Java 枚举数据转Map 查找 筛选

枚举类

public enum TestEnum {
    CODE_11("CODE_11","测试1"),
    CODE_22("CODE_22","测试2"),
    CODE_33("CODE_33","测试3"),
    CODE_44("CODE_44","测试4"),
    CODE_55("CODE_55","测试5"),
    ;
 
    private String code;
    private String name;
 
    TestEnum(String code, String name) {
        this.code = code;
        this.name = name;
    }
 
    public String getCode() {
        return code;
    }
 
    public String getName() {
        return name;
    }
}

1.获取所有枚举值，并转map

    public static void main(String[] args) {
        TestEnum[] values = TestEnum.values();
 
        Map<String, String> map = Arrays.stream(values).collect(Collectors.toMap(i -> i.getCode(), i -> i.getName()));
 
        System.out.println(map);
    }

控制台输出：

{CODE_55=测试5, CODE_44=测试4, CODE_33=测试3, CODE_22=测试2, CODE_11=测试1}

2.根据key排序

    public static void main(String[] args) {
        TestEnum[] values = TestEnum.values();
 
        Map<String, String> map = Arrays.stream(values)
                .collect(Collectors.toMap(i -> i.getCode(), i -> i.getName())).entrySet()
                .stream().sorted((e1, e2) -> e1.getKey().compareTo(e2.getKey()))
                .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue,(e1, e2) -> e1, LinkedHashMap::new));
 
        System.out.println(map);
    }

控制台输出：

{CODE_11=测试1, CODE_22=测试2, CODE_33=测试3, CODE_44=测试4, CODE_55=测试5}

3.查找

    public static void main(String[] args) {
        TestEnum[] values = TestEnum.values();
 
        Map<String, String> map = Arrays.stream(values)
                .collect(Collectors.toMap(i -> i.getCode(), i -> i.getName())).entrySet().stream()
                .filter(e ->e.getKey().equals("CODE_33"))
                .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue,(e1, e2) -> e1, LinkedHashMap::new));
 
        System.out.println(map);
    }

控制台输出：

{CODE_33=测试3}

4.模糊查询

    public static void main(String[] args) {
        TestEnum[] values = TestEnum.values();
 
        Map<String, String> map = Arrays.stream(values)
                .collect(Collectors.toMap(i -> i.getCode(), i -> i.getName())).entrySet().stream()
                .filter(e ->e.getKey().contains("2"))
                .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue,(e1, e2) -> e1, LinkedHashMap::new));
 
        System.out.println(map);
    }

控制台输出：

{CODE_33=测试3}