Regarding for JComboBox in Java

[ankitdixit]

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:

import javax.swing.*;
        import java.awt.*;
        import java.awt.event.*;
 
        public class java2 extends JPanel {
 
            public java2 () {
                setLayout(new Gridlayout(2,1));
                JList lista = new JList(java2.ids);
                add(new JScrollpane(lista));
                JComboBox combo=new JComboBox();
                for (int i=0;i<100 ;i++ ) {
                    combo.addItem(Integer.toString(i));
                    add(combo);
                }
            }
        public static void main(String args[]) {
            java1 lista=new Java1();
            JFrame ventana=new JFrame();
            ventana.getContentPane().add(lista,BorderLayout.CENTER);
            ventana.addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent evt){System.exit(0);}});
            ventana.setSize(200,200);
            ventana.setVisible(true);
        }
        }

import javax.swing.*;
        import java.awt.*;
        import java.awt.event.*;

        public class java2 extends JPanel {

            public java2 () {
                setLayout(new Gridlayout(2,1));
                JList lista = new JList(java2.ids);
                add(new JScrollpane(lista));
                JComboBox combo=new JComboBox();
                for (int i=0;i<100 ;i++ ) {
                    combo.addItem(Integer.toString(i));
                    add(combo);
                }
            }
        public static void main(String args[]) {
            java1 lista=new Java1();
            JFrame ventana=new JFrame();
            ventana.getContentPane().add(lista,BorderLayout.CENTER);
            ventana.addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent evt){System.exit(0);}});
            ventana.setSize(200,200);
            ventana.setVisible(true);
        }
        }

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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?

java2.java:8: error: cannot find symbol
        setLayout(new Gridlayout(2,1));
                      ^
  symbol:   class Gridlayout
  location: class java2
java2.java:9: error: cannot find symbol
        JList lista = new JList(java2.ids);
                                     ^
  symbol:   variable ids
  location: class java2
java2.java:10: error: cannot find symbol
        add(new JScrollpane(lista));
                ^
  symbol:   class JScrollpane
  location: class java2
java2.java:18: error: cannot find symbol
    java1 lista=new Java1();
    ^
  symbol:   class java1
  location: class java2
java2.java:18: error: cannot find symbol
    java1 lista=new Java1();
                    ^
  symbol:   class Java1
  location: class java2
Note: java2.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
5 errors

java2.java:8: error: cannot find symbol
        setLayout(new Gridlayout(2,1));
                      ^
  symbol:   class Gridlayout
  location: class java2
java2.java:9: error: cannot find symbol
        JList lista = new JList(java2.ids);
                                     ^
  symbol:   variable ids
  location: class java2
java2.java:10: error: cannot find symbol
        add(new JScrollpane(lista));
                ^
  symbol:   class JScrollpane
  location: class java2
java2.java:18: error: cannot find symbol
    java1 lista=new Java1();
    ^
  symbol:   class java1
  location: class java2
java2.java:18: error: cannot find symbol
    java1 lista=new Java1();
                    ^
  symbol:   class Java1
  location: class java2
Note: java2.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
5 errors

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[d_stranz]

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.