使用枚举的方式代替if else

在需要做判断再进行逻辑操作的地方 例如：
需要记录用户在小程序点击事件的详情

如果用if else

		String name = "肆寒";
		String staff = "销售员";
		String content  = "";
		String actionCode = "6666";//前端传过来需要判断的code码
		if (actionCode.equals("1001")) {//查看名片
         content  = name +"查看了"+staff +"的名片";
        } else if (actionCode.equals("1002")) {//名片点赞
           content  = name +"点赞了"+staff +"的名片";
        } else if (actionCode.equals("1003")) {//名片取消点赞
          content  = name +"取消点赞"+staff +"的名片";
        }else if (...) {
         ...
        }

每有一个事件，就多一个判断，整个方法看上去满满都是if else
虽然处理起来简单粗暴，也省事，但是这么一看。。。如果actionCode = "6666"那不是得判断几千次

算了，直接说吧，如果使用枚举来遍历的话，至少逻辑层看上去就舒服多了

那么，你得先这样：

public interface CodeLog {
    String ACTION_CODE(String name,String staff);
}

然后你再这样

public enum ClickActionLogEnum implements CodeLog {

    ACTION_CODE_1001("1001") {
        @Override
        public String ACTION_CODE(String name,String staff) {
      		String content = name +"查看了"+staff +"的名片";
            return content;
        }
    },

    ACTION_CODE_1002("1002") {
        @Override
        public String ACTION_CODE(String name,String staff) {
            String content = name +"点赞了"+staff +"的名片";
            return content;
        }
    },...
    ;
    ClickActionLogEnum(String code) {
        this.setCode(code);
    }

    private String code;

    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }
    public static String getClickActionLogEnum(String code,String name,String staff){
        for (ClickActionLogEnum clickActionLogEnum:values()){
            if (clickActionLogEnum.getCode().equals(code)){
                return clickActionLogEnum.ACTION_CODE(name,staff);
            }
        }
        throw  new Exception("无效的动作编码");
    }
}

最后你再这样

	String name = "肆寒";
	String staff = "销售员";
	String actionCode = "6666";
	String content = ClickActionLogEnum.getClickActionLogEnum(actionCode,name,staff);

听明白了嘛？听明白了你就会发现如果我来个活动名称呢，如果我再来个商品名称呢，我不能一个个传吧？那就。。

@Data
public class ClickActionMessage{
    private String code;
    private String name;
    private String staff;
    private String productName;
	private String activityName;
}

public interface CodeLog {
    ClickActionMessage ACTION_CODE(ClickActionMessage clickActionMessage);
}


public enum ClickActionLogEnum implements CodeLog {

    ACTION_CODE_1001("1001") {
        @Override
        public String ACTION_CODE(String name,String staff) {
      		String content = name +"查看了"+staff +"的名片";
            return content;
        }
    },

    ACTION_CODE_1002("1002") {
        @Override
        public String ACTION_CODE(String name,String staff) {
            String content = name +"点赞了"+staff +"的名片";
            return content;
        }
    },...
    ;
    ClickActionLogEnum(String code) {
        this.setCode(code);
    }

    private String code;

    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }
    public static ClickActionMessage getClickActionLogEnum(ClickActionMessage clickActionMessage){
        for (ClickActionLogEnum clickActionLogEnum:values()){
            if (clickActionLogEnum.getCode().equals(clickActionMessage.getCode)){
                return clickActionLogEnum.ACTION_CODE(clickActionMessage);
            }
        }
        throw  new Exception("无效的动作编码");
    }
}

//逻辑层
actionMessage.setName("肆寒");
ClickActionMessage actionMessage = ClickActionLogEnum.getClickActionLogEnum(clickActionMessage);

第一次写，如有不对的地方欢迎指出我及时改正。