Thread: Need help with debugging

Any of my methods from Triangle with parameters don't work with their calls in TriangleDriver. I get an error:
method validSides cannot be applied to given types;
required: int, int, int found : no arguments; reason: actual and formal argument lists differ in length

Triangle

import java.util.Scanner;
 
public class Triangle {
 
    private int a, b, c;
 
    public Triangle() {
 
        a = 0;
        b = 0;
        c = 0;
    }
 
    public String  toString(int sideA, int sideB, int sideC) {
 
        return sideA + " " + sideB + " " + sideC;
    }
 
    public boolean validSides(int sideA, int sideB, int sideC) {
 
        boolean valid = true;
        if (sideA < 0 || sideB < 0 || sideC < 0)
            valid = false;
 
        return valid;
    }
 
    public void setSides() {
        Scanner keyboard = new Scanner(System.in);
 
        System.out.println("Enter three integers to form a triangle:  ");
        a = keyboard.nextInt();
        b = keyboard.nextInt();
        c = keyboard.nextInt();
 
    }
 
    public boolean displayType(int sideA, int sideB, int sideC) {
 
        boolean validTriangle = true;
        if ( sideA + sideB <= sideC ) {
            System.out.println("Triangle Type: DOES NOT FORM TRIANGLE");
            validTriangle = false;
        }
        else if ( sideA ==  sideB && sideB == sideC) 
            System.out.println("Triangle Type: EQUILATERAL");
        else if ( sideA ==  sideB)
            System.out.println("Triangle Type: ISOSCELES");
        else
            System.out.println("Triangle Type: SCALENE");
 
        return validTriangle;
    }
 
    public int getPerimeter(int sideA, int sideB, int sideC) {
 
        int perimeter = sideA + sideB + sideC;
 
        return perimeter;
    }
 
    private void sortSides(int a, int b, int c) {
        int swap;
        if ( a > b) {
            swap = a;
            a = b;
            b = swap;
        }
 
        if ( a > c) {
            swap = a;
            a = c;
            c = swap;
        }
 
        if ( b > c ) {
            swap = b;
            b = c;
            c = swap;
        }
    }
}

TriangleDriver

/** Description: This program will continually get three integers from a user to 
 *               represent the three sides of a triangle. They are displayed in
 *               sorted order.  It is determined whether the three integers 
 *               don't form a triangle and if they do, whether it's equilateral, 
 *               isosceles, or scalene.  If the triangle is valid, its perimeter
 *               is displayed.         
 *  Filename:    TriangleDriver.java
 *  Project:     Assignment 5
 *  Author:      Joey Benitez
 *  Due Date:    11/06/2013
*/
 
import java.util.Scanner;
 
public class TriangleDriver {
 
    public static void main (String[] args) {
 
        Triangle theTriangle = new Triangle();
        Scanner keyboard = new Scanner(System.in);
        String playAgain;
        String sortedSides;
        boolean validEntries;
        boolean validTriangle;
 
        // Continue as long as the user wants to enter Triangle sides 
        do {
            theTriangle.setSides();
            validEntries = theTriangle.validSides();
            if ( validEntries ) {
                theTriangle.sortSides();
                sortedSides = theTriangle.toString();
                System.out.println("Sides sorted:  " + sortedSides);
                validTriangle = theTriangle.displayType();
                if ( validTriangle ) {
                    System.out.println("Perimeter:  " + 
                            theTriangle.getPerimeter());
                }
            }
            else {
                System.out.println("INVALID ENTRY FOR SIDES"); 
            }
 
            System.out.println();
            System.out.print("Would you like to enter more triangles?  ");
            playAgain = keyboard.next();
            System.out.println();
 
        } while (playAgain.toUpperCase().startsWith("Y"));
 
        System.out.println("Program Completed");
   }
}

Your Object Orientation is a little off in the Triangle class. You should accept the three sides as parameters for the constructor and set the members:

public Triangle(int sideA, int sideB, int sideC) {
    a = sideA;
    b = sideB;
    c = sideC;
}

Now the other methods of Triangle can use the a, b & c and you can create instances of a triangle in your loop with:

Triangle t = new Triangle(2, 3, 4);