如何在Java中使用枚举键值

huangapple
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英文:

How to use enum key value in java

问题

我想在Java 11中创建一个枚举类，具有键值对。

我创建了一个枚举类，如下所示：

  1. public enum Status {
  2.     ACTIVE("Active", 1), INACTIVE("Inactive", 2);
  4.     private final String key;
  5.     private final Integer value;
  7.     Status(String key, Integer value) {
  8.         this.key = key;
  9.         this.value = value;
  10.     }
  12.     public String getKey() {
  13.         return key;
  14.     }
  16.     public Integer getValue() {
  17.         return value;
  18.     }
  19. }

问题在于，当我执行 Status.values() 时，我得到了以下结果：

  1. [
  2. "ACTIVE",
  3. "INACTIVE"
  4. ]

但我想要得到如下结果：

  1. [
  2. {
  3. "Key": "Inactive",
  4. "value":"2"
  5. },
  6. {
  7. "Key": "Active",
  8. "value":"1"
  9. }
  10. ]

如何调用我的枚举类以获得这样的结果呢？

英文:

I want to create an enum class in java 11 with key value
I create a enum like this

  1. public enum status{
  3.     ACTIVE("Active", 1), IN_ACTIVE("In Active", 2);
  5.     private final String key;
  6.     private final Integer value;
  8.     Status(String key, Integer value) {
  9.         this.key = key;
  10.         this.value = value;
  11.     }
  13.     public String getKey() {
  14.         return key;
  15.     }
  16.     public Integer getValue() {
  17.         return value;
  18.     }
  19. }

the problem that when i do Saison saison.getvalues()
i got like this

  1. [
  2. "ACTIVE",
  3. "INACTIVE"
  4. ]

But i want to got like this

  1. [
  2. {
  3. "Key": "Inactive", 
  4. "value":"2"
  5. },
  6. {
  7. "Key": "Active",
  8.  "value":"1"
  9. }
  10. ]

how can i call my enum tio get a result like this

答案1

得分: 3

没有任何东西可以阻止你返回一个包含key,value键值对的映射项。

  1.  enum Status {
  3.     ACTIVE("Active", 1), IN_ACTIVE("In Active", 2);
  5.     private final String key;
  6.     private final int value;
  8.     Status(String key, int value) {
  9.         this.key = key;
  10.         this.value = value;
  11.     }
  13.     public String getKey() {
  14.         return key;
  15.     }
  16.     public int getValue() {
  17.         return value;
  18.     }
  19.     public Entry<String,Integer> getBoth() {
  20.     	return new AbstractMap.SimpleEntry<>(key, value);
  21.     }	
  22. }
  24. Entry<String,Integer> e = Status.ACTIVE.getBoth();
  25. System.out.println("Key: = " + e.getKey());
  26. System.out.println("Value: = " + e.getValue());

或者打印Entry的toString()值。

  1. System.out.println(e);

输出

  1. Key: = Active
  2. Value: = 1
  3. Active=1

你还可以重写Enum的toString方法，像这样做。

  1. public String toString() {
  2. 	return String.format("\"key\": \"%s\",\n\"value\": \"%s\"",
  3. 			getKey(), getValue());
  4. }
  6. System.out.println(Status.ACTIVE);

输出

  1. "key": "Active",
  2. "value": "1"
英文:

There is nothing to prevent you from returning a map entry which contains the key,value pair.

  1.  enum Status {
  3.     ACTIVE(&quot;Active&quot;, 1), IN_ACTIVE(&quot;In Active&quot;, 2);
  5.     private final String key;
  6.     private final int value;
  8.     Status(String key, int value) {
  9.         this.key = key;
  10.         this.value = value;
  11.     }
  13.     public String getKey() {
  14.         return key;
  15.     }
  16.     public int getValue() {
  17.         return value;
  18.     }
  19.     public Entry&lt;String,Integer&gt; getBoth() {
  20.     	return new AbstractMap.SimpleEntry&lt;&gt;(key, value);
  21.     }	
  22. }
  24. Entry&lt;String,Integer&gt; e = Status.ACTIVE.getBoth();
  25. System.out.println(&quot;Key: = &quot; + e.getKey());
  26. System.out.println(&quot;Value: = &quot; + e.getValue());

or print the toString() value of the Entry.

  1. System.out.println(e);
  2.

Prints

  1. Key: = Active
  2. Value: = 1
  3. Active=1

You can also override toString of your Enum and do something like this.

  1. public String toString() {
  2. 	return String.format(&quot;\&quot;key\&quot;: \&quot;%s\&quot;,%n\&quot;value\&quot;: \&quot;%s\&quot;&quot;,
  3. 			getKey(), getValue());
  4. }
  6. System.out.println(Status.ACTIVE);

Prints

  1. &quot;key&quot;: Active&quot;,
  2. &quot;value&quot;: &quot;1&quot;
  4. 	
  6. </details>
  10. # 答案2
  11. **得分**: 0
  13. ```java
  14. public enum FileCode {
  15.     AB("AB", "AB 描述"),
  16.     CD("CD", "CD 描述"),
  17.     EF("EF", "EF 描述");
  19.     private final String key;
  20.     private final String value;
  21.     private final KeyValue keyValue;
  23.     FileCode(String key, String value) {
  24.         this.key = key;
  25.         this.value = value;
  26.         this.keyValue = new KeyValue(key, value);
  27.     }
  29.     public static List<KeyValue> getAllKeyValue() {
  30.         List<KeyValue> keyValueList = new ArrayList<>();
  31.         for (FileCode f : FileCode.values()) {
  32.             keyValueList.add(KeyValue.builder()
  33.                     .key(f.key)
  34.                     .value(f.value)
  35.                     .build());
  36.         }
  37.         return keyValueList;
  38.     }
  40.     public Map.Entry<String, String> getBoth() {
  41.         return new AbstractMap.SimpleEntry<>(key, value);
  42.     }
  44.     @Data
  45.     @NoArgsConstructor
  46.     @AllArgsConstructor
  47.     @Builder
  48.     public static class KeyValue {
  49.         String key;
  50.         String value;
  51.     }
  52. }
英文:

I did in this way to return all key and value in list.

  1. public enum FileCode {
  2.     AB(&quot;AB&quot;, &quot;AB description&quot;),
  3.     CD(&quot;CD&quot;, &quot;CD description&quot;),
  4.     EF(&quot;EF&quot;, &quot;EF description&quot;);
  6.     private final String key;
  7.     private final String value;
  8.     private final KeyValue keyValue;
  10.     FileCode(String key, String value) {
  11.         this.key = key;
  12.         this.value = value;
  13.         this.keyValue = new KeyValue(key, value);
  14.     }
  16.     public static List&lt;KeyValue&gt; getAllKeyValue() {
  17.         List&lt;KeyValue&gt; keyValueList = new ArrayList&lt;&gt;();
  18.         for (FileCode f : FileCode.values()) {
  19.             keyValueList.add(KeyValue.builder()
  20.                     .key(f.key)
  21.                     .value(f.value)
  22.                     .build());
  23.         }
  24.         return keyValueList;
  26.     }
  28.     public Map.Entry&lt;String, String&gt; getBoth() {
  29.         return new AbstractMap.SimpleEntry&lt;&gt;(key, value);
  30.     }
  32.     @Data
  33.     @NoArgsConstructor
  34.     @AllArgsConstructor
  35.     @Builder
  36.     public static class KeyValue {
  37.         String key;
  38.         String value;
  40.     }
  42. }

huangapple
  • 本文由 发表于 2020年9月28日 21:57:57
  • 转载请务必保留本文链接：https://go.coder-hub.com/64103674.html
  • enumeration
  • java
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