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();
}
}

import java.awt.Point;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

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

/**
* 正方形
*
* @author 88250
* @version 1.0.0, 2007-8-26
*/
public class Square implements Cloneable, Serializable
{
private Point location = new Point(0, 0);

private float sideLength = 1F;

@Override
public Object clone()
{
Square tmp = null;
try
{
tmp = (Square) super.clone();
}
catch (CloneNotSupportedException cnse)
{
cnse.printStackTrace();
}
finally
{
return tmp;
}
}

/**
* 深克隆方法
* @return
*/
public Object deepClone()
throws IOException, OptionalDataException, ClassNotFoundException
{
// 首先将对象写到流里
ByteArrayOutputStream bo = new ByteArrayOutputStream();
ObjectOutputStream oo = new ObjectOutputStream(bo);
oo.writeObject(this);

// 然后将对象从流里读出来
ByteArrayInputStream bi = new ByteArrayInputStream(bo.toByteArray());
ObjectInputStream oi = new ObjectInputStream(bi);

return (oi.readObject());
}

/**
* @return the location
*/
public Point getLocation()
{
return location;
}

/**
* @param location the location to set
*/
public void setLocation(Point location)
{
this.location = location;
}

/**
* @return the sideLength
*/
public float getSideLength()
{
return sideLength;
}

/**
* @param sideLength the sideLength to set
*/
public void setSideLength(float sideLength)
{
this.sideLength = sideLength;
}

}

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