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Android Applications
Variables
A variable is basically a container used to hold data. The data itself can be anything from a simple number to coordinates for a location on a map to a URL for a video on the web. As we just learned, Java is a statically-typed language, which means that we need to explicitly declare what type of data a variable is supposed to hold. Let s take a look at an example.
The line above is a statement that declares a variable named title that holds String, or text, data. It also assigns the text Java Basics for Android to the variable. Let s examine each numbered part:
1. The first word in a variable declaration is the data type, which tells us what kind of data the variable will hold.
2. The second word is the name of the variable, which can be anything you want following a few basic rules. Variable names must not contain any spaces or special characters; they can only have letters, numbers, and underscores. They must not start with a number, though.
3. The equals sign (=) is an operator, meaning it performs a specific operation for us. This is the assignment operator, meaning that we use it to assign values to variables. In this example it is assigning the text value on the right (#4) to the variable title on the left (#2).
4. The text in green is the String value we are working with. In Java, Strings are surrounded with double quotes to differentiate them from regular text used in the code.
5. Finally, the last character in this line is the semicolon, which is used to finish this statement. Semicolons in Java are like periods in sentences: we use them to indicate when we re done saying something. Every statement in Java must end with a semicolon (note that a statement may be displayed on multiple lines for better readability).
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