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 程式師世界 >> 編程語言 >> JAVA編程 >> JAVA編程入門知識 >> Java關於克隆與“冷藏”和“解凍”方法

Java關於克隆與“冷藏”和“解凍”方法

編輯:JAVA編程入門知識

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

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

  /**
   * 克隆測試<br>
   * 以方形類為例,比較了深克隆(deep clone)與淺克隆(shallow clone)的異同
   *
   * @see #clone()
   * @author 88250
   * @version 1.0.0, 2007-8-26
   */
  public class CloneTester
  {
      private Square square = new Square();

      private Square cpySquare = null;

      /**
       * 淺克隆操作
       */
      public void shallowClone()
      {
      square.setSideLength(2);
      square.setLocation(new Point(2, 5));
      // 淺克隆
      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();
      }
      }

      /**
       * 克隆結果輸出
       */
      public void cloneDisplay()
      {

      System.out.println("原始方形長度:" + square.getSideLength());
      System.out.println("克隆方形長度:" + 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
      {
      // 首先將對象寫到流裡
      ByteArrayOutputStream bo = new ByteArrayOutputStream();
      ObjectOutputStream oo = new ObjectOutputStream(bo);
      oo.writeObject(this);
     
      // 然後將對象從流裡讀出來
      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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