java 版钩子测试

package com.test;

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

public class TestHook {
static Method m = null;
/**
* @param args
* @throws NoSuchMethodException
* @throws SecurityException
* @throws InvocationTargetException
* @throws IllegalAccessException
* @throws IllegalArgumentException
*/
public static void main(String[] args) throws SecurityException, NoSuchMethodException, IllegalArgumentException, IllegalAccessException, InvocationTargetException {
// TODO Auto-generated method stub
regHook(TestHook.class.getMethod("max", int.class,int.class));
testhook(1,2);
unregHook();
testhook(1,2);
}

public static void regHook(Method n){
m = n;
}
public static void unregHook(){
m = null;
}
public static int max(int a ,int b){
return a>b?a:b;
}
public static int min(int a ,int b){
return a>b?b:a;
}
public static void testhook(int a,int b) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException{
if(m != null){
System.out.println(m.invoke(null,a,b));
}else{
System.out.println(a+b);
}

}

}