debug7_1.java

北京大学出版社的

package questions.c7;
public class Debug7_1 implements Cloneable {
   StringBuffer sb
      = new StringBuffer( "Sales Report for " );
   public Debug7_1 clone()
              throws CloneNotSupportedException {
      Debug7_1 result = super.clone();
      result.sb
         = new StringBuffer( this.sb.toString() );
      return result;
   }
   public static void main( String[] args )
              throws CloneNotSupportedException {
      Debug7_1 x = new Debug7_1();
      Debug7_1 y = x.clone();
      x.sb.append( "October" );
      System.out.println( y.sb );
   }
}