I'm trying to learn swing and work through the task we have been given. I can't see why the code doesn't display the JButtons in the SOUTH section as there is no issue when displaying the textfields, combobox and labels in the CENTER section.
I used the same format to add components to my CENTER section as I did in the SOUTH and EAST but only the center displays anything.
public class ProductListGUI{
JMenu menu;
JMenuItem about,importData,inventory,export;
ProductListGUI(){
JFrame f = new JFrame("Assignment 2");
JPanel p1 = new JPanel();
JList<String> list = new JList<>();
list.setBounds(600,0,200,600);
JScrollPane scrollPane = new JScrollPane(list,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
JPanel p3 = new JPanel();
p1.setLayout(null);
p1.setBounds(0,0,600,500);
p1.setBackground(new Color(230,230,230));
scrollPane.setLayout(null);
scrollPane.setBounds(600,0,200,500);
p3.setLayout(null);
p3.setBounds(0,500,800,100);
p3.setBackground(new Color(230,230,230));
JLabel l1,l2,l3,l4;
JTextField t1,t2,t3;
l1=new JLabel("ProductID");
l1.setBounds(10,100,200,30);
t1=new JTextField();
t1.setBounds(100,100,200,30);
l2=new JLabel("Name");
l2.setBounds(10,150,200,30);
t2=new JTextField();
t2.setBounds(100,150,200,30);
l3=new JLabel("Quantity");
l3.setBounds(10,250,200,30);
t3=new JTextField();
t3.setBounds(100,250,200,30);
p1.setBorder(BorderFactory.createTitledBorder("Product Details"));
JCheckBox checkBox = new JCheckBox("Available for Next Day Delivery");
checkBox.setBounds(10,300,250,50);
l4 = new JLabel("Item Type");
l4.setBounds(10,200,200,30);
String[] itemType = {"Select type","Homeware","Hobby","Garden"};
JComboBox dropdown = new JComboBox(itemType);
dropdown.setBounds(100,200,120,20);
p1.add(t1);p1.add(l1);p1.add(t2);p1.add(l2);p1.add(t3);p1.add(l3);p1.add(l4);p1.add(dropdown);p1.add(checkBox);
JButton b1 = new JButton("New Item");
b1.setBounds(200,550,80,20);
JButton b2 = new JButton("Save");
b2.setBounds(300,550,80,20);
JButton b3 = new JButton("Delete Selected");
b3.setBounds(600,550,80,20);
b3.setEnabled(false);
p3.add(b1);p3.add(b2);p3.add(b3);
JMenuBar mb = new JMenuBar();
menu = new JMenu("Actions");
about = new JMenuItem("About");
importData = new JMenuItem("Import Data");
inventory = new JMenuItem("Inventory");
export = new JMenuItem("Export to CSV");
menu.add(about);menu.add(importData);menu.add(inventory);menu.add(export);
mb.add(menu);
f.getContentPane().add(p1,BorderLayout.CENTER);
f.getContentPane().add(scrollPane,BorderLayout.EAST);
f.getContentPane().add(p3,BorderLayout.SOUTH);
f.setJMenuBar(mb);
f.setSize(800,600);
f.setLayout(new BorderLayout());
f.setVisible(true);
}
These code changes should help at least a little bit.
Things that had to change:
null (as per TG's comment) is not good.setBounds() methods for the buttons were removed.f.setLayout(new BorderLayout()); was moved to the top of the code where Components were being added to the JFrame before the layout was set.import javax.swing.*;
import java.awt.*;
public class ProductListGUI {
JMenu menu;
JMenuItem about,importData,inventory,export;
ProductListGUI(){
JFrame f = new JFrame("Assignment 2");
JPanel panel1 = new JPanel();
JList<String> list = new JList<>();
list.setBounds(600,0,200,600);
JScrollPane scrollPane = new JScrollPane(list,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
JPanel panel3 = new JPanel();
panel1.setBounds(0,0,600,500);
panel1.setBackground(new Color(230,230,230));
scrollPane.setBounds(600,0,200,500);
panel3.setBounds(0,0,800,100);
panel3.setBackground(new Color(230,230,230));
JLabel l1,l2,l3,l4;
JTextField t1,t2,t3;
l1=new JLabel("ProductID");
l1.setBounds(10,100,200,30);
t1=new JTextField();
t1.setBounds(100,100,200,30);
l2=new JLabel("Name");
l2.setBounds(10,150,200,30);
t2=new JTextField();
t2.setBounds(100,150,200,30);
l3=new JLabel("Quantity");
l3.setBounds(10,250,200,30);
t3=new JTextField();
t3.setBounds(100,250,200,30);
panel1.setBorder(BorderFactory.createTitledBorder("Product Details"));
JCheckBox checkBox = new JCheckBox("Available for Next Day Delivery");
checkBox.setBounds(10,300,250,50);
l4 = new JLabel("Item Type");
l4.setBounds(10,200,200,30);
String[] itemType = {"Select type","Homeware","Hobby","Garden"};
JComboBox dropdown = new JComboBox(itemType);
dropdown.setBounds(100,200,120,20);
panel1.add(t1);
panel1.add(l1);
panel1.add(t2);
panel1.add(l2);
panel1.add(t3);
panel1.add(l3);
panel1.add(l4);
panel1.add(dropdown);
panel1.add(checkBox);
JButton b1 = new JButton("New Item");
JButton b2 = new JButton("Save");
JButton b3 = new JButton("Delete Selected");
b3.setEnabled(false);
panel3.add(b1);
panel3.add(b2);
panel3.add(b3);
JMenuBar mb = new JMenuBar();
menu = new JMenu("Actions");
about = new JMenuItem("About");
importData = new JMenuItem("Import Data");
inventory = new JMenuItem("Inventory");
export = new JMenuItem("Export to CSV");
menu.add(about);
menu.add(importData);
menu.add(inventory);
menu.add(export);
mb.add(menu);
f.setLayout(new BorderLayout());
f.getContentPane().add(panel1,BorderLayout.CENTER);
f.getContentPane().add(scrollPane,BorderLayout.EAST);
f.getContentPane().add(panel3,BorderLayout.SOUTH);
f.setJMenuBar(mb);
f.setSize(800,600);
f.setVisible(true);
}
public static void main(String[] args) {
ProductListGUI gui = new ProductListGUI();
}
}
Here is a very simple BorderLayout example that might help in the future, or not.
import javax.swing.*;
import java.awt.*;
public class TestGui {
public static void main(String[] args) {
JFrame frame = new JFrame("Test Frame");
frame.setLayout(new BorderLayout());
frame.setSize(800,600);
frame.getContentPane().add(createJPanel("CENTER", Color.RED), BorderLayout.CENTER);
frame.getContentPane().add(createJPanel("NORTH", Color.CYAN), BorderLayout.NORTH);
frame.getContentPane().add(createJPanel("EAST", Color.LIGHT_GRAY), BorderLayout.EAST);
frame.getContentPane().add(createJPanel("SOUTH", Color.GREEN), BorderLayout.SOUTH);
frame.getContentPane().add(createJPanel("WEST", Color.YELLOW), BorderLayout.WEST);
frame.setVisible(true);
}
private static JPanel createJPanel(String title, Color color) {
JPanel jPanel = new JPanel();
jPanel.setLayout(new BorderLayout());
jPanel.add(new JLabel(title), BorderLayout.CENTER);
jPanel.setBackground(color);
return jPanel;
}
}