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Here, is we need to use variable names having more than one word, use all lowercase letters for the first word and capitalize the first letter of each subsequent word. Variable names cannot start with numbers.Variables must start with either a letter or an underscore, _ or a dollar, $ sign.Hence, age and AGE are two different variables. Java programming language has its own set of rules and conventions for naming variables. To learn more, visit: Can I change declaration type for a variable in Java? Just remember that we can't do something like this: However, we cannot change the data type of a variable in Java within the same scope.ĭon't worry about it for now. Here, initially, the value of speedLimit is 80.
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The value of a variable can be changed in the program, hence the name variable. It means that all variables must be declared before they can be used. Note: Java is a statically-typed language. You can declare variables and assign variables separately. In the example, we have assigned value to the variable during declaration. The int data type suggests that the variable can only hold integers. Here, speedLimit is a variable of int data type and we have assigned value 80 to it. Here's how we create a variable in Java, int speedLimit = 80 To indicate the storage area, each variable should be given a unique name (identifier). A variable is a location in memory (storage area) to hold data.