Point Class Help....Testing for invalid input
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Thread: Point Class Help....Testing for invalid input

  1. #1
    Join Date
    Jun 2014
    Location
    drjava-20120818-r5686
    Posts
    1

    Point Class Help....Testing for invalid input

    My program should allow the user to enter in the x-coordinate and y-coordinate to set a point. I created a method to test for invalid input using the hasNextInt() method. I know i should be using a looping structure of some sort to repeatedly ask the user for an integer if they type something in that is invalid such as a character. How can I implement this method so that it stores the users x value that they enter? Am i on the right track?
    // TEST DRIVER
    import java.io.*;
    import java.util.*;
    public class Lab4 {
    public static void main (String [] args) {
    Scanner input = new Scanner(System.in);
    Point p1 = new Point();
    Point p2 = new Point(7,13);
    Point p3 = new Point(7,15);
    //declare variables
    int x, y, z;

    System.out.println(p1.toString());
    System.out.println(p2.toString());
    System.out.println(p3.toString());

    if (p2.isVertical(p3) == true){
    System.out.println("Second point " + p2 + " Lines up vertically with third point " + p3);
    }else {
    System.out.println("The points do not line up vertically ");
    }

    if (p2.isHorizontal(p3) == true){
    System.out.println("Second point " + p2 + "Lines up horizontally with third point " + p3);
    }else {
    System.out.println("The points do not line up horizontally ");
    }
    System.out.println();
    System.out.println("Enter the x-coordinate for the first point: "); // this is where I'm stuck


    }// end main
    }



    //point class

    import java.util.*;
    public class Point {
    Scanner input = new Scanner(System.in);
    private int x; // to store variables for x & y
    private int y;
    private int z;


    //default constructor
    public Point () {
    x = 0;
    y = 0;
    z = 0;
    }

    //alternate constructor
    public Point (int x1, int y1) {
    x = x1;
    y = y1;
    z = 0;
    }

    //alternate constructor
    public Point (int x1, int y1, int z1) {
    x = x1;
    y = y1;
    z = z1;
    }

    //set coordinates
    public void setCoord (int x1, int y1){
    x = x1;
    y = y1;
    }
    //set coordinates
    public void setCoord (int x1, int y1, int z1){
    x = x1;
    y = y1;
    z = z1;
    }
    public String toString() {
    return "x = " + x + ", y = " + y + ", z = " + z ;
    }

    //print method
    public void print (int x, int y) {
    System.out.println(x + "," + y);

    }

    //toString Method
    public String toString1() {
    return "First Point is " + x + ", " + y + ")";
    }
    public String toString2() {
    return "Second Point is " + x + ", " + y + ")";
    }
    public String toString3() {
    return "Third Point is " + x + ", " + y + ")";
    }

    public int getX() {
    return x;
    }

    public int getY() {
    return y;
    }

    public int getZ() {
    return z;
    }

    public void equals (Point p2) { // calles like if (p1.equals(p2))
    if ((x==p2.getX()) && (y==p2.getY()) && (z==p2.getZ()))
    System.out.println(" Coordinates are the same ");
    else {
    System.out.println(" Coordinates are different ");
    }
    }

    public void copy(Point temp) {
    x=temp.x;
    y=temp.y;
    }

    public Point getCopy() {
    Point temp = new Point();
    temp.x = x;
    temp.y = y;

    return temp;
    }
    public boolean invalidInput(Point p){ //checks for integer input
    if(!input.hasNextInt()){
    System.out.println("Not an integer! Try again! Enter the x- coordinate for first point: ");
    return true;
    }else{
    return false;
    }
    }


    public void distanceFromOrigin(int x1, int y1) {
    double dx = x-x1;
    double dy = y-y1;
    }

    public void distance (int x1, int y1) {
    double distance = Math.sqrt((x * x1) + (y * y1));
    }

    public void transform (int dx, int dy) {
    x += dx;
    y += dy;
    }

    public boolean isHorizontal (Point otherPoint) {
    if (y == otherPoint.y) {

    return true;
    } else {
    return false;
    }
    }

    public boolean isVertical (Point otherPoint ) {
    if (x == otherPoint.x) {
    return true;

    } else {
    return false;
    }
    }

    public double slope(int dx, int dy) {
    int slope;

    slope = (dy/dx);
    return slope;
    }
    }

  2. #2
    Join Date
    Jun 1999
    Location
    SW Missouri
    Posts
    3,449

    Re: Point Class Help....Testing for invalid input

    Please edit your post and wrap your code with code tags:
    [code]
    YOUR CODE GOES HERE
    [/code]
    to get highlighting and preserve formatting.
    Norm

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