Design and implementation of rational class of rational number class in Java

To realize the subtraction of rational class, it is to realize its comparability, to overwrite the ToString () method, to realize the conversion of different data types, etc.

1  PackageChapter14;2 3  Public classRationalextendsNumberImplementsComparable {4     Private LongNumerator=0;5     Private LongDenominator=1;6     7      PublicRational () {8          This(0,1);9     }Ten      PublicRational (LongNumerator,Longdenominator) { One         //TODO auto-generated Constructor stub A         LongGcd=gcd (numerator,denominator); -          This. numerator= ((denominator>0)? 1:-1) *numerator/gcd; -          This. Denominator=math.abs (Denominator)/gcd; the     } -  -     Private Static LonggcdLongNLongd) { -         //TODO auto-generated Method Stub +         Longn1=Math.Abs (n); -         LongN2=Math.Abs (d); +         intGcd=1; A          at          for(intk=1;k<=n1&&k<=n2;k++){ -             if(n1%k==0&&n2%k==0) -Gcd=K; -         } -         returngcd; -     } in      -      Public LongGetnumerator () { to         returnnumerator; +     } -      Public LongGetdenominator () { the         returndenominator; *     } $     Panax Notoginseng      PublicRational Add (rational secondrational) { -         LongN=numerator*secondrational.getdenominator () + thedenominator*secondrational.getnumerator (); +         Longd=denominator*secondrational.getdenominator (); A         return NewRational (n,d); the     } +      -      PublicRational Subtract (rational secondrational) { $         LongN=numerator*secondrational.getdenominator ()- $denominator*secondrational.getnumerator (); -         Longd=denominator*secondrational.getdenominator (); -         return NewRational (n,d); the     } -     Wuyi      PublicRational Multiply (rational SR) { the         Longn=numerator*sr.getnumerator (); -         Longd=denominator*sr.getdenominator (); Wu         return NewRational (n,d); -     } About      $      Publicrational Divide (rational SR) { -         Longn=numerator*Sr.denominator; -         Longd=denominator*Sr.numerator; -         return NewRational (n,d); A     } +      the      PublicString toString () { -         if(denominator==1) $             returnNumerator+ ""; the         Else the             returnnumerator+ "/" +denominator; the     } the      -      Public Booleanequals (Object parm1) { in         if(( This. Subtract (Rational) (Parm1)). Getnumerator () ==0) the             return true; the         Else  About             return false; the     } the      the      +      - @Override the      Public intcompareTo (Object o) {Bayi         //TODO auto-generated Method Stub the         if(( This. Subtract (Rational) o). Getnumerator () >0) the                 return1; -         Else if(( This. Subtract (Rational) o). Getnumerator () <0) -             return-1; the         Else the             return0; the     } the  - @Override the      Public intintvalue () { the         //TODO auto-generated Method Stub the         return(int) Doublevalue ();94     } the  the @Override the      Public LongLongvalue () {98         //TODO auto-generated Method Stub About         return(Long) Doublevalue (); -     }101 102 @Override103      Public floatFloatvalue () {104         //TODO auto-generated Method Stub the         return(float) Doublevalue ();106     }107 108 @Override109      Public DoubleDoublevalue () { the         //TODO auto-generated Method Stub111         returnnumerator*1.0/denominator; the     }113  the  the      the 117}

Rational numbers are encapsulated in rational objects. Within the machine, the rational number is always expressed as its simplest form, the numerator determines the symbol of the rational number, and the denominator is always positive.

The GCD () method is private static.

The ToString method and the Equals method in the object class are overridden in the rational class. The ToString () method returns a string representation of a rational object in the form of Numerator/denominator.

　　

Design and implementation of rational class of rational number class in Java