To maximize JFrame in Java Swing, use the following −
JFrame.MAXIMIZED_BOTH
The following is an example to maximize JFrame in Java −
package my; import javax.swing.JFrame; import javax.swing.JPanel; public class SwingDemo extends JFrame { JPanel panel = new JPanel(); public SwingDemo() { setVisible(true); setDefaultCloseOperation(EXIT_ON_CLOSE); setAlwaysOnTop(true); setResizable(true); setExtendedState(this.getExtendedState() | JFrame.MAXIMIZED_BOTH); } public static void main(String[] args) { new SwingDemo(); } }
The output is as follows. Here, the JFrame is visible with no border and title −