The Use of JTable in Swing

This article describes Java Swing and makes a frame containing three labels, three text fields and two buttons. When you enter the data and click on the add button, then click on the show button then a new frame is opened and the frame contains a table. And the table has three fields named Name, Roll No and Marks for better understanding.

Step 1: Import necessary packages

import javax.swing.*;// for uesing the swing coponet like JButton,JTextField JScrollPane etc
import java.awt.event.*;//for performing event handling
import javax.swing.table.*;// for creating a DefaultTableModel

Step 2: Define the data members of components to be used

JFrame fr1,fr2;
JScrollPane sb;
JTextField tfName,tfRollNo,tfMark;
JButton bAdd,bShow;
JTable tb;
DefaultTableModel model;
JLabel jl1,jl2,jl3,jl4;

Step 3: Create a frames object and set the layout to null.

fr1=new JFrame();
fr2=new JFrame();
fr1.setLayout(null);
fr2.setLayout(null);

Step 4: Create the Labels, Buttons and TextFields objects and call setBounds for them to set the position in the frame.

jl1=new JLabel("Ente Name");
jl2=new JLabel("Ente Roll No");
jl3=new JLabel("Ente Mark");
jl4=new JLabel("Your Data in Table Format");
jl1.setBounds(30,50,100,40);
jl2.setBounds(30,120,100,40);
jl3.setBounds(30,190,100,40);
jl4.setBounds(60,30,200,20);
tfName=new JTextField();
tfRollNo=new JTextField();
tfMark=new JTextField();
tfName.setBounds(250,50,100,40);
tfRollNo.setBounds(250,120,100,40);
tfMark.setBounds(250,190,100,40);
bAdd=new JButton("ADD");
bShow=new JButton("Show");
bAdd.setBounds(10,270,100,50);
bShow.setBounds(180,270,100,50);
tb=new JTable();
sb=new JScrollPane(tb);
sb.setBounds(30,60,150,100);

Step 5: Add the component to the appropriate frame.

fr1.add(tfName);
fr1.add(tfRollNo);
fr1.add(tfMark);
fr1.add(bAdd);
fr1.add(bShow);
fr1.add(jl1);
fr1.add(jl2);
fr1.add(jl3);
fr2.add(jl4);
fr2.add(sb);

Step 6: Attach the button to an appropriate Listener (that is called registration to source) and set the frame size.

bAdd.addActionListener(this);
bShow.addActionListener(this);
fr1.setSize(400,400);
fr2.setSize(300,300);
fr1.setVisible(true);

Step 7: Create the object DefaultTableModel and add the column with their name. And set the table model.

model=new DefaultTableModel();
model.addColumn("Name");
model.addColumn("RollNo");
model.addColumn("Mark");
tb.setModel(model);

Step 8: Write the code for the actionPerformed Method.

public void actionPerformed(ActionEvent ae)
{
if (ae.getSource() == bAdd)
{
String r[] = new String[5];
r[0] = tfName.getText();
r[1] = tfRollNo.getText();
r[2] = tfMark.getText();
tfName.setText("");
tfRollNo.setText("");
tfMark.setText("");
model.addRow(r);
}
if (ae.getSource() == bShow)
{
fr2.setVisible(true);
}
}

Step 9: Rest only the Action performed method all the things write with in a constructor so we need only create the object of my class with the main method.

Complete code