package com.wh.po;
public interface IComputer {
void add(int a,int b);
void sub(int a,int b);
void mul(int a,int b);
void div(int a,int b);
}
package com.wh.po;
public class Computer implements IComputer{
@Override
public void add(int a, int b) {
System.out.println(a+b);
}
@Override
public void sub(int a, int b) {
// TODO Auto-generated method stub
}
@Override
public void mul(int a, int b) {
// TODO Auto-generated method stub
}
@Override
public void div(int a, int b) {
// TODO Auto-generated method stub
}
}
package com.wh.po;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
public class ComputerProxy{
private IComputer computer;
public ComputerProxy(){}
public ComputerProxy(IComputer computer) {
this.computer = computer;
}
public IComputer getComputer(){
//加载类
ClassLoader classLoader=computer.getClass().getClassLoader();
//代理哪些接口
Class[] interfaces=new Class[]{IComputer.class};
//监听
InvocationHandler handler=new InvocationHandler(){
@Override
public Object invoke(Object arg0, Method method, Object[] args) throws Throwable {
Object result=null;
System.out.println("计算开始！");
result=method.invoke(computer,args);
System.out.println("计算结束！");
return result;
}
};
return (IComputer)Proxy.newProxyInstance(classLoader, interfaces,handler);
}
}
package com.wh.po;
public class Test {
public static void main(String[] args) {
IComputer c = new ComputerProxy(new Computer()).getComputer();
c.add(10, 5);
}
}