Components appear only when mouse hovers over them

I created a JFrame with the Swing framework, in which I added a JButton that will display a form created on a JPanel on the frame.

I added the action listener on the button and it is displaying panel as I expected;

But the boxes of components like radio buttons and checkboxes cannot be seen.

They appear only when I hover mouse over them.

Look at the other option in radio button and checkboxes:

Here is the code:

package codes;

import java.awt.Color;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTextField;

public class JFrameBackground extends JFrame implements ActionListener
{

    
    private static final long serialVersionUID = 1L;
    
    
    JLabel l1,l2,l3,l4;
    JTextField t1;
    JButton b1;
    JRadioButton r1;
    JComboBox com1;
    JCheckBox chk1;
    
    JPanel p2;
    JButton b;
    
    

    public JFrameBackground() 
    {
        
        p2=new JPanel();
        p2.setLayout(null);
        p2.setBounds(250, 0, 400, 400);
        add(p2);
        
        
        l1 = new JLabel("Name:");
        l1.setBounds(100,10,70,30);
        p2.add(l1);
        
        t1 = new JTextField();
        t1.setBounds(100,50,70,30);
        p2.add(t1);
        
        l2 = new JLabel("Gender:");
        l2.setBounds(100,130,70,30);
        p2.add(l2);
        
        r1 = new JRadioButton("Male");
        r1.setBounds(100,150,70,30);
        p2.add(r1);
        
        r1 = new JRadioButton("Female");
        r1.setBounds(150,150,70,30);
        p2.add(r1);
        
        l3 = new JLabel("Course:");
        l3.setBounds(100,180,70,30);
        p2.add(l3);
        
        chk1= new JCheckBox("Bca");
        chk1.setBounds(100, 200, 70, 30);
        p2.add(chk1);
        
        chk1= new JCheckBox("BBA");
        chk1.setBounds(150, 200, 70, 30);
        p2.add(chk1);
        
        chk1= new JCheckBox("BCOM");
        chk1.setBounds(200, 200, 70, 30);
        p2.add(chk1);
        
        l4 = new JLabel("Country:");
        l4.setBounds(100,220,70,30);
        p2.add(l4);
        
        String name[] = {"India","USA","UK","Rus"};
        
        com1=new JComboBox(name);
        com1.setBounds(100, 250, 70, 30);
        p2.add(com1);
        
        b1= new JButton("Submit");
        b1.setBounds(140, 300, 90, 30);
        p2.add(b1);
        
        
        
        
        b =new JButton("Show form");
        b.setBounds(0, 4, 190, 40);
        b.setFocusPainted(false);
        b.setBorderPainted(false);
        b.addActionListener(this);
        add(b);
        
        b.addMouseListener(new MouseAdapter() 
        {
            public void mouseClicked(MouseEvent me)
            {
                
                p2.setVisible(true);
                
                
            }
        });
        
        
        
        Container c=getContentPane();
        c.setBackground(Color.gray);
        setBounds(170, 100, 1250, 500);
        
        setLayout(null);
        setVisible(true);
    }


    public static void main(String[] args) 
    {
        
        new JFrameBackground();
        

    }

    public void actionPerformed(ActionEvent arg0) 
    {
        
        
    }

}

Answer

This seems to work better.

  • I fixed radiobutton and checkbox positions.

  • I used different references for checkbox and radiobutton objects (r1, r2, chk1, chk2, chk3)

  • I added a buttongroup for radiobuttons.

     import java.awt.Color;
     import java.awt.Container;
     import java.awt.event.ActionEvent;
     import java.awt.event.ActionListener;
     import java.awt.event.MouseAdapter;
     import java.awt.event.MouseEvent;
    
     import javax.swing.JButton;
     import javax.swing.JCheckBox;
     import javax.swing.JComboBox;
     import javax.swing.JFrame;
     import javax.swing.JLabel;
     import javax.swing.JPanel;
     import javax.swing.JRadioButton;
     import javax.swing.JTextField;
    
     import javax.swing.ButtonGroup;
    
     public class JFrameBackground extends JFrame implements ActionListener
     {
    
    
         private static final long serialVersionUID = 1L;
    
    
         JLabel l1,l2,l3,l4;
         JTextField t1;
         JButton b1;
         JRadioButton r1, r2;
         JComboBox com1;
         JCheckBox chk1, chk2, chk3;
    
         JPanel p2;
         JButton b;
    
    
    
         public JFrameBackground() 
         {
    
             p2=new JPanel();
             p2.setLayout(null);
             p2.setBounds(250, 0, 400, 400);
             add(p2);
    
    
             l1 = new JLabel("Name:");
             l1.setBounds(100,10,70,30);
             p2.add(l1);
    
             t1 = new JTextField();
             t1.setBounds(100,50,70,30);
             p2.add(t1);
    
             l2 = new JLabel("Gender:");
             l2.setBounds(100,130,70,30);
             p2.add(l2);
    
             r1 = new JRadioButton("Male");
             r1.setBounds(100,150,70,30);
             p2.add(r1);
    
             r2 = new JRadioButton("Female");
             r2.setBounds(180,150,70,30);
             p2.add(r2);
    
             ButtonGroup bg=new ButtonGroup();    
             bg.add(r1);
             bg.add(r2); 
    
             l3 = new JLabel("Course:");
             l3.setBounds(100,180,70,30);
             p2.add(l3);
    
             chk1= new JCheckBox("Bca");
             chk1.setBounds(100, 200, 70, 30);
             p2.add(chk1);
    
             chk2= new JCheckBox("BBA");
             chk2.setBounds(180, 200, 70, 30);
             p2.add(chk2);
    
             chk3= new JCheckBox("BCOM");
             chk3.setBounds(260, 200, 70, 30);
             p2.add(chk3);
    
             l4 = new JLabel("Country:");
             l4.setBounds(100,220,70,30);
             p2.add(l4);
    
             String name[] = {"India","USA","UK","Rus"};
    
             com1=new JComboBox(name);
             com1.setBounds(100, 250, 70, 30);
             p2.add(com1);
    
             b1= new JButton("Submit");
             b1.setBounds(140, 300, 90, 30);
             p2.add(b1);
    
    
    
    
             b =new JButton("Show form");
             b.setBounds(0, 4, 190, 40);
             b.setFocusPainted(false);
             b.setBorderPainted(false);
             b.addActionListener(this);
             getContentPane().add(b);
    
             b.addMouseListener(new MouseAdapter() 
             {
                 public void mouseClicked(MouseEvent me)
                 {
    
                     p2.setVisible(true);
    
    
                 }
             });
    
    
    
             Container c=getContentPane();
             c.setBackground(Color.gray);
             setBounds(170, 100, 1250, 500);
    
             setLayout(null);
             setVisible(true);
         }
    
    
         public static void main(String[] args) 
         {
    
             new JFrameBackground();
    
    
         }
    
         public void actionPerformed(ActionEvent arg0) 
         {
    
    
         }
    
     }
    

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