debug7_2.java

北京大学出版社的

package questions.c7;
class Debug7_2_Base {
   private int x;
   int getX() {
      return x;
   }
   public void setX( int newX ) {
      x = newX;
   }
}
public class Debug7_2 extends Debug7_2_Base
         implements Cloneable {
   StringBuffer sb
      = new StringBuffer( "Inventory count" );
   public Object clone()
            throws CloneNotSupportedException {
      Debug7_2 result = new Debug7_2();
      result.sb
         = new StringBuffer( this.sb.toString() );
      return result;
   }
   public static void main( String[] args )
         throws CloneNotSupportedException {
      Debug7_2 a = new Debug7_2();
      a.setX( 300 );
      Debug7_2 b = (Debug7_2) a.clone();
      System.out.println( b.sb + " " + b.getX() );
   }
}