java中基本注解的知识点总结

@Override
public void onCreate(Bundle savedInstanceState)

{…….}

@Override
public void oncreate(Bundle savedInstanceState)
{…….}

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface RepeatMethod {

  int value() default 1;

}

public class Demo {
  @RepeatMethod(5)
  public void doSomeThing(){
    System.out.println("----注解测试----");
  }
}

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class MyDemo {
  public static void main(String[] args) throws IllegalAccessException, InstantiationException, InvocationTargetException {
    Class cla = Demo.class;
    Method[] methods = cla.getMethods();
    Object demo = cla.newInstance();
    for (Method method : methods){
      //判断方法上是否有标注@RepeatMethod注解
      if(method.isAnnotationPresent(RepeatMethod.class)){
        //获取RepeatMethod注解的参数值
        RepeatMethod repeatMethod = method.getAnnotation(RepeatMethod.class);
        for (int i = 0;i < repeatMethod.value(); i++)
        method.invoke(demo, null);
      }
    }
  }
}

----注解测试----
----注解测试----
----注解测试----
----注解测试----
----注解测试----