Java Swing 

Java Swing tutorial is a part of Java Foundation Classes (JFC) that is used to create window-based applications. It is built on the top of AWT (Abstract Windowing Toolkit) API and entirely written in java.

Unlike AWT, Java Swing provides platform-independent and lightweight components.

The javax.swing package provides classes for java swing API such as JButton, JTextField, JTextArea, JRadioButton, JCheckbox, JMenu, JColorChooser etc.

Java Swing Examples

There are two ways to create a frame:

• By creating the object of Frame class (association)
• By extending Frame class (inheritance)

We can write the code of swing inside the main(), constructor or any other method.

---

Simple Java Swing Example

Let's see a simple swing example where we are creating one button and adding it on the JFrame object inside the main() method.

File: FirstSwingExample.java

1. import javax.swing.*;  
2. public class FirstSwingExample {  
3. public static void main(String[] args) {  
4. JFrame f=new JFrame();//creating instance of JFrame  
5.           
6. JButton b=new JButton("click");//creating instance of JButton  
7. b.setBounds(130,100,100, 40);//x axis, y axis, width, height  
8.           
9. f.add(b);//adding button in JFrame  
10.           
11. f.setSize(400,500);//400 width and 500 height  
12. f.setLayout(null);//using no layout managers  
13. f.setVisible(true);//making the frame visible  
14. }  
15. }  

.....

Example of Swing by Association inside constructor

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

File: Simple.java

1. import javax.swing.*;  
2. public class Simple {  
3. JFrame f;  
4. Simple(){  
5. f=new JFrame();//creating instance of JFrame  
6.           
7. JButton b=new JButton("click");//creating instance of JButton  
8. b.setBounds(130,100,100, 40);  
9.           
10. f.add(b);//adding button in JFrame  
11.           
12. f.setSize(400,500);//400 width and 500 height  
13. f.setLayout(null);//using no layout managers  
14. f.setVisible(true);//making the frame visible  
15. }  
16.   
17. public static void main(String[] args) {  
18. new Simple();  
19. }  
20. }  

The setBounds(int xaxis, int yaxis, int width, int height)is used in the above example that sets the position of the button.

---

Simple example of Swing by inheritance

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

File: Simple2.java

1. import javax.swing.*;  
2. public class Simple2 extends JFrame{//inheriting JFrame  
3. JFrame f;  
4. Simple2(){  
5. JButton b=new JButton("click");//create button  
6. b.setBounds(130,100,100, 40);  
7.           
8. add(b);//adding button on frame  
9. setSize(400,500);  
10. setLayout(null);  
11. setVisible(true);  
12. }  
13. public static void main(String[] args) {  
14. new Simple2();  
15. }}  

....

Java Swing Example  with Event Handling :-

import javax.swing.*;

import java.awt.event.*;

 

public class Main

 {

    public static void main(String[] args) 

{

        JFrame frame=new JFrame("Button Click Example");

        final JTextField text_field=new JTextField();       //JTextField object

        text_field.setBounds(50,100, 150,20);

        JButton click_button=new JButton("Click Me!!!");    //JButton object

        click_button.setBounds(20,50,75,30);

        click_button.addActionListener(new ActionListener()

{    //add an event and take action

            public void actionPerformed(ActionEvent e){

                text_field.setText("You Clicked the button");

            }

        });

         

//add button and textfield to the frame

        frame.add(click_button);frame.add(text_field);

        frame.setSize(400,400);

        frame.setLayout(null);

        frame.setVisible(true);

    }

}

output:-

Another example of Java Swing with addition and subtraction example  :-

import javax.swing.*;  

import java.awt.event.*;  

public class TextFieldExample implements ActionListener{  

    JTextField tf1,tf2,tf3;  

    JButton b1,b2;  

    TextFieldExample(){  

        JFrame f= new JFrame();  

        tf1=new JTextField();  

        tf1.setBounds(50,50,150,20);  

        tf2=new JTextField();  

        tf2.setBounds(50,100,150,20);  

        tf3=new JTextField();  

        tf3.setBounds(50,150,150,20);  

        tf3.setEditable(false);   

        b1=new JButton("+");  

        b1.setBounds(50,200,50,50);  

        b2=new JButton("-");  

        b2.setBounds(120,200,50,50);  

        b1.addActionListener(this);  

        b2.addActionListener(this);  

        f.add(tf1);f.add(tf2);f.add(tf3);f.add(b1);f.add(b2);  

        f.setSize(300,300);  

        f.setLayout(null);  

        f.setVisible(true);  

    }         

    public void actionPerformed(ActionEvent e) {  

        String s1=tf1.getText();  

        String s2=tf2.getText();  

        int a=Integer.parseInt(s1);  

        int b=Integer.parseInt(s2);  

        int c=0;  

        if(e.getSource()==b1){  

            c=a+b;  

        }else if(e.getSource()==b2){  

            c=a-b;  

        }  

        String result=String.valueOf(c);  

        tf3.setText(result);  

    }  

public static void main(String[] args) {  

    new TextFieldExample();  

} 

}

output:-

another example with username and password  display in textfield.

import javax.swing.*;    

import java.awt.event.*;  

public class PasswordFieldExample {  

    public static void main(String[] args) {    

    JFrame f=new JFrame("Password Field Example");    

     final JLabel label = new JLabel();            

     label.setBounds(20,150, 200,50);  

     final JPasswordField value = new JPasswordField();   

     value.setBounds(100,75,100,30);   

     JLabel l1=new JLabel("Username:");    

        l1.setBounds(20,20, 80,30);    

        JLabel l2=new JLabel("Password:");    

        l2.setBounds(20,75, 80,30);    

        JButton b = new JButton("Login");  

        b.setBounds(100,120, 80,30);    

        final JTextField text = new JTextField();  

        text.setBounds(100,20, 100,30);    

                f.add(value); f.add(l1); f.add(label); f.add(l2); f.add(b); f.add(text);  

                f.setSize(300,300);    

                f.setLayout(null);    

                f.setVisible(true);     

                b.addActionListener(new ActionListener() {  

                public void actionPerformed(ActionEvent e) {       

                   String data = "Username " + text.getText();  

                   data += ", Password: "   

                   + new String(value.getPassword());   

                   label.setText(data);          

                }  

             });   

}  

}  

Output:-

Another example with check box :-

import javax.swing.*;  

import java.awt.event.*;  

public class CheckBoxExample extends JFrame implements ActionListener{  

    JLabel l;  

    JCheckBox cb1,cb2,cb3;  

    JButton b;  

    CheckBoxExample(){  

        l=new JLabel("Food Ordering System");  

        l.setBounds(50,50,300,20);  

        cb1=new JCheckBox("Pizza @ 100");  

        cb1.setBounds(100,100,150,20);  

        cb2=new JCheckBox("Burger @ 30");  

        cb2.setBounds(100,150,150,20);  

        cb3=new JCheckBox("Tea @ 10");  

        cb3.setBounds(100,200,150,20);  

        b=new JButton("Order");  

        b.setBounds(100,250,80,30);  

        b.addActionListener(this);  

        add(l);add(cb1);add(cb2);add(cb3);add(b);  

        setSize(400,400);  

        setLayout(null);  

        setVisible(true);  

        setDefaultCloseOperation(EXIT_ON_CLOSE);  

    }  

    public void actionPerformed(ActionEvent e){  

        float amount=0;  

        String msg="";  

        if(cb1.isSelected()){  

            amount+=100;  

            msg="Pizza: 100\n";  

        }  

        if(cb2.isSelected()){  

            amount+=30;  

            msg+="Burger: 30\n";  

        }  

        if(cb3.isSelected()){  

            amount+=10;  

            msg+="Tea: 10\n";  

        }  

        msg+="-----------------\n";  

        JOptionPane.showMessageDialog(this,msg+"Total: "+amount);  

    }  

    public static void main(String[] args) {  

        new CheckBoxExample();  

    }  

}  

output:-

JtextArea example :-

import javax.swing.*;  

import java.awt.event.*;  

public class TextAreaExample implements ActionListener{  

JLabel l1,l2;  

JTextArea area;  

JButton b;  

TextAreaExample() {  

    JFrame f= new JFrame();  

    l1=new JLabel();  

    l1.setBounds(50,25,100,30);  

    l2=new JLabel();  

    l2.setBounds(160,25,100,30);  

    area=new JTextArea();  

    area.setBounds(20,75,250,200);  

    b=new JButton("Count Words");  

    b.setBounds(100,300,120,30);  

    b.addActionListener(this);  

    f.add(l1);f.add(l2);f.add(area);f.add(b);  

    f.setSize(450,450);  

    f.setLayout(null);  

    f.setVisible(true);  

}  

public void actionPerformed(ActionEvent e){  

    String text=area.getText();  

    String words[]=text.split("\\s");  

    l1.setText("Words: "+words.length);  

    l2.setText("Characters: "+text.length());  

}  

public static void main(String[] args) {  

    new TextAreaExample();  

}  

}  

output:-

JRadioButton examples:-

import javax.swing.*;    

import java.awt.event.*;    

class RadioButtonExample extends JFrame implements ActionListener{    

JRadioButton rb1,rb2;    

JButton b;    

RadioButtonExample(){      

rb1=new JRadioButton("Male");    

rb1.setBounds(100,50,100,30);      

rb2=new JRadioButton("Female");    

rb2.setBounds(100,100,100,30);    

ButtonGroup bg=new ButtonGroup();    

bg.add(rb1);bg.add(rb2);    

b=new JButton("click");    

b.setBounds(100,150,80,30);    

b.addActionListener(this);    

add(rb1);add(rb2);add(b);    

setSize(300,300);    

setLayout(null);    

setVisible(true);    

}    

public void actionPerformed(ActionEvent e){    

if(rb1.isSelected()){    

JOptionPane.showMessageDialog(this,"You are Male.");    

}    

if(rb2.isSelected()){    

JOptionPane.showMessageDialog(this,"You are Female.");    

}    

}    

public static void main(String args[]){    

new RadioButtonExample();    

}

}   

output:-

JcomboBox example :-

import javax.swing.*;    

import java.awt.event.*;    

public class ComboBoxExample {    

JFrame f;    

ComboBoxExample(){    

    f=new JFrame("ComboBox Example");   

    final JLabel label = new JLabel();          

    label.setHorizontalAlignment(JLabel.CENTER);  

    label.setSize(400,100);  

    JButton b=new JButton("Show");  

    b.setBounds(200,100,75,20);  

    String languages[]={"C","C++","C#","Java","PHP"};        

    final JComboBox cb=new JComboBox(languages);    

    cb.setBounds(50, 100,90,20);    

    f.add(cb); f.add(label); f.add(b);    

    f.setLayout(null);    

    f.setSize(350,350);    

    f.setVisible(true);       

    b.addActionListener(new ActionListener() {  

        public void actionPerformed(ActionEvent e) {       

String data = "Programming language Selected: "   

   + cb.getItemAt(cb.getSelectedIndex());  

label.setText(data);  

}  

});           

}    

public static void main(String[] args) {    

    new ComboBoxExample();         

}    

}   

output:-

Jlist  example :-

import javax.swing.*;  

import java.awt.event.*;  

public class ListExample  

{  

     ListExample(){  

        JFrame f= new JFrame();  

        final JLabel label = new JLabel();          

        label.setSize(500,100);  

        JButton b=new JButton("Show");  

        b.setBounds(200,150,80,30);  

        final DefaultListModel<String> l1 = new DefaultListModel<>();  

          l1.addElement("C");  

          l1.addElement("C++");  

          l1.addElement("Java");  

          l1.addElement("PHP");  

          final JList<String> list1 = new JList<>(l1);  

          list1.setBounds(100,100, 75,75);  

          DefaultListModel<String> l2 = new DefaultListModel<>();  

          l2.addElement("Turbo C++");  

          l2.addElement("Struts");  

          l2.addElement("Spring");  

          l2.addElement("YII");  

          final JList<String> list2 = new JList<>(l2);  

          list2.setBounds(100,200, 75,75);  

          f.add(list1); f.add(list2); f.add(b); f.add(label);  

          f.setSize(450,450);  

          f.setLayout(null);  

          f.setVisible(true);  

          b.addActionListener(new ActionListener() {  

              public void actionPerformed(ActionEvent e) {   

                 String data = "";  

                 if (list1.getSelectedIndex() != -1) {                       

                    data = "Programming language Selected: " + list1.getSelectedValue();   

                    label.setText(data);  

                 }  

                 if(list2.getSelectedIndex() != -1){  

                    data += ", FrameWork Selected: ";  

                    for(Object frame :list2.getSelectedValues()){  

                       data += frame + " ";  

                    }  

                 }  

                 label.setText(data);  

              }  

           });   

     }  

public static void main(String args[])  

    {  

   new ListExample();  

    }}  

output:-

https://javadevelopmenttricks.blogspot.com/2022/06/java-jtextfield-example-with.html

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