Where should I declare variables Java?
If it is supposed only to live while onClick is running, then it needs to be declared inside the onClick method. But if it is intended to live as long as the instance of the object then it should be an instance variable and declared at the top of the class.
Where should variables almost always be declared?
Instance variables should almost always be declared private , or perhaps protected . should be used instead of an instance variable if they work just as well. Local variables are visible only within the method they are defined in.
Where do you declare variables in C++?
int x; x = 10; int y; y = 5; These lines of code declare that a variable x exists, is of type int, and has the value 10; and that a variable y of type int also exists with the value 5. You can declare variables (almost) anywhere you want in your program — as long as you declare the variable before you use it.
Should all variables be private?
All variables should be private unless they absolutely need to be public (which is almost never, you should use properties/getters and setters). Variables largely provide the state of the object, and private variables prevent others from going in and changing the state of the object.
What is variable in C++ with example?
Variables are containers for storing data values. In C++, there are different types of variables (defined with different keywords), for example: int – stores integers (whole numbers), without decimals, such as 123 or -123. double – stores floating point numbers, with decimals, such as 19.99 or -19.99.
Should I declare variables at the top of the function for?
Should I declare variables at the top of the function for reasons other than the scope rules? In JavaScript, one should declare all variables at the beginning of the function to mitigate the risk of mistakes related to the fact that the scope of variables is a function.
Where do you declare a variable in Java?
But in the name of best coding practice it is recommended to declare the variable in the smallest possible scope (in this example it is inside the loop, as this is the only place where the variable is used). Declaring objects in the smallest scope improve readability.
When to declare variables in a JavaScript function?
In JavaScript, one should declare all variables at the beginning of the function to mitigate the risk of mistakes related to the fact that the scope of variables is a function. The following code illustrates this non-intuitive scope by actually printing “Hello, World” to the console:
Can a variable be declared outside of a while loop?
The scope of local variables should always be the smallest possible. In your example I presume str is not used outside of the while loop, otherwise you would not be asking the question, because declaring it inside the while loop would not be an option, since it would not compile.