Dialog I/O: Kilometers to Miles

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Tutorial: Dialog I/O: Kilometers to Miles

This basic program asks the user for a number of miles and converts it to kilometers.

Tutorial Details:

This basic program asks the user for a number of miles and converts it to kilometers. It uses JOptionPane for all input and output.

Convert String to a number. We have to convert the input string into a number so that we can do the arithmetic with it. This conversion is done by calling Double.parseDouble. If we had wanted an integer instead of a double, we would have called Integer.parseInt.

Constant values are commonly declared static final before the methods are defined. The 'static' keyword will be explained later. If a variable is defined with the 'final' attribute, it's value can't be changed after an assignment to it, which is exactly what you want to do to prevent a constant from being changed.

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