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Thread: GUI errors

  1. #1
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    Default GUI errors

    I have been trying to figure out these errors and I am stuck. You guys are good at seeing what I can not, thanks!

    import javax.swing.*;
    import java.awt.*;
    import java.awt.event.*;
     
    public class GUIWindow extends JFrame{
     
    	//private Circle circ = new Circle();
     
    private JLabel radiusLabel            = new JLabel("Radius");
    private JLabel areaLabel              = new JLabel("Area");
    private TextField radiusField          = new JTextField("3.14");
    private TextField areaField            = new JTextField("0.0");
    private JButton radButton             = new JButton("Convert >>>");
     
     public GUIWindow(){
       JPanel dataPanel = new JPanel(new GridLayout(2,2,12,6));
       dataPanel.add(radiusLabel);
       dataPanel.add(areaLabel);
       dataPanel.add(radiusField);
       dataPanel.add(areaField);
       JPanel buttonPanel                  = new JPanel();
       buttonPanel.add(radButton);
       Container container = getContentPane();
       container.add(dataPanel, BorderLayout.CENTER);
       container.add(buttonPanel, BorderLayout.SOUTH);
     
       radButton.addActionListener(new RadiusListener());
     }
     
     private class RadiusListener implements ActionListener{
        public void actionPerformed(ActionEvent e){
     
           String input = radiusField.getText();
           double rad = Double.parseDouble(input);
           rad.setRadius(rad);
           double area = rad.getArea();
           areaField.setText("" + area);
           }
           }
           }

    the errors:

    E:\JavaCh8SR\ConvertWithGUI.java:10: cannot find symbol
    symbol : method setVisable(boolean)
    location: class GUIWindow
    theGUI.setVisable(true);
    ^
    .\GUIWindow.java:11: incompatible types
    found : javax.swing.JTextField
    required: java.awt.TextField
    private TextField radiusField = new JTextField("3.14");
    ^
    .\GUIWindow.java:12: incompatible types
    found : javax.swing.JTextField
    required: java.awt.TextField
    private TextField areaField = new JTextField("0.0");
    ^
    .\GUIWindow.java:35: double cannot be dereferenced
    rad.setRadius(rad);
    ^
    .\GUIWindow.java:36: double cannot be dereferenced
    double area = rad.getArea();
    ^


    and the main:
    import javax.swing.*;
     
    public class ConvertWithGUI{
     
    public static void main(String[] args){
    GUIWindow theGUI = new GUIWindow();
    theGUI.setTitle("Radius Converter");
    theGUI.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    theGUI.pack();
    theGUI.setVisable(true);
    }
    }


  2. #2
    Crazy Cat Lady KevinWorkman's Avatar
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    Default Re: GUI errors

    Those exceptions tell you what's wrong.

    In the first one, your variable theGUI (or the instance it references) does not have a setVisable() method. Did you perhaps mean setVisible()?
    In both the incompatible types, you're just trying to use the wrong kind of variable to store the instance.
    And double is a primitive, not an Object. So it doesn't contain any methods.
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