Rewrite the following program to create the same user interface. Instead of crea

Question

Rewrite the following program to create the same user interface. Instead of creating buttons and panels separately, define a class that extends the JPanel class. Place three buttons in your panel class and create two panels from the user-defined panel class.


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

public class LayoutDemo extends JFrame {
JPanel panelOne;
JPanel panelTwo;
JButton btnOne;
JButton btnTwo;
JButton btnThree;
JButton btnFour;
JButton btnFive;
JButton btnSix;

public LayoutDemo() {
setLayout(new FlowLayout());
panelOne = new JPanel();
panelTwo = new JPanel();
btnOne = new JButton("One");
btnTwo = new JButton("Two");
btnThree = new JButton("Three");
btnFour = new JButton("Four");
btnFive = new JButton("Five");
btnSix = new JButton("Six");
panelOne.setLayout(new FlowLayout());
panelTwo.setLayout(new FlowLayout());
panelOne.add(btnOne);
panelOne.add(btnTwo);
panelOne.add(btnThree);
panelTwo.add(btnFour);
panelTwo.add(btnFive);
panelTwo.add(btnSix);
add(panelOne);
add(panelTwo);
setTitle("FlowLayout Demonstration");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(new Dimension(230, 130));
show();
}

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

Explanation / Answer

try following " import javax.swing.*; import java.awt.*; import java.awt.event.*; import javax.swing.table.*; import java.util.*; import javax.swing.event.*; class netTable implements ActionListener, TableModelListener { JFrame frame; JTable table; Vector rows,columns; DefaultTableModel tabModel; JScrollPane scrollPane; JLabel lblMessage; JButton cmdLookup, cmdUpdatePlan; JPanel topPanel,mainPanel,buttonPanel; public static void main(String[] args) { netTable t=new netTable(); } netTable() { rows=new Vector(); columns= new Vector(); String[] columnNames = { "ID", "Client", "Plan", "Amount" }; addColumns(columnNames); tabModel=new DefaultTableModel(); tabModel.setDataVector(rows,columns); table = new JTable(tabModel); scrollPane= new JScrollPane(table);//ScrollPane table.setRowSelectionAllowed(false); table.getModel().addTableModelListener(this); topPanel = new JPanel(); lblMessage=new JLabel("Invoices to Update"); topPanel.add(lblMessage); buttonPanel=new JPanel(); cmdLookup=new JButton("Lookup"); cmdUpdatePlan = new JButton("Update Plan"); buttonPanel.add(cmdLookup); buttonPanel.add(cmdUpdatePlan); cmdLookup.addActionListener(this); cmdUpdatePlan.addActionListener(this); mainPanel=new JPanel(); frame=new JFrame("Update Table"); frame.setSize(500,500); frame.setExtendedState(JFrame.ICONIFIED); mainPanel.setLayout(new BorderLayout()); mainPanel.add(topPanel,BorderLayout.NORTH); mainPanel.add(buttonPanel,BorderLayout.CENTER); mainPanel.add(scrollPane,BorderLayout.SOUTH);; topPanel.setBackground(Color.gray); mainPanel.setBackground(Color.white); buttonPanel.setBackground(Color.white); table.getParent().setBackground(Color.black); frame.getContentPane().add(mainPanel); frame.addWindowListener(new WindowCloser()); frame.setVisible(true); } } "

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