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Thread: Please help me with my GUI!

  1. #1
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    Default Please help me with my GUI!

    Guys please help me on my program, this is a GUI java program, and I'm having problem every time I run it. It doesn't give me any output on every given I enter, it got an error always. This is a Confidence Interval of know variance, that's the title of my program.. I want it to give me an output every time I press the calculate button. Here's the code..

    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;
     
    public class MyProgram2 extends JFrame implements ActionListener{
        JLabel heading = new JLabel("Given:");
        JLabel sSize = new JLabel("Sample Size");
        JLabel sMean = new JLabel("Sample Mean");
        JLabel var = new JLabel("Variance"); 
        JLabel ConfInt = new JLabel("Confidence Interval");
        JLabel ans = new JLabel("Two sided");
     
        JTextField textA = new JTextField(7);
        JTextField textB = new JTextField(7);
        JTextField textC = new JTextField(7);
        JTextField textD = new JTextField(7);
        JTextField textE = new JTextField(7);
        JTextField textF = new JTextField(7);
        JTextField ConfInttext = new JTextField(7);
        JTextField resultA = new JTextField(7);
        JTextField resultB = new JTextField(7);
     
        JButton calculate = new JButton("Calculate");
     
        JPanel hedpanel = new JPanel();
        JPanel row1 = new JPanel();
        JPanel row2 = new JPanel();
        JPanel row3 = new JPanel();
        JPanel row4 = new JPanel();
        JPanel result = new JPanel();
        JPanel butpanel = new JPanel();
        double a;
        double b; 
        double c;
        double d;
        double e; 
        double f; 
        double g; 
        double finalans; 
        double h;
        double i; 
        double j;
        double k;
        double l;
        double m;
        double n;
        double finalans2;
     
        public MyProgram2(){
            setTitle("Confidence Interval of two Population Mean");
            resultA.setEditable(false);
            resultB.setEditable(false);
            setLayout(new FlowLayout());
     
            //Add component to Panel
     
            hedpanel.add(heading);
     
            row1.add(sSize);
            row1.add(textA);
            row1.add(textB);
     
            row2.add(sMean);
            row2.add(textC);
            row2.add(textD);
     
            row3.add(var);
            row3.add(textE);
            row3.add(textF);
            row4.add(ConfInt);
            row4.add(ConfInttext);
     
            result.add(ans);
            result.add(resultA);
            result.add(resultB);
     
            butpanel.add(calculate);
     
            //Frame
            add(hedpanel);
            add(row1);
            add(row2);
            add(row3);
            add(row4);
            add(result);
            add(calculate);      
     
            setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            calculate.addActionListener(this);
        }
            //the Application
            public void calcCIL(){
                finalans = (c-d)-g*Math.sqrt((Math.pow(e,2)/a)+(Math.pow(f,2)/b));
            }
            public void calcCIR(){
                finalans2 = (j-k)+n*Math.sqrt((Math.pow(l,2)/h)+(Math.pow(m,2)/i));
            }
            public void actionPerformed(ActionEvent evt){
                String userIn;
                userIn = textA.getText();
                a = Integer.parseInt(userIn);
                h = Integer.parseInt(userIn);
     
                userIn = textB.getText();
                b = Integer.parseInt(userIn);
                i = Integer.parseInt(userIn);
     
                userIn = textC.getText();
                c = Integer.parseInt(userIn);
                j = Integer.parseInt(userIn);
     
                userIn = textD.getText();
                d = Integer.parseInt(userIn);
                k = Integer.parseInt(userIn);
     
                userIn = textE.getText();
                e = Integer.parseInt(userIn);
                l = Integer.parseInt(userIn);
     
                userIn = textF.getText();
                f = Integer.parseInt(userIn);
                m = Integer.parseInt(userIn);
     
                userIn = ConfInt.getText();
                g = Integer.parseInt(userIn);
                n = Integer.parseInt(userIn);
     
                resultA.setText(finalans+"");
                repaint();
                calcCIL();
                resultB.setText(finalans2+"");
                repaint();
                calcCIR();
     
            }
            public static void main(String[] args){
                MyProgram2 prog = new MyProgram2();
                prog.setSize(350, 290);
                prog.setResizable(false);
                prog.setVisible(true);
     
            }
    }


  2. #2
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    Default Re: Please help me with my GUI!

    Hello decgaid06. Welcome to the Java Programming Forums.

    I have compiled this code and it runs fine. The issue is when the Calculate button is pressed.
    It looks like it is falling over with multiple java.lang.NumberFormatException's

    You need to look at

                String userIn;
                userIn = textA.getText();
                a = Integer.parseInt(userIn);
                h = Integer.parseInt(userIn);
     
                userIn = textB.getText();
                b = Integer.parseInt(userIn);
                i = Integer.parseInt(userIn);
     
                userIn = textC.getText();
                c = Integer.parseInt(userIn);
                j = Integer.parseInt(userIn);
     
                userIn = textD.getText();
                d = Integer.parseInt(userIn);
                k = Integer.parseInt(userIn);
     
                userIn = textE.getText();
                e = Integer.parseInt(userIn);
                l = Integer.parseInt(userIn);
     
                userIn = textF.getText();
                f = Integer.parseInt(userIn);
                m = Integer.parseInt(userIn);
     
                userIn = ConfInt.getText();
                g = Integer.parseInt(userIn);
                n = Integer.parseInt(userIn);
     
                resultA.setText(finalans+"");
                repaint();
                calcCIL();
                resultB.setText(finalans2+"");
                repaint();
                calcCIR();

    a, b, c, d, e... are all declared as double variables.

    I would try updating the code to:

                userIn = textA.getText();
                a = Double.parseDouble(userIn);
                h = Double.parseDouble(userIn);
    Please use [highlight=Java] code [/highlight] tags when posting your code.
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