How to get password in SWT

[Java Tip]

import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

public class UserPassword {
  Display display = new Display();
  Shell shell = new Shell(display);
  Text textUser;
  Text textPassword;

  private void init() {
    (new Label(shell, SWT.NULL)).setText("User name: ");
    textUser = new Text(shell, SWT.SINGLE | SWT.BORDER);
    textUser.setText("default_user");
    textUser.setTextLimit(16);
    (new Label(shell, SWT.NULL)).setText("Password: ");
    textPassword = new Text(shell, SWT.SINGLE | SWT.BORDER);
    System.out.println(textPassword.getEchoChar());
    textPassword.setEchoChar('*');
  }  
  public UserPassword() {
    shell.setLayout(new GridLayout(2, false));
    init();
    textUser.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
    textPassword.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
    shell.pack();
    shell.open();
    //textUser.forceFocus();

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

    display.dispose();
  }



  public static void main(String[] args) {
    new UserPassword();
  }
}