question: private boolean betweenZeroAndOne ( final String paramName , final double val ) { if ( ( val < 0 ) || ( val > 1 ) ) { JOptionPane . showMessageDialog ( null , paramName + "should be between 0 and 1" , "Warning!" , JOptionPane . WARNING_MESSAGE ) ; return false ; } return true ; }
target:  Helper method to check that a value is between 0 and 1 and display a warning if not.