Rectangle with rounded corners drawn using Java 2D Graphics API

     

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.RoundRectangle2D;

import javax.swing.JFrame;

public class Main extends JFrame {

  public Main() {
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setSize(600, 600);
  }

  public void paint(Graphics g) {
    Graphics2D graphics2 = (Graphics2D) g;
    RoundRectangle2D roundedRectangle = new RoundRectangle2D.Float(10, 10, 240, 160, 10, 10);
    graphics2.draw(roundedRectangle);
  }

  public static void main(String args[]) {
    new Main().setVisible(true);
  }
}

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Rectangle with rounded corners drawn using Java 2D Graphics API : Shape « 2D Graphics GUI « Java

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