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Thread: swapping integers OOP

  1. #1
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    Default swapping integers OOP

    so my class has ust begun oop. We are asked to make a class called Swapper with two integer instances variables x, y and a constructor with two parameters that inirtialize the parameters. Also three methods a getX that returns x a getY that returns y and a void swap that swaps the values of x and y then create a SwapperDemo class that tests all methods. Im stuck and having problems grasping how to send between two filrs and all that.

    here is what I got:

    public class Swapper {
    int X;
    int Y;
     
     
    public Swapper(int i, int j) {
    	// TODO Auto-generated constructor stub
    }
    int getX(){
    return X;
    }
    int getY(){
    	return Y;
    }
    void swap(){
        int temp;
        temp = this.X;
        this.X = this.Y;
        this.Y = this.X;
    }
    }

     
    class DemoSwap {
    public static void main (String[] args){
    	Swapper x = new Swapper(9, 8);
    	Swapper y = new Swapper(7, 0);
     
    	System.out.println(x.X);
    }
    }
    im obviously way off but not sure how this all works.

    --- Update ---

    so i think this works does this look right?
     
    public class Swapper {
    int X;
    int Y;
     
     
    public Swapper(int i, int j) {
    	X=i;
    	Y=j;
    	// TODO Auto-generated constructor stub
    }
    int getX(){
     
    return X;
    }
    int getY(){
    	return Y;
    }
    void swap(){
        int temp;
        temp = this.X;
        this.X = this.Y;
        this.Y = this.X;
    }
    }
     
    class DemoSwap {
    public static void main (String[] args){
    	Swapper tempZ = new Swapper(9,5);
     
     
    	System.out.println("The value of X is "+tempZ.X);
    	System.out.println("The value of Y is "+tempZ.Y);
    	System.out.println();
    	System.out.println("When the values are swapped ");
    	System.out.println();
    	System.out.println("The value of X is "+ tempZ.getY());
    	System.out.println("The value of Y is "+ tempZ.getX());
    }
    }


  2. #2
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    Default Re: swapping integers OOP

    Hi,
    In swap function
    temp = this.X;
    this.X = this.Y;
    this.Y = temp;

    and in the demoswap function the last two lines should display The value of X as tempZ.getX() and the value of Y as tempZ.getY()

    Hope this solves your problem.

  3. #3
    Super Moderator Norm's Avatar
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    Default Re: swapping integers OOP

    Where does the testing method call the swap() method?
    If you don't understand my answer, don't ignore it, ask a question.

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