fraction.java

来自「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」· Java 代码 · 共 43 行

package examples.classes;

/** A class representing a fraction
  */
public class Fraction {

   private int num, den;

   public Fraction() {
      this( 0, 1 );
   }

   public Fraction( int initNum ) {
      this( initNum, 1 );
   }

   public Fraction( int initNum, int initDen ) {
      num = initNum;
      if ( 0 == initDen ) {
         initDen = 1;      // don't allow a zero
                           // denominator!
      }
      den = initDen;      
   }

   /** Convert the object to a string
     */
   public String toString() {
      return num + "/" + den;
   }

   /** Test method for the class
     * @param args not used
     */
   public static void main( String[] args ) {
      Fraction a = new Fraction();
      Fraction b = new Fraction( 2 );
      Fraction c = new Fraction( 3, 4 );
      System.out.println( a );
      System.out.println( b );
      System.out.println( c );
   }
}