基于接口实现java动态代理示例

subject.java

package _20140416_;

import java.util.list;

public interface subject {
   public string say(string name,int age);
   public list<person> getalllist(string name);
}

realsubject.java

package _20140416_;

import java.util.arraylist;
import java.util.list;

public class realsubject implements subject {

 private string name;

 public realsubject(string name) {
  this.name = name;
 }

 public string getname() {
  return name;
 }

 public void setname(string name) {
  this.name = name;
 }

 @override
 public string say(string name, int age) {
  return "名字:" + name + "_年龄:" + age;
 }

 @override
 public list<person> getalllist(string name) {
  list<person> list = new arraylist<person>();
  list.add(new person("a", 20));
  list.add(new person("b", 20));
  list.add(new person("c", 20));
  list.add(new person("d", 20));
  system.out.println(name);
  return list;
 }

 @override
 public int hashcode() {
  return 10010;
 }

 @override
 public boolean equals(object obj) {
  if(obj instanceof realsubject){
   realsubject real = (realsubject)obj;
   system.out.println("getname():"+real.getname());
   system.out.println("this.name:"+this.name);
   if(real.getname()==this.name){
     system.out.println("相同");
   }else{
    system.out.println("不相同");
   }
  }
  return true;
 }
}

myinvercationhander.java

package _20140416_;

import java.lang.reflect.invocationhandler;
import java.lang.reflect.method;
import java.lang.reflect.proxy;

public class myinvercationhander implements invocationhandler{

 private object obj;

 public object bind(object obj){
  this.obj=obj;
  return proxy.newproxyinstance(obj.getclass().getclassloader(),obj.getclass().getinterfaces(),this);
 }

 @override
 public object invoke(object proxy, method method, object[] args)
   throws throwable {
  object temp = method.invoke(this.obj, args);
  //这里做切面操作 比如我要加功能
  system.out.println("方法之前！");
  return temp;
 }

}

person.java

package _20140416_;

public class person {
 private string name;
 private int age;

 public string getname() {
  return name;
 }

 public void setname(string name) {
  this.name = name;
 }

 public int getage() {
  return age;
 }

 public void setage(int age) {
  this.age = age;
 }

 public person(string name, int age) {
  super();
  this.name = name;
  this.age = age;
 }

}

maintest.java

package _20140416_;

import java.util.hashmap;
import java.util.iterator;
import java.util.map;
import java.util.set;

public class maintest {
 public static void main(string[] args) {
      subject subject = (subject) new myinvercationhander().bind(new realsubject("中国"));
      system.out.println(subject.say("莫建锋",22));
      system.out.println(subject.getalllist("张三"));
      map<string,integer> mymap = new hashmap<string, integer>();
      mymap.put("a",1);
      mymap.put("b",2);
      mymap.put("c",3);
      mymap.put("d",4);
      mymap.put("e",5);
      set<map.entry<string,integer>> myentryset = mymap.entryset();
      iterator<map.entry<string,integer>> it = myentryset.iterator();
      while(it.hasnext()){
       map.entry<string,integer> entry = it.next();
       system.out.print(entry.getkey()+":");
       system.out.println(entry.getvalue());

      }
      system.out.println(new realsubject("中国").hashcode());
      system.out.println(new realsubject("中国").equals(new realsubject("中dd国")));
      string info = new string("1");
      string info1 = new string("1");
      system.out.println(new integer('1'));
      system.out.println(info.hashcode());
      system.out.println(info1.hashcode());
      system.out.println(info==info1);
      system.out.println(info.equals(info1));
      short i = 1;
      system.out.println(i);
 }
}