complete6_1.java

程序练习中包括书中实例程序代码和练习中要用到的代码,是压缩文件

package questions.c6;
public class Complete6_1 {
   private double volume = 100.0;
   public void setVolume( double newVolume )
                        throws NegativeValueException {
      if ( newVolume <= 0 ) {
         // can't have a negative volume
         throw
            new NegativeValueException( newVolume );
      } else {
         volume = newVolume;
      }
   }
   public double getVolume() {
      return volume;
   }
   public static void main( String[] args ) {
      Complete6_1 x = new Complete6_1();
      try {
         x.setVolume( 5.0 );
      } catch ( NegativeValueException nve ) {
         System.out.println( "Illegal volume: "
                             + nve.geErrorValue() );
      }
   }
}