Sample of Java Pattern -- Proxy

Order.java

package proxy;

import java.io.Serializable;
import java.util.Date;

public class Order implements Serializable {

    private int orderId;
    private String sku;
    private Date createdOn;
    private Date updatedOn;
    private int status;
    
    public int getOrderId() {
        return orderId;
    }
    public void setOrderId(int orderId) {
        this.orderId = orderId;
    }
    public String getSku() {
        return sku;
    }
    public void setSku(String sku) {
        this.sku = sku;
    }
    public Date getCreatedOn() {
        return createdOn;
    }
    public void setCreatedOn(Date createdOn) {
        this.createdOn = createdOn;
    }
    public Date getUpdatedOn() {
        return updatedOn;
    }
    public void setUpdatedOn(Date updatedOn) {
        this.updatedOn = updatedOn;
    }
    public int getStatus() {
        return status;
    }
    public void setStatus(int status) {
        this.status = status;
    }
    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((sku == null) ? 0 : sku.hashCode());
        return result;
    }
    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        Order other = (Order) obj;
        if (sku == null) {
            if (other.sku != null)
                return false;
        } else if (!sku.equals(other.sku))
            return false;
        return true;
    }
}

OrderDAO.java

package proxy;

import java.util.List;

public interface OrderDAO {
    public List<Order> getAllOrders();
}

OrderDAOImpl.java

package proxy;

import java.util.ArrayList;
import java.util.List;

public class OrderDAOImpl implements OrderDAO{
    public List<Order> getAllOrders(){
        List<Order> list = new ArrayList<Order>();
        for(int i =0; i<10; i++){
            Order order = new Order();
            order.setSku("sku"+i);
            list.add(order);
        }
        return list;
    }
}

OrderDAOProxy.java

package proxy;

import java.util.List;

public class OrderDAOProxy implements OrderDAO{
    public List<Order> getAllOrders(){
        long stTime = System.currentTimeMillis();
        OrderDAO orderDAOImpl = new OrderDAOImpl();
        List<Order> list = orderDAOImpl.getAllOrders();
        long endTime = System.currentTimeMillis();
        System.out.println("took " + (endTime - stTime) + " milliseconds.");
        return list;
    }
}

ProxyTest.java

package proxy;

public class ProxyTest {

    public static void main(String[] args) {
        OrderDAO orderDAOProxy = new OrderDAOProxy();
        orderDAOProxy.getAllOrders();
    }

}

you may download the source code.