Solved: round jframe corners in java

round jframe corners in Round JFrame Corners: Enhancing Your Application’s User Interface

Creating an aesthetically pleasing user interface is essential for a successful software application. One popular design trend is to use rounded corners for window frames, giving applications a modern and smooth appearance. In this article, we will explore how to create a Java JFrame with rounded corners, walk through the code step-by-step, and delve into related libraries and functions that will help us achieve this design.

Solution: Using Java AWT and Swing

The foundation of our solution lies in the Java Abstract Window Toolkit (AWT) and Swing libraries. They provide a set of tools and components to design user interfaces. To achieve rounded corners on a JFrame, we will use a custom JFrame with a paintComponent(Graphics g) method, which will allow us to draw onto the window frame and create a unique shape for our JFrame.

import java.awt.Graphics;
import java.awt.Shape;
import java.awt.geom.RoundRectangle2D;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class RoundedCornersJFrame extends JFrame {

    private Shape shape;

    public RoundedCornersJFrame() {
        JPanel panel = new JPanel() {
            protected void paintComponent(Graphics g) {
                shape = new RoundRectangle2D.Double(0, 0, getWidth(), getHeight(), 30, 30);

    public static void main(String[] args) {
        RoundedCornersJFrame frame = new RoundedCornersJFrame();
        frame.setSize(300, 300);

Step-by-step Explanation

Now, let’s guide you through the code step-by-step:

1. First, we import necessary classes from Java AWT (Ggraphics, Shape, and RoundRectangle2D) and Swing (JFrame and JPanel) libraries.

2. Next, we create a new class called RoundedCornersJFrame that extends the JFrame class. This enables us to override the standard functionality and appearance of the JFrame.

3. We define a private Shape variable called shape that will store the rounded rectangle shape.

4. We create a constructor for the RoundedCornersJFrame class, which will perform the following actions:
– Call `setUndecorated(true)` to remove the default JFrame borders.
– Create a new JPanel (panel) and override the `paintComponent(Graphics g)` method.
– Inside the `paintComponent(Graphics g)` method, create a new RoundRectangle2D.Double instance with specified width, height, and corner arc.
– Call `g.setClip(shape)` to apply the rounded shape to the panel’s graphics object.

5. After setting our custom panel as the content pane of the JFrame, we set the default close operation to `EXIT_ON_CLOSE`.

6. Finally, in the `main` method, we create an instance of our RoundedCornersJFrame, set its size and location, and make it visible.

AWT and Swing: Libraries for Designing UI

The Java Abstract Window Toolkit (AWT) library is a platform-independent GUI system for creating user interfaces. It provides components such as buttons, labels, and panels, as well as layout managers for organizing components within containers. The AWT also handles event handling and enables the development of custom graphics.

In contrast, Swing is a library built on top of AWT, offering an improved set of components with a more sophisticated look and feel. Swing components are light-weight, versatile, and highly customizable, making it the go-to choice for Java UI design.

These libraries, when used effectively, allow developers to create modern, visually appealing user interfaces with ease. Rounded corners on JFrames are just one example of how you can improve your application’s UI with these libraries’ features.

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