constructor Rational in class Rational cannot be applied to the given types?

Question

So the gist of this program is to create a Rational class so that when you run it, a GUI input will come up and ask for a numerator and a denominator. It will then return the reduced fraction. But I keep getting this error message and I don't know why. Here's the program so far:

import javax.swing.JOptionPane;


public class lab8
{
public static void main (String args[])
{
    String strNbr1 = JOptionPane.showInputDialog("Enter Numerator ");
    String strNbr2 = JOptionPane.showInputDialog("Enter Denominator ");

    int num = Integer.parseInt(strNbr1);
    int den = Integer.parseInt(strNbr2);

    Rational r = new Rational(num,den);
    JOptionPane.showMessageDialog(null,r.getNum()+"/"+r.getDen()+" equals "+r.getDecimal());

    System.exit(0);
}
}



class Rational
{
private int num;
private int den;

public Rational()
{
    num = 0;
    den = 1;
}
public double getNum()
{
    return num;
}

public int getDen()
{
    return den;
}
 }

What is the exact error message? Which line of code is it referring to? — Oliver Charlesworth, Jan 19 '13 at 02:05
it is "constructor Rational in class Rational cannot be applied to the given types;" — user1991954, Jan 19 '13 at 02:07
The error message will refer to a particular line of code; which is it? — Oliver Charlesworth, Jan 19 '13 at 02:07
Simply modify your constructor signature to take in two integer arguments. Rational(int,int) — jaaw, Jan 19 '13 at 02:12

score 2 · Answer 1 · answered Jan 19 '13 at 02:08

You are trying to call a constructor that doesn't exist. Your class constructor asks for nothing:

public Rational()

while it should ask for 2 ints:

public Rational(int num, int den){
     this.num = num;
     this.den = den;
}

so you can pass both num and den to it as you are trying to do in

Rational r = new Rational(num,den);

constructor Rational in class Rational cannot be applied to the given types?

1 Answers1