java - 如何在 JAVA 中使用内部逻辑创建自定义注释

Question

我想创建一个注释，它搜索以注释中给出的单词开头的方法名称并执行此方法。

我是注释新手，我知道有一些内置注释，例如：

@override, @suppressWarnigs, @documented, @Retention, @deprecated, @target

有没有更多的注释？

Answer 1

I am sure there are good guides there but here is a fast one, forgive me for any typos :).

You can create your own annotation easily:

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface ExecuteMethod {
 String methodToExecute();
}

You can annotate your method with it.

@ExecuteMethod(methodToExecute = "MethodToExecute")
...

The code linked to the annotation looks like this:

public class MethodExecutor{
 private Method method;

 public MethodExecutor(Method method){
   this.method = method;
 }

 public boolean executeMethod(){
        if(method.isAnnotationPresent(ExecuteMethod.class)){
            ExecuteMethod executeMethodAnnot=method.getAnnotation(ExecuteMethod.class);
            String methodName = executeMethodAnnot.methodToExecute();
            .... your code that calls the method here
        }
 }

You also need a piece of code to check and execute this annotation at the point you want it done:

for(Method m : classToCheck.getMethods()) {
   if(m.isAnnotationPresent(ExecuteMethod.class)) {
       MethodExecturor methorExectuor = new MethodExecutor(m);
       methodExecutor.executeMethod(m)
    }
}