How do I make a method that retirns a RationalNumber object represnting the addi

Question

How do I  make a method that retirns a RationalNumber object represnting the additive inverse (negative) of the calling RationalNumber object.

A toString method that returns a string representing the RationalNumber object in fraction form.

An asDecimal method that return the RationalNumber object as a double value.

Below is my program:

import java.util.*;
public class RationalNumber
{
    private int numerator=0;
    private int denominator=1;

    public RationalNumber(int numerator,int denominator)
    {
        boolean g=false;
        this.numerator=numerator;

        
        while (denominator==0){
            System.out.println("denominator cannot be 0 please enter a new value for denominator :");
            Scanner in =  new Scanner (System.in);
            denominator = in.nextInt();
        }
        this.denominator=denominator;
    }

    public  RationalNumber add(RationalNumber MyRationalNumber)
    {
        int numerator = this.numerator*MyRationalNumber.denominator + this.denominator*MyRationalNumber.numerator;
        int denominator = this.denominator*MyRationalNumber.denominator;
        return  new RationalNumber(numerator,denominator);
    }

    public  RationalNumber difference(RationalNumber MyRationalNumber)
    {
        int numerator = this.numerator*MyRationalNumber.denominator - denominator*MyRationalNumber.numerator;
        int denominator = this.denominator*MyRationalNumber.denominator;
        return new RationalNumber(numerator,denominator);
    }

    public  RationalNumber multiplies(RationalNumber MyRationalNumber)
    {
        int numerator = this.numerator*MyRationalNumber.numerator * this.denominator*MyRationalNumber.numerator;
        int denominator = this.denominator*MyRationalNumber.denominator;
        return new RationalNumber(numerator,denominator);
    }

    public  RationalNumber divide(RationalNumber MyRationalNumber)
    {
        int numerator = this.numerator*MyRationalNumber.numerator / this.denominator*MyRationalNumber.numerator;
        int denominator = this.denominator*MyRationalNumber.denominator;
        return new RationalNumber(numerator,denominator);
    }
    public RationalNumber reciprocal( )
    {
         int numerator = this.denominator;
        int denominator = this.numerator;
        return new RationalNumber(numerator,denominator);
    }
        

Explanation / Answer

import java.util.*;
public class RationalNumber
{
private int numerator=0;
private int denominator=1;

public RationalNumber(int numerator,int denominator)
{
boolean g=false;
this.numerator=numerator;


while (denominator==0){
System.out.println("denominator cannot be 0 please enter a new value for denominator :");
Scanner in = new Scanner (System.in);
denominator = in.nextInt();
}
this.denominator=denominator;
}

public String toString()
{
return numerator + " / " + denominator;
}
public RationalNumber add(RationalNumber MyRationalNumber)
{
int numerator = this.numerator*MyRationalNumber.denominator + this.denominator*MyRationalNumber.numerator;
int denominator = this.denominator*MyRationalNumber.denominator;
return new RationalNumber(numerator,denominator);
}

public RationalNumber additive_inverse()
{
return new RationalNumber(-numerator,denominator);
}
public double asDecimal()
{
return (double)numerator/(double)denominator;
}
public RationalNumber difference(RationalNumber MyRationalNumber)
{
int numerator = this.numerator*MyRationalNumber.denominator - denominator*MyRationalNumber.numerator;
int denominator = this.denominator*MyRationalNumber.denominator;
return new RationalNumber(numerator,denominator);
}

public RationalNumber multiplies(RationalNumber MyRationalNumber)
{
int numerator = this.numerator*MyRationalNumber.numerator * this.denominator*MyRationalNumber.numerator;
int denominator = this.denominator*MyRationalNumber.denominator;
return new RationalNumber(numerator,denominator);
}

public RationalNumber divide(RationalNumber MyRationalNumber)
{
int numerator = this.numerator*MyRationalNumber.numerator / this.denominator*MyRationalNumber.numerator;
int denominator = this.denominator*MyRationalNumber.denominator;
return new RationalNumber(numerator,denominator);
}
public RationalNumber reciprocal( )
{
int numerator = this.denominator;
int denominator = this.numerator;
return new RationalNumber(numerator,denominator);
}

public static void main(String[] args)
{
RationalNumber RN = new RationalNumber(4,5);
System.out.println(RN);
System.out.println("Its decimal value is " + RN.asDecimal());
System.out.println("Additive inverse is " + RN.additive_inverse());
System.out.println("Additive inverse deciaml is " + RN.additive_inverse().asDecimal());
}
}

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