英文:
How to have enum with a value of type Method
问题
我想要在数据类型和方法名之间建立映射关系。对于特定的数据类型，将调用不同的方法。因此，我想以枚举的形式存储这些信息。您可以如何实现呢？例如，对于 CHECKBOX 类型，我想要调用一个名为 checkboxsimilarity 的方法，应该如何在下面的结构中存储和访问呢？
public enum MethodNames {
CHECHBOX(Method.checkboxsimilarity);
private final Method method;
private MethodNames(Method method) {
this.method = method;
}
public Method getMethod() {
return method;
}
}
英文:
I want to have a mapping between datatype and the methodname. As for a particular datatype a different method would be called. So, I want to store that in form of enum. How can I achieve it. For example for CHECKBOX type I want to call a method with the name checkboxsimilaity, how should I store store and access in the structure below.
public enum MethodNames{
//CHECHBOX with the value checkboxsimilaity (of type method)
public final Method name;
}
答案1
得分: 0
你可以尝试使用函数式接口将某些功能与枚举值关联起来：
public enum ElementType {
CHECKBOX(() -> {
System.out.println("在此处选择复选框或调用所需方法");
return "已选";
}),
TEXT_FIELD(() -> {
System.out.println("在文本字段中输入内容或调用所需方法");
return "已输入";
});
private Supplier<String> action;
ElementType(Supplier<String> action) {
this.action = action;
}
public String executeAssociatedAction() {
return action.get();
}
}
你可以在那里几乎做任何你想做的事情。调用将会是：
public static void main(String[] args) {
ElementType.CHECKBOX.executeAssociatedAction();
}
或者，你也可以在其他地方实现方法，让枚举带有一个字符串参数（即方法名），然后使用反射从相应类中调用具有相应名称的方法。
英文:
You may try to use functional interfaces to associate some functionality with enum values:
public enum ElementType {
CHECKBOX(() -> {
System.out.println("Select checkbox here or call needed method");
return "selected";
}),
TEXT_FIELD(() -> {
System.out.println("Type something into text field or call needed method");
return "typed";
});
private Supplier<String> action;
ElementType(Supplier<String> action) {
this.action = action;
}
public String executeAssociatedAction() {
return action.get();
}
}
And you can do almost whatever you want there.
The invoking will than be:
public static void main(String[] args) {
ElementType.CHECKBOX.executeAssociatedAction();
}
Alternatively, you can have methods implemented somewhere else, have enum with a string as a parameter (which will be the method name) and use reflection to call a method with the corresponding name from the corresponding class.
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