Question

In Java:

Assume the existence of a Window class with int instance variables width, height, xPos and yPos.

Define the method toString for the Window class. The String representation of a Window object should be of the form "A 'width'x'height' window at ('xPos','yPos')" where the values within the apostrophes are replaced by the actual values of the corresponding instance variables.

For example, given a Window object whose width is 80, height is 20, xPos is 0 and yPos is 30, toString should return "A 80x20 window at (0,30)."

Answer 1

Below is your method:

/*
         * Define the method toString for the Window class. The String
         * representation of a Window object should be of the form
         * "A 'width'x'height' window at ('xPos','yPos')" where the values within
         * the apostrophes are replaced by the actual values of the corresponding
         * instance variables.
         */
        public String toString() {
                return "A " + width + "x" + height + " window at (" + xPos + "," + yPos
                                + ").";
        }

Here is your complete code:

public class Window {
        // instance variable
        private int width;
        private int height;
        private int xPos;
        private int yPos;

        // A constructor with paramters
        public Window(int width, int height, int xPos, int yPos) {
                this.width = width;
                this.height = height;
                this.xPos = xPos;
                this.yPos = yPos;
        }

        // default constructor
        public Window() {

        }

        // Getters and Setters
        public int getWidth() {
                return width;
        }

        public void setWidth(int width) {
                this.width = width;
        }

        public int getHeight() {
                return height;
        }

        public void setHeight(int height) {
                this.height = height;
        }

        public int getxPos() {
                return xPos;
        }

        public void setxPos(int xPos) {
                this.xPos = xPos;
        }

        public int getyPos() {
                return yPos;
        }

        public void setyPos(int yPos) {
                this.yPos = yPos;
        }

        /*
         * Define the method toString for the Window class. The String
         * representation of a Window object should be of the form
         * "A 'width'x'height' window at ('xPos','yPos')" where the values within
         * the apostrophes are replaced by the actual values of the corresponding
         * instance variables.
         */
        public String toString() {
                return "A " + width + "x" + height + " window at (" + xPos + "," + yPos
                                + ").";
        }

        // main method to test the program
        public static void main(String[] args) {
                // creating an object
                Window win = new Window(80, 20, 0, 30);
                // printing the object, it calls toString() internally
                System.out.println(win);
        }

}

Output

A 80x20 window at (0,30).