Java Foundation Classes extends Abstract Window ToolKit(AWT) and contains improved user interface called the Swing Components.
A container object is a component that can contain other Swing components. A container is responsible for laying the components that it contains. Commonly used containers are JFrame, JPanel andJScrollPane.
A component is placed on a user interface and can be made visible or resized. The commonly used components are JLabel, JTextField,JTextArea, JButton, JCheckBox, JRadioButton and JComboBox.
Java Program to demonstrate simple Swing
import javax.swing.*;
public class swg2 extends JFrame
{
public swg2()
{
setTitle("my swing application");
setSize(300, 200);
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
public static void main(String args[])
{
swg2 s=new swg2();
s.setVisible(true);
}
}
Java Swing Program to demonstrate GUI Controls [JTextField, JLabel and JButton]
import javax.swing.*;
import java.applet.*;
import java.awt.*;
/*<applet code=swingApp width=300 height=300> </applet> */
public class swingApp extends JApplet
{
JLabel l1,l2;
JTextField t1, t2;
JButton b1, b2;
public void init()
{
l1=new JLabel("Enter name");
l2=new JLabel("Enter Email");
t1=new JTextField(20);
t2=new JTextField(20);
b1=new JButton("OK");
b2=new JButton("Cancel");
setLayout(new FlowLayout());
add(l1); add(t1);add(l2); add(t2); add(b1); add(b2);
}
}
Java Program to show system time using “util” package
import java.util.*;
class Systime
{
public static void main(String args[])
{
Date d=new Date();
System.out.println(d.getHours() + ":"+ d.getMinutes() + ":" +
d.getSeconds());
}
}
