Manipulating Data Using Methods - Java Programming: Comprehensive Concepts and Techniques - page 172

Table 3-13 Constant Message Types

MESSAGE TYPE DISPLAYED ICON

ERROR_MESSAGE

INFORMATION_MESSAGE

WARNING_MESSAGE

QUESTION_MESSAGE

PLAIN_MESSAGE no icon display

JOptionPane dialog boxes can return a value. In the case of an input dialog
box (example 1 in Table 3-12 on the previous page), the returned value is the
data entered into the text box by the user. In example 2, a message box simply
displays a message and has no return value. In example 3, the return value is an
integer indicating the option selected by the user.
The following steps replace the readLine() methods with JOptionPane
showMessageDialog() and showInputDialog() methods, as shown in Table 3-14.

Table 3-14 Replacing Code to Create Swing Dialog Boxes

LINE DELETE OLD CODE REPLACE WITH NEW CODE

36 System.out.println(“\tYOUR JOptionPane.showMessageDialog(null, “YOUR BODY

BODY MASS INDEX IS “ + MASS INDEX IS “ + Math.round(index) +”.”, “Body Mass

Math.round(index) + “.”); Calculator”,JOptionPane.PLAIN_MESSAGE);

26, 27 System.out.print(“\t\tEnter your weight=JOptionPane.showInputDialog(null, ”Enter your

weight to the nearest pound: “); weight to the nearest pound: “);

weight = dataIn.readLine();

23, 24 System.out.print(“\t\tEnter your height=JOptionPane.showInputDialog(null, ”Enter your

height to the nearest inch: “); height to the nearest inch: “);

height = dataIn.readLine();