What is a variable in the Java?

Answer 1

A variable is something that can store data, such as numbers and words. One of the common types of variables is called "int", which can store numbers.

Creating a variable is simple:

int myVar;

"int" is the data type of the variable, and "myVar" is the name of the variable, you can choose almost any name you want for your variables.

Then you can assign a number to this variable, you can even use negative numbers:

myVar = 5;

Notice how you do not need to type "int" again, you only need to do it once when you create the variable.

Here's how to add numbers to variables:

myVar = myVar + 4;

OR

myVar += 4;

When you do either of these it will add 4 to the value of myVar, which means myVar now equals 9. (5 + 4 = 9)

You can also use subtraction: -

Multiplication: *

Division: /

and Modulus: %

Another imortant data type is the String, a String can store words and letters, and behaves much like an int.

String myVar;

myVar = "Hello";

myVar += " there, Sir.";

Now, like we did with the int earlier, myVar equals "Hello there, Sir."

One last thing, you can add different variables together, but they must be the same data type:

myVar += anotherVar;

Answer 2

A local variable is a variable (of any primitive type: double, boolean, char, etc.) which only exists within a method. That is, it is created and used within a particular method and cannot be directly accessed by other methods in the same class or in different classes.

Answer 3

A variable is any object where the logical representation (the object's value) may be changed. A constant is the opposite of a variable; an object where the logical representation cannot be modified. Note that the logical representation is not the same as the underlying representation. The underlying representation may include mutable members which may be modified regardless of an object's "constness". The logical representation is typically used to logically compare objects with one another; mutable members should not participate in the logical representation.

Answer 4

A variable that is used as a parameter. If, for example, a method "methodA" calls a method "methodB", it may be desirable to pass information from methodA to methodB. This is done via parameters. In the calling program ("methodA"), and assuming you want to pass two integers, you might write something like:

methodB(5, 7);

//or with variables: methodB(a, b);

In methodB, the variables must be received:

methodB(int x, int y)

{

...

}

In this example, the number 5 (or the contents of variable "a") is copied to variable x, and can be used within the method body. Similarly, the second value (7, or b) is copied to variable "y", and can be used within methodB.

Answer 5

In most programming languages, including Java, an array is a single variable name that refers to a list of values. In Java, elements are counted starting at 0. Thus, if an array called myArray has 10 elements, the individual elements will be called myArray[0], myArray[1], etc., up to myArray[9].

Answer 6

variable are declared,scoped and initialized in the java programming language.