;
    

    public String getValue() 
        return value;
    

    // 根据code返回枚举类型,主要在switch中使用
    public static TypeEnum getByCode(Integer code) 
        for (TypeEnum optionTypeEnum : values()) 
            if (optionTypeEnum.getCode().equals(code)) 
                return optionTypeEnum;
            
        
        return null;
    

test

@Test
    public void test()
        System.out.println(TypeEnum.getByCode(1).getValue());

        System.out.println(TypeEnum.type1.getCode() + "_" + TypeEnum.type1.getValue());
        System.out.println(TypeEnum.type2.getCode()+ "_" + TypeEnum.type2.getValue());
        System.out.println(TypeEnum.type3.getCode()+ "_" + TypeEnum.type3.getValue());

        switch (TypeEnum.getByCode(1))
            case type1:
                System.out.println("吃水果");break;
            case type2:
                System.out.println("吃蔬菜"); break;
            case type3:
                System.out.println("吃零食");break;
        
    

结果