Structural -- Proxy

--- Subject.java ---

package structural.proxy;

public interface Subject {

void sampleOperation();

}

--- RealSubject.java ---

package structural.proxy;

public class RealSubject implements Subject {

public void sampleOperation() {

}

}

--- Proxy.java ---

package structural.proxy;

public class Proxy implements Subject {

private RealSubject realSubject;

public void sampleOperation() {
realSubject.sampleOperation();
}

}