Beginning Programming with Java For Dummies, IBM Limited Edition by Barry Burd

Author:Barry Burd
Language: eng
Format: epub, mobi
ISBN: 9781118417560
Published: 2014-05-28T14:49:32+00:00

When to initialize?

Take a look at Listing 10-1 and notice the price variable’s initialization:

double price = 0.00;

This line declares the price variable and sets the variable’s starting value to 0.00. When I omit this initialization, I get an error message:

The local variable price may not have been initialized

What’s the deal here? I don’t initialize the age variable, but the compiler doesn’t complain about that. Why is the compiler fussing over the price variable?

The answer is in the placement of the code’s assignment statements. Consider the following two facts:

The statement that assigns a value to age (age = keyboard.nextInt()) isn't inside an if statement. That assignment statement always gets executed, and (as long as nothing extraordinary happens) the variable age is sure to be assigned a value.

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