import java.lang.reflect.*;
import java.util.*;

class TraceHandler implements InvocationHandler{
    
    private Object target;
    
    public TraceHandler(Object target){
        this.target = target;
    }

    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
                
        System.out.print(target);
        System.out.print("." + method.getName() + "(");
        if(args != null){
            for (int i = 0; i < args.length; i++) {
                System.out.print(args[i]);
                if(i < args.length - 1)
                    System.out.print(", ");
            }
        }
        System.out.println(")");
        
        return method.invoke(target, args);         
        
    }
}

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;
            InvocationHandler handler = new TraceHandler(value);
            Object proxy = Proxy.newProxyInstance(null , new Class[] {Comparable.class}, handler);
            elements[i] = proxy;
        }
        
        Integer key = new Random().nextInt(elements.length) + 1;
        
        int result = Arrays.binarySearch(elements, key);
   
    }
    
}

Arrays.binarySearch(elements, key);

Arrays.sort(elements);

Exception in thread "main" java.lang.reflect.UndeclaredThrowableException
	at com.sun.proxy.$Proxy0.compareTo(Unknown Source)
	at java.util.ComparableTimSort.countRunAndMakeAscending(ComparableTimSort.java:320)
	at java.util.ComparableTimSort.sort(ComparableTimSort.java:202)

return -method.invoke(args[0],target); 

for(int i = 0; i < args.length; i++){
   Object arg = args[i];
   if(arg != null && Proxy.isProxyClass(arg.getClass()){
      TraceHandler handler = (TraceHandler) Proxy.getInvocationHandler(arg);     
      args[i] = handler.target;
   }
}

return method.invoke(target, args);  

Object proxy = Proxy.newProxyInstance(null , Class.forName("НеизвестныйЗаранееКласс").getInterfaces(), handler);