是否获取 Key检查 Key 是否存在返回对应的 Value抛出异常 publicenumMyEnum{KEY1("Value1"),KEY2("Value2");privatefinalStringvalue;MyEnum(Stringvalue){this.value=value;}publicstaticStringgetValueByKey(Stringkey){for(MyEnumenumValue
当然,我可以帮助你定义一个Java枚举类型,并根据key获取对应的value。下面是一个详细的解答,包括代码示例: 定义一个Java枚举类型: 首先,我们需要定义一个枚举类型,其中包含key和value属性。为了存储这些属性,我们可以使用枚举中的构造函数和字段。 java public enum MyEnum { ENUM_ONE("key1", "value1"), ENUM...
publicclassMain{publicstaticvoidmain(String[]args){String[]values=MyEnum.getValuesByKey("KEY");System.out.println(Arrays.toString(values));}} 1. 2. 3. 4. 5. 6. 运行该代码,将输出[Value1, Value2, Value3]。 总结 通过以上步骤,我们成功实现了Java枚举类根据给定的key获取相应的value数组。首先...
weekMap.put(EnumTest.TUE,"星期二");//... ...for(Iterator<Entry<EnumTest, String>> iter =weekMap.entrySet().iterator(); iter.hasNext();) { Entry<EnumTest, String> entry =iter.next(); System.out.println(entry.getKey().name()+ ":" +entry.getValue()); } } } 原理分析 enum ...
publicint getIndex() { return index; } publicvoid setIndex(int index) { this.index = index; } } 用法四:覆盖枚举的方法 下面给出一个toString()方法覆盖的例子。 publicenum Color { RED("红色",1), GREEN("绿色",2), BLANK("白色",3), YELLO("黄色",4); ...
valueOf(Class<T> enumType, String name):根据指定的枚举类型和名称,返回对应的枚举常量。 此外,Enum类还包含一些其他的保护方法,如clone()、finalize()和反序列化相关的方法。 需要注意的是,枚举类型在编译时会由编译器自动生成一些方法,如values()和valueOf(String)方法,用于获取枚举类型的所有常量和根据名称获...
protectedRouteFunction<String>getRouteFilter(TableAvailable table, Object shardingValue, ShardingOperatorEnum shardingOperator,booleanwithEntity){ LocalDateTime createTime = (LocalDateTime) shardingValue; String dataSource ="ds"+ createTime.getYear();switch(shardingOperator){caseGREATER_THAN:caseGREATER_THAN_...
Enum Enum Constructors Properties Methods Clone CompareTo Equals GetHashCode Name Ordinal ValueOf EnumConstantNotPresentException Error Exception ExceptionInInitializerError Float FunctionalInterfaceAttribute IAppendable IAppendableExtensions IAutoCloseable
The hash code of a string, enum, class, or annotation member-value v is computed as by calling v.hashCode(). (In the case of annotation member values, this is a recursive definition.) The hash code of an array member-value is computed by calling the appropriate overloading of java.uti...
Using the getValueByKey Method Now, let’s see how we can use thegetValueByKeymethod to retrieve the enum value by key: publicclassMain{publicstaticvoidmain(String[]args){Colorcolor=Color.getValueByKey("RED");System.out.println("Enum value: "+color);}} ...