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这个是书上的例子,小菜鸟不懂还请大虾解释一下:
import java.lang.reflect.*;
import java.util.*;
public class ProxyTest
{
public static void main(String[] args)
{
Object[] elements = new Object[1000];
for(int i = 0; i < elements.length; i++)
{
Integer value = i + 1;
Class[] interfaces = value.getClass().getInterfaces();
InvocationHandler handler = new TraceHandler(value);
Object proxy = Proxy.newProxyInstance(null, interfaces, handler);
elements = proxy;
}
Integer key = new Random().nextInt(elements.length) + 1;
int result = Arrays.binarySearch(elements, key);
if(result >= 0)
System.out.println(elements[result]);
}
}
class TraceHandler implements InvocationHandler
{
public TraceHandler(Object t)
{
target = t;
}
public Object invoke(Object proxy, Method m, Object[] args) throws Throwable
{
System.out.print(target);
System.out.print("." + m.getName() + "(");
if(args != null)
{
for(int i = 0; i < args.length; i++)
{
System.out.print(args);
if(i < args.length - 1)
System.out.print(", ");
}
}
System.out.println(")");
return m.invoke(target, args);
}
private Object target;
} |
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