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Java关于克隆与“冷藏”和“解冻”方法

 2008-01-05 20:37:11 来源:WEB开发网   
核心提示: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(shal

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;
   }

}


Tags:Java 关于 克隆

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