guava的map中value转换问题和排序问题

场景:一个枚举,我需要返回字典列表

  要求1:对枚举类型进行转化

  要求2:返回的值,根据 key 升序排列

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话不多说,直接撸代码

EnumTest.java 内容如下:

package com.lianjia.mls.support.web.controller;

import lombok.AllArgsConstructor;
import lombok.Getter;

import java.util.HashMap;
import java.util.Map;

@AllArgsConstructor
@Getter
public enum EnumTest {

    test_add_test("001", "字典1"),
    test_del_test("002", "字典2"),
    test003("003", "字典3"),
    test_update_test("006", "字典623"),
    test005("005", "字典523"),
    test004("004", "字典4"),
    test020("020", "字典20"),

    ;
    private String code;
    private String desc;

    private static final Map<String, EnumTest> allTypeMap = new HashMap<>();

    static {
        for (EnumTest enumTest : values()) {
            allTypeMap.put(enumTest.getCode(), enumTest);
        }
    }

    public static Map<String, EnumTest> getAllTypeWithMap() {
        return allTypeMap;
    }
}

TestMain.java

package com.lianjia.mls.support.web.controller;

import com.google.common.collect.ImmutableSortedMap;
import com.google.common.collect.Maps;

import java.util.Map;


public class TestMain {
    public static void main(String[] args) {

        //未排序
        Map<String, String> resultNoSort = Maps.transformValues(EnumTest.getAllTypeWithMap(), enumTest -> enumTest.getDesc());
        System.out.println(resultNoSort);

        //已排序
        Map<String, String> resultSorted = ImmutableSortedMap.<String, String>naturalOrder()
                .putAll(Maps.transformValues(EnumTest.getAllTypeWithMap(), enumTest -> enumTest.getDesc())).build();
        System.out.println(resultSorted);
    }
}

使用 guava 强大的功能,可以使代码变得更加简洁!!!

参考:http://www.91r.net/ask/4906961.html

Read the fucking manual and source code
原文地址:https://www.cnblogs.com/qxynotebook/p/9399121.html