动态代理返回值的类型 - 黑马程序员技术交流社区

package com.heima;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.ArrayList;
import java.util.List;
public class Test6 {
public static void main(String[] args) throws Exception {
ArrayList<String> aList = new ArrayList<>();
MInvocationHandler h = new MInvocationHandler(aList);
List<String> list = (List) Proxy.newProxyInstance(aList.getClass().getClassLoader(),
aList.getClass().getInterfaces(), h);
Boolean b=list.add("Hello");
Integer size=list.size();
String s=list.get(0);
System.out.println(b);
System.out.println(size);
System.out.println(s.length());
}
}
class MInvocationHandler implements InvocationHandler {
private Object target;
public MInvocationHandler(Object target) {
this.target = target;
}
public Object invoke(Object obj, Method m, Object[] args) throws Throwable {
System.out.println("检查完毕！");
return m.invoke(target, args);
}
}

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