code: public char[] getPasswordValue(String fieldLabel) {
  		Component c = this.fieldMap.get(fieldLabel);
  		if (!(c instanceof JPasswordField)) {
  			return null;
  		}
  
  		return ((JPasswordField) c).getPassword();
  	}
docs: Gets the contents of a {@link JPasswordField} field.
  <p>
  For stronger security, it is recommended that the returned character array be cleared after use by setting each character
  to zero.
  
  @param fieldLabel the label of the field
  @return the contents of the field, {@code null} if not a {@code JPassword} field.
  @since 2.6.0
  @see #setFieldValue(String, String)
  @see #addPasswordField(String, String)