JFC is short for Java Foundation Classes, which encompass a group of features for building graphical user interfaces (GUIs) and adding rich graphics functionality and interactivity to Java applications.

It is built on the top of AWT (Abstract Windowing Toolkit) API and entirely written in java.

 
import javax.swing.*;        
 
public class HelloWorldSwing {
    /**
     * Create the GUI and show it.  For thread safety,
     * this method should be invoked from the
     * event-dispatching thread.
     */
    private static void createAndShowGUI() {
        //Create and set up the window.
        JFrame frame = new JFrame("HelloWorldSwing");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 
        //Add the ubiquitous "Hello World" label.
        JLabel label = new JLabel("Hello World");
        frame.getContentPane().add(label);
 
        //Display the window.
        frame.pack();
        frame.setVisible(true);
    }
 
    public static void main(String[] args) {
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }
}

 
import javax.swing.*;  
public class FirstSwingExample {  
public static void main(String[] args) {  
JFrame f=new JFrame();//creating instance of JFrame  
          
JButton b=new JButton("click");//creating instance of JButton  
b.setBounds(130,100,100, 40);//x axis, y axis, width, height  
          
f.add(b);//adding button in JFrame  
          
f.setSize(400,500);//400 width and 500 height  
f.setLayout(null);//using no layout managers  
f.setVisible(true);//making the frame visible  
}  
}

We can also write all the codes of creating JFrame, JButton and method call inside the java constructor.

 
import javax.swing.*;  
public class Simple {  
JFrame f;  
Simple(){  
f=new JFrame();//creating instance of JFrame  
          
JButton b=new JButton("click");//creating instance of JButton  
b.setBounds(130,100,100, 40);  
          
f.add(b);//adding button in JFrame  
          
f.setSize(400,500);//400 width and 500 height  
f.setLayout(null);//using no layout managers  
f.setVisible(true);//making the frame visible  
}  
  
public static void main(String[] args) {  
new Simple();  
}  
}

We can also inherit the JFrame class, so there is no need to create the instance of JFrame class explicitly.

 
import javax.swing.*;  
public class Simple2 extends JFrame{//inheriting JFrame  
JFrame f;  
Simple2(){  
JButton b=new JButton("click");//create button  
b.setBounds(130,100,100, 40);  
          
add(b);//adding button on frame  
setSize(400,500);  
setLayout(null);  
setVisible(true);  
}  
public static void main(String[] args) {  
new Simple2();  
}}

The JButton class is used to create a labeled button that has platform independent implementation

void setText(String s) It is used to set specified text on button

String getText() It is used to return the text of the button.

void setEnabled(boolean b) It is used to enable or disable the button.

void setIcon(Icon b) It is used to set the specified Icon on the button.

Icon getIcon() It is used to get the Icon of the button.

void setMnemonic(int a) It is used to set the mnemonic on the button.

void addActionListener(ActionListener a) It is used to add the action listener to this object.

 
import javax.swing.*;    
public class ButtonExample {  
public static void main(String[] args) {  
    JFrame f=new JFrame("Button Example");  
    JButton b=new JButton("Click Here");  
    b.setBounds(50,100,95,30);  
    f.add(b);  
    f.setSize(400,400);  
    f.setLayout(null);  
    f.setVisible(true);   
}  
}

 
import java.awt.event.*;  
import javax.swing.*;    
public class ButtonExample {  
public static void main(String[] args) {  
    JFrame f=new JFrame("Button Example");  
    final JTextField tf=new JTextField();  
    tf.setBounds(50,50, 150,20);  
    JButton b=new JButton("Click Here");  
    b.setBounds(50,100,95,30);  
    b.addActionListener(new ActionListener(){  
public void actionPerformed(ActionEvent e){  
            tf.setText("Welcome to Javatpoint.");  
        }  
    });  
    f.add(b);f.add(tf);  
    f.setSize(400,400);  
    f.setLayout(null);  
    f.setVisible(true);   
}  
}

Java Swing

Java Swing