Java根据枚举值获取枚举名称
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Java getting the Enum name given the Enum Value
提问by Julia
How can I get the name of a Java Enum type given its value?
给定值，如何获取 Java Enum 类型的名称？
I have the following code which works for a particularEnum type, can I make it more generic?
我有以下代码适用于特定的Enum 类型，我可以让它更通用吗？
public enum Category {
APPLE("3"),
ORANGE("1"),
private final String identifier;
private Category(String identifier) {
this.identifier = identifier;
}
public String toString() {
return identifier;
}
public static String getEnumNameForValue(Object value){
Category[] values = Category.values();
String enumValue = null;
for(Category eachValue : values) {
enumValue = eachValue.toString();
if (enumValue.equalsIgnoreCase(value)) {
return eachValue.name();
}
}
return enumValue;
}
}
回答by Riduidel
回答by prashant thakre
Try below code
试试下面的代码
public enum SalaryHeadMasterEnum {
BASIC_PAY("basic pay"),
MEDICAL_ALLOWANCE("Medical Allowance");
private String name;
private SalaryHeadMasterEnum(String stringVal) {
name=stringVal;
}
public String toString(){
return name;
}
public static String getEnumByString(String code){
for(SalaryHeadMasterEnum e : SalaryHeadMasterEnum.values()){
if(e.name.equals(code)) return e.name();
}
return null;
}
}
Now you can use below code to retrieve the Enum by Value
现在您可以使用以下代码按值检索枚举
SalaryHeadMasterEnum.getEnumByString("Basic Pay")
Use Below code to get ENUM as String
使用下面的代码将 ENUM 作为字符串
SalaryHeadMasterEnum.BASIC_PAY.name()
Use below code to get string Value for enum
使用下面的代码获取枚举的字符串值
SalaryHeadMasterEnum.BASIC_PAY.toString()
回答by Javaci
Try, the following code..
试试，下面的代码..
@Override
public String toString() {
return this.name();
}
回答by Do It
Here is the below code, it will return the Enum name from Enum value.
这是下面的代码，它将从 Enum 值返回 Enum 名称。
public enum Test {
PLUS("Plus One"), MINUS("MinusTwo"), TIMES("MultiplyByFour"), DIVIDE(
"DivideByZero");
private String operationName;
private Test(final String operationName) {
setOperationName(operationName);
}
public String getOperationName() {
return operationName;
}
public void setOperationName(final String operationName) {
this.operationName = operationName;
}
public static Test getOperationName(final String operationName) {
for (Test oprname : Test.values()) {
if (operationName.equals(oprname.toString())) {
return oprname;
}
}
return null;
}
@Override
public String toString() {
return operationName;
}
}
public class Main {
public static void main(String[] args) {
Test test = Test.getOperationName("Plus One");
switch (test) {
case PLUS:
System.out.println("Plus.....");
break;
case MINUS:
System.out.println("Minus.....");
break;
default:
System.out.println("Nothing..");
break;
}
}
}
回答by Ankit
In such cases, you can convert the values of enum to a List and stream through it. Something like below examples. I would recommend using filter().
在这种情况下，您可以将 enum 的值转换为 List 并通过它进行流式处理。类似于下面的例子。我建议使用filter()。
Using ForEach:
使用 ForEach：
List<Category> category = Arrays.asList(Category.values());
category.stream().forEach(eachCategory -> {
if(eachCategory.toString().equals("3")){
String name = eachCategory.name();
}
});
Or, using Filter:
或者，使用过滤器：
When you want to find with code:
当你想用代码查找时：
List<Category> categoryList = Arrays.asList(Category.values());
Category category = categoryList.stream().filter(eachCategory -> eachCategory.toString().equals("3")).findAny().orElse(null);
System.out.println(category.toString() + " " + category.name());
When you want to find with name:
当你想用名字查找时：
List<Category> categoryList = Arrays.asList(Category.values());
Category category = categoryList.stream().filter(eachCategory -> eachCategory.name().equals("Apple")).findAny().orElse(null);
System.out.println(category.toString() + " " + category.name());
Hope it helps! I know this is a very old post, but someone can get help.
希望能帮助到你！我知道这是一个很老的帖子，但有人可以得到帮助。
