To escape the mnemonic character &, you can double it and a single '&' will be displayed. : Button « SWT « Java Tutorial

1. Java Tutorial
2. SWT
3. Button

import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class EscapeMnemonicCharacter {
  public static void main(String[] args) {
    final Display display = new Display();
    final Shell shell = new Shell(display, SWT.SHELL_TRIM);
    shell.setLayout(new RowLayout());

    Button button = new Button(shell, SWT.RIGHT);

    button.setText("&&text on the button");

    shell.open();
    // Set up the event loop.
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) {
        // If no more entries in event queue
        display.sleep();
      }
    }
    display.dispose();
  }

}

17.9.Button
	17.9.1.	Introducing Button and Button Styles
	17.9.2.	Push Button
	17.9.3.	CheckBox Button
	17.9.4.	Toggle Button
	17.9.5.	RadioButton
	17.9.6.	FlatButton
	17.9.7.	ArrowButton
	17.9.8.	Add Radio Buttons to a Group
	17.9.9.	Select a Radio Button
	17.9.10.	Setting Button selection
	17.9.11.	Add Image to Button
	17.9.12.	Add Radio Buttons to a Composite to form a group
	17.9.13.	LEFT, RIGHT, CENTER: These three styles specify the text/image alignment in buttons.
	17.9.14.	To get and set a button's text label
	17.9.15.	You can include the mnemonic character in the text label.
	17.9.16.	To escape the mnemonic character &, you can double it and a single '&' will be displayed.
	17.9.17.	Set the alignment of the text/image label of a button