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Thread: [Beginner Java] Returning a variable from mothod problem

  1. #1
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    Post [Beginner Java] Returning a variable from mothod problem

    So, I've tried to learn how to use methods so I dont have to use the same script to handle something in vain. But
    what I'm having problems with is returning a variable.

    package javagametest;
    import javax.swing.SwingUtilities;
    import javax.swing.JFrame;
    import javax.swing.JPanel;
    import java.awt.Dimension;
    import java.awt.Graphics;
    import java.awt.Color;
     
     
     
     
     
     
    public class JavaGameTest{
     
        public static void main(String[] args){
     
            SwingUtilities.invokeLater(new Runnable(){
     
                @Override
                public void run(){
                    createAndShowGUI();
                }
     
            });
     
        }
     
        public static void createAndShowGUI(){
     
            JFrame f = new JFrame("JFrame test");
            f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            f.add(new myPanel());
            f.pack();
            f.setVisible(true);
     
     
        }
     
    }
     
    class myPanel extends JPanel{
     
        //Global
        static int Room_Width = 966;
        static int Room_Height = 600;
     
        //The red box variables
        private double RedBoxX = (int) (Math.random() * 640);
        private double RedBoxY = (int) (Math.random() * 480);
        private int RedBoxW = 32;
        private int RedBoxH = 32;
        private int RedBoxVert = 1;
        private int RedBoxHoro = 1;
        private double RedBoxSpeed = 0.3;
     
     
        public myPanel(){
     
     
     
     
     
     
        }
     
     
        private void MoveObject(){
     
                switch (RedBoxVert)
                {
                    case 0: RedBoxY-=RedBoxSpeed;
                        break;
                    case 1: RedBoxY+=RedBoxSpeed;
                        break;
                }
     
                switch (RedBoxHoro)
                {
                    case 0: RedBoxX-=RedBoxSpeed;
                        break;
                    case 1: RedBoxX+=RedBoxSpeed;
                        break;
                }
     
     
            }
     
     
        static int checkCollisionHOROSONTAL(double x, double y, int horo, int width){
     
                    if ((x + width >= Room_Width))
                    {horo = 0;}
     
                    if ((x  <= 0))
                    {horo = 1;}
     
                    return horo;
     
                }
     
     
                static int checkCollisionVertical(double x, double y, int vert1, int height){
     
                    if ((x + height >= Room_Height))
                    {vert1 = 0;}
     
                    if ((x  <= 0))
                    vert1 = 1;
     
                    return vert1;
     
                }
     
     
     
     
     
     
     
     
        @Override
        public Dimension getPreferredSize(){
            return new Dimension(Room_Width,Room_Height);
        }
     
     
     
     
     
     
        @Override
        public void paintComponent(Graphics g){
     
            super.paintComponent(g);
            {
             super.paintComponent(g);
                    MoveObject();
                    checkCollisionHOROSONTAL(RedBoxX, RedBoxY, RedBoxHoro, RedBoxW);
                    checkCollisionVertical(RedBoxX, RedBoxY, RedBoxVert, RedBoxH);
     
                    int RedBoxXINT = (int)RedBoxX;
                    int RedBoxYINT = (int)RedBoxY;
     
             g.setColor(Color.RED);
             g.fillRect(RedBoxXINT, RedBoxYINT, RedBoxW, RedBoxH);
             g.setColor(Color.BLACK);
             g.drawRect(RedBoxXINT, RedBoxYINT, RedBoxW, RedBoxH);
     
     
             repaint();
     
            }
     
        }
     
     
    }


    I want the "Return vart1" to indicate if the variable RedBoxVert should be on or off (as you can see in the paramaters " checkCollisionVertical(RedBoxX, RedBoxY, RedBoxVert, RedBoxH);" ), but it's not working.

    I've also tryed to use public int instead of static int, but I have no clue on what I should do.

    I would really appreciate if someone could help!


  2. #2
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    Default Re: [Beginner Java] Returning a variable from mothod problem

    It should be returning just fine. But to me it looks like you are not storing that value that is returned and using it.

    int myInt = myFunction();

    Regards,

    Chris
    chris[at]javaprogrammingforums[dot]com

    Prifysgol Bangor University, North Wales

  3. The Following User Says Thank You to Freaky Chris For This Useful Post:

    kinkita (May 8th, 2013)

  4. #3
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    Default Re: [Beginner Java] Returning a variable from mothod problem

    Ah, now it's working, thank you. I also had to fix a few missplaced variables

    static int checkCollisionHOROSONTAL(double x, double y, int horo, int width){

    if ((x + width >= Room_Width))
    {horo = 0;}

    if ((x <= 0))
    {horo = 1;}

    return horo;

    }


    static int checkCollisionVertical(double x, double y, int vert1, int height){

    if ((x + height >= Room_Height))
    {vert1 = 0;}

    if ((x <= 0))
    vert1 = 1;

    return vert1;

    }
    but now it works, thanks!

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