Difference Between Variable And Constant In Java
distinguishing between variables and constants in Java
Difference Between Variable And Constant In Java
In Java, a variable is a storage location that holds a value, and this value can change during the program's execution. Variables are declared with a specific data type which defines the kind of values they can hold. On the other hand, a constant is a value that remains the same throughout the program and cannot be changed once it is assigned a value. Constants are typically declared using the `final` keyword in Java and are often used for storing values that are meant to be fixed and do not need to be modified.
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1 - Variables in Java:
Variables in Java are used to store data that can be changed or modified during program execution. They are used to represent different types of values such as numbers, text, or objects.
2) Constants in Java:
Constants are used to define values that remain fixed throughout the program and cannot be changed once defined. They are declared using the ‘final’ keyword in Java.
3) Mutability:
Variables are mutable, meaning their values can be modified during program execution. Constants, on the other hand, are immutable and their values cannot be changed once defined.
4) Usage:
Variables are commonly used to store values that may change or need to be updated throughout the program. Constants are used to define values that should not change, such as mathematical constants or configuration settings.
5) Declaration:
Variables are declared using a specific data type and can be assigned a value multiple times during program execution. Constants are declared using the ‘final’ keyword and must be assigned a value at the time of declaration.
6) Scope:
Variables are scoped to the block of code in which they are declared. Constants are typically declared at the class level and can be accessed from any part of the class.
7) Naming convention:
Variables in Java typically start with a lowercase letter and follow camelCase naming convention. Constants are usually written in uppercase letters with words separated by underscores.
8) Constants for readability:
Constants are helpful in making the code more readable and maintainable, as they provide meaningful names for values that should not change.Variables offer flexibility by allowing values to be updated or modified as needed during program execution.
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