Java关于克隆与“冷藏”和“解冻”方法

import java.awt.Point;
import java.io.IOException;

import com.sun.corba.se.impl.io.OptionalDataException;

/**
 * 克隆测试<br>
 * 以方形类为例，比较了深克隆(deep clone)与浅克隆(shallow clone)的异同
 *
 * @see #clone()
 * @author 88250
 * @version 1.0.0, 2007-8-26
 */
public class CloneTester
{
    private Square square = new Square();

    private Square cpySquare = null;

    /**
     * 浅克隆操作
     */
    public void shallowClone()
    {
    square.setSideLength(2);
    square.setLocation(new Point(2, 5));
    // 浅克隆
    cpySquare = (Square) square.clone();

    }

    /**
     * 深克隆操作
     */
    public void deepClone()
    {
    square.setSideLength(3);
    square.setLocation(new Point(1, 3));
    // 深克隆
    try
    {
        cpySquare = (Square) square.deepClone();
    }
    catch (OptionalDataException e)
    {
        e.printStackTrace();
    }
    catch (IOException e)
    {
        e.printStackTrace();
    }
    catch (ClassNotFoundException e)
    {
        e.printStackTrace();
    }
    }

    /**
     * 克隆结果输出
     */
    public void cloneDisplay()
    {

    System.out.println("原始方形长度：" + square.getSideLength());
    System.out.println("克隆方形长度：" + cpySquare.getSideLength());

    System.out.println("原始方形==克隆方形?" + (square == cpySquare));

    System.out.println("原始方形的位置==克隆方形的位置?"
        + (square.getLocation() == cpySquare.getLocation()));
    }

    public static void main(String[] args)
    {
    CloneTester sm = new CloneTester();
    sm.shallowClone();
    sm.cloneDisplay();

    sm.deepClone();
    sm.cloneDisplay();
    }
}