Java –比较枚举值

骑猪看日落 2023-02-15 05:05 19阅读 0赞

在Java中，可以使用`==`运算符比较Enum值。

## 1. Java枚举示例 ##

Language.java

package com.mkyong.java
    
    public enum Language {
        JAVA,
        PYTHON,
        NODE,
        NET,
        RUBY
    }

## 2.与==比较 ##

将枚举值与`==`运算符进行比较的示例。

Test.java

package com.mkyong.java
    
    public class Test {
    
        public static void main(String[] args) {
    
    		// Covert string to enum
            //Language enumObj = Language.valueOf("java".toUpperCase());
    
            Language enumObj = Language.JAVA;
    		
            if (enumObj == Language.JAVA) {
                System.out.println("Welcome Java");
            } else if (enumObj == Language.NET) {
                System.out.println("Welcome .Net");
            } else if (enumObj == Language.NODE) {
                System.out.println("Welcome Node JS");
            } else if (enumObj == Language.PYTHON) {
                System.out.println("Welcome Python");
            } else if (enumObj == Language.RUBY) {
                System.out.println("Welcome Ruby");
            } else {
                System.out.println("Hello World");
            }
    
        }
    
    }

输出量

Welcome Java

## 3.与开关比较 ##

另外，您可以将枚举值与`switch`语句进行比较。

Test.java

package com.mkyong.java
    
    public class Test {
    
        public static void main(String[] args) {
    
            Language enumObj = Language.PYTHON;
    
            switch (enumObj) {
                case JAVA:
                    System.out.println("Welcome Java");
                    break;
                case NET:
                    System.out.println("Welcome .Net");
                    break;
                case NODE:
                    System.out.println("Welcome Node JS");
                    break;
                case PYTHON:
                    System.out.println("Welcome Python");
                    break;
                case RUBY:
                    System.out.println("Welcome Ruby");
                    break;
                default:
                    System.out.println("Hello World");
                    break;
            }
    
        }
    
    }

输出量

Welcome Python

## 参考文献 ##

1.  [Oracle Doc –枚举类型][Oracle Doc]
2.  [Java –将字符串转换为枚举对象][Java]
3.  [Stackoverflow –比较Java枚举成员：==或等于（）][Stackoverflow _Java]

标签： [枚举][Link 1]

> 翻译自: [https://mkyong.com/java/java-compare-enum-value/][https_mkyong.com_java_java-compare-enum-value]

[Oracle Doc]: http://docs.oracle.com/javase/tutorial/java/javaOO/enum.html
[Java]: http://www.mkyong.com/java/java-convert-string-to-enum-object/
[Stackoverflow _Java]: http://stackoverflow.com/questions/1750435/comparing-java-enum-members-or-equals
[Link 1]: https://mkyong.com/tag/enum/
[https_mkyong.com_java_java-compare-enum-value]: https://mkyong.com/java/java-compare-enum-value/