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Top 10 Java Swing Interview Questions for 2022

1) What is Java Swing?

It is a part of JFC (Java Foundation Classess) that is used to create window-based applications. Java Swing components are platform independent and lightweight .

2) What is difference between AWT and Swing?

The differences between AWT and Swing are:
AWT Swing
Platform-dependent Platform-independent
Heavyweight components Lightweight components
Doesn't support pluggable look and feel Supports pluggable look and feel
Doesn't Follow MVC (Model View Controller) Follow MVC (Model View Controller)
Less components More components

3) What are the methods of component class in Java Swing?

There are four types of methods of component class are:
  • public void add(Component c)
  • public void setSize(int width, int height)
  • public void setLayout(LayoutManager m)
  • public void setVisible(boolean b)

4) How many ways to create a frame in Java Swing ?

There are two ways to create a frame:
  • By Association(creating the object of Frame class)
  • By Inheritance(extending Frame class)

5) Write a simple Java Swing program to create a JButton and adding it on the JFrame object inside the main() method?

Example:
import javax.swing.*;  
public class SwingExample  
{  
public static void main(String[] args)  
{  
JFrame f=new JFrame("SIMPLE FRAME");  
JButton b=new JButton("Click Me");  
b.setBounds(50, 50, 100, 50);  
f.add(b);  
f.setSize(500, 500);  
f.setLayout(null);  
f.setVisible(true);  
}  
}

6) What are the methods of AbstractButton class in Java Swing?

There are several types of methods of AbstractButton class are:
  • void setIcon(Icon b)
  • Icon getIcon()
  • void setText(String s)
  • String getText()
  • void setEnabled(boolean b)
  • void setMnemonic(int a)
  • void addActionListener(ActionListener a)

7) Write a simple Java Swing program to create a JButton by inherit the JFrame Class?

Example:
import javax.swing.*;  
public class SwingExample2 extends JFrame  
{  
SwingExample2()  
{  
JButton b= new JButton("Click Me");  
b.setBounds(50, 50, 100, 50);  
add(b);  
setSize(500,500);  
setLayout(null);  
setVisible(true);  
}  
public static void main(String[] args)   
{  
new SwingExample2();  
}  
}

8) Write a simple Java Swing program to create a JButton With ActionListener?

Example of JButton with ActionListener:
import java.awt.event.*;  
import javax.swing.*;  
public class SwingExample3   
{  
public static void main(String[] args) {  
JFrame f=new JFrame();  
final JTextField tf=new JTextField();  
tf.setBounds(100, 50, 200, 30);  
JButton b=new JButton("Click Here");  
b.setBounds(100, 100, 95, 35);  
b.addActionListener(new ActionListener(){  
public void actionPerformed(ActionEvent e)  
{  
tf.setText("Welcome JavaSwing Expert");  
}  
});  
f.add(tf) ;f.add(b);  
f.setSize(500, 500);  
f.setLayout(null);  
f.setVisible(true);  
}  
}

9) Write a simple Java Swing program of displaying image on the button?

Example:
import javax.swing.*;  
public class SwingExample4 {  
SwingExample4()  
{  
JFrame f=new JFrame();  
JButton b=new JButton(new ImageIcon("C:\\132.jpg"));  
b.setBounds(125, 125, 125, 75);  
f.add(b);  
f.setSize(400, 400);  
f.setLayout(null);  
f.setVisible(true);  
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  
}  
public static void main(String[] args)   
{  
new SwingExample4();  
}

10) What are the methods of JLabel class in Java Swing?

Methods of JLabel class are:
  • void setText(String text)
  • String getText()
  • Icon getIcon()
  • int getHorizontalAlignment()
  • void setHorizontalAlignment(int alignment)