import java.awt.event.KeyEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
public class MnemonicButton {
public static void main(String args[]) {
JFrame frame = new JFrame("DefaultButton");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JButton button1 = new JButton("Text Button");
button1.setMnemonic(KeyEvent.VK_B);
frame.add(button1);
frame.setSize(300, 200);
frame.setVisible(true);
}
}