Enum和Switch case的组合使用_switch case enum

要点：
1、先通过枚举的getEnumByType方法获取具体的枚举
2、case选项设置为具体枚举

Enum

package com.lhh.myspringboot.constant;


import lombok.Getter;
import java.util.Arrays;


@Getter
public enum DiscountModeEnum {

    ONE_PRICE(1,"描述1"),
    DISCOUNT(2,"描述2"),
    REDUCE(3,"描述3");


    private final Integer type;
    private final String desc;
    
    DiscountModeEnum(Integer type, String desc){
    this.type = type;
    this.desc = desc;
    }
    
    public static DiscountModeEnum getEnumByType(Integer type){
        if (type == null){
            return null;
        }
        return Arrays.stream(DiscountModeEnum.values())
                .filter(discountModeEnum -> discountModeEnum.type.equals(type))
                .findFirst().orElse(null);
    }
}


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调用

Integer type = 1;
// 1、先通过枚举的getEnumByType方法获取具体的枚举
DiscountModeEnum modeEnum = DiscountModeEnum.getEnumByType(type)
switch(modeEnum){
     // 2、case选项设置为具体枚举
    case ONE_PRICE: System.out.println("ONE_PRICE");  break;
    case DISCOUNT: System.out.println("DISCOUNT");  break;
    case REDUCE: System.out.println("REDUCE");  break;
    default:System.out.println("DEFAULT"); 
}
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