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.*;
  4.  
  5. public class java2 extends JPanel {
  6.  
  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. java2.java:8: error: cannot find symbol
  2. setLayout(new Gridlayout(2,1));
  3. ^
  4. symbol: class Gridlayout
  5. location: class java2
  6. java2.java:9: error: cannot find symbol
  7. JList lista = new JList(java2.ids);
  8. ^
  9. symbol: variable ids
  10. location: class java2
  11. java2.java:10: error: cannot find symbol
  12. add(new JScrollpane(lista));
  13. ^
  14. symbol: class JScrollpane
  15. location: class java2
  16. java2.java:18: error: cannot find symbol
  17. java1 lista=new Java1();
  18. ^
  19. symbol: class java1
  20. location: class java2
  21. java2.java:18: error: cannot find symbol
  22. java1 lista=new Java1();
  23. ^
  24. symbol: class Java1
  25. location: class java2
  26. Note: java2.java uses unchecked or unsafe operations.
  27. Note: Recompile with -Xlint:unchecked for details.
  28. 5 errors
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