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Thread: Regarding for JComboBox in Java

  1. #1

    Default Regarding for JComboBox in Java

    Hello Everyone, I am facing an error while working on a java project. I got the next simple program in Java, I got it online because I'm trying to learn Java programming but don't know how to fix it:

    Qt Code:
    1. import javax.swing.*;
    2. import java.awt.*;
    3. import java.awt.event.*;
    5. public class java2 extends JPanel {
    7. public java2 () {
    8. setLayout(new Gridlayout(2,1));
    9. JList lista = new JList(java2.ids);
    10. add(new JScrollpane(lista));
    11. JComboBox combo=new JComboBox();
    12. for (int i=0;i<100 ;i++ ) {
    13. combo.addItem(Integer.toString(i));
    14. add(combo);
    15. }
    16. }
    17. public static void main(String args[]) {
    18. java1 lista=new Java1();
    19. JFrame ventana=new JFrame();
    20. ventana.getContentPane().add(lista,BorderLayout.CENTER);
    21. ventana.addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent evt){System.exit(0);}});
    22. ventana.setSize(200,200);
    23. ventana.setVisible(true);
    24. }
    25. }
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    I'm getting the next problems every time I compile this program on Interviewbit, Can anyone suggest me? How to fix this?

    Qt Code:
    1. error: cannot find symbol
    2. setLayout(new Gridlayout(2,1));
    3. ^
    4. symbol: class Gridlayout
    5. location: class java2
    6. error: cannot find symbol
    7. JList lista = new JList(java2.ids);
    8. ^
    9. symbol: variable ids
    10. location: class java2
    11. error: cannot find symbol
    12. add(new JScrollpane(lista));
    13. ^
    14. symbol: class JScrollpane
    15. location: class java2
    16. error: cannot find symbol
    17. java1 lista=new Java1();
    18. ^
    19. symbol: class java1
    20. location: class java2
    21. error: cannot find symbol
    22. java1 lista=new Java1();
    23. ^
    24. symbol: class Java1
    25. location: class java2
    26. Note: uses unchecked or unsafe operations.
    27. Note: Recompile with -Xlint:unchecked for details.
    28. 5 errors
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  2. #2
    Join Date
    Jan 2008
    Alameda, CA, USA
    Thanked 864 Times in 851 Posts
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    Default Re: Regarding for JComboBox in Java

    Why are you posting a question about java, swing, and awt on a Qt forum? You should find a forum that is more relevant. "General Programming" does not mean any programming question. It still must be relevant to Qt.

    Your errors indicate you have not imported the files that contain the classes that the errors point to. It is also possible that your java installation does not contain the components you need and should be updated. Probably if you Google for the name of one of these classes, you will find out which imports are needed.
    <=== The Great Pumpkin says ===>
    Please use CODE tags when posting source code so it is more readable. Click "Go Advanced" and then the "#" icon to insert the tags. Paste your code between them.

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