NetBeans付属の swing-layout-1.0.jar 等が必要

↓参照
http://winofsql.jp/VA003334/PROc070715142931.htm#ttl5

@DIV
import java.awt.*;

public class NewJFrame extends javax.swing.JFrame {
    
    /** Creates new form NewJFrame */
    public NewJFrame() {
// タイトルをなくす
[[        this.setUndecorated(true);]]
        
        initComponents();

// フルスクリーン        
[[        GraphicsDevice device = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice();
        device.setFullScreenWindow(this);]]
        
        
    }
    
    private void initComponents() {
        jButton1 = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        jButton1.setText("jButton1");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        org.jdesktop.layout.GroupLayout layout = new org.jdesktop.layout.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(layout.createSequentialGroup()
                .add(148, 148, 148)
                .add(jButton1)
                .addContainerGap(175, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(layout.createSequentialGroup()
                .add(82, 82, 82)
                .add(jButton1)
                .addContainerGap(195, Short.MAX_VALUE))
        );
        pack();
    }

// 終了
    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
        System.exit(0);
    }
    
// エントリポイント
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new NewJFrame().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify
    private javax.swing.JButton jButton1;
    // End of variables declaration
    
}
@END