Variable Scope in Java

Scope refers to the region or context within which a variable is accessible.

Block Scope

• Block scope refers to the area within a pair of curly braces .
• Variables declared inside a block are only accessible within that block.
• Block scope is often associated with local variables.

Method Scope

• Variables declared as method parameters or local variables inside a method have method scope.
• They are only accessible within the method where they are declared.

Class Scope (Instance Variables)

• Instance variables, also known as fields, have class scope.
• They are declared within a class but outside of any method.
• Instance variables are accessible throughout the class and have the same lifetime as the class's object.

Class Scope (Static Variables)

• Static variables are shared among all instances of a class and also have class scope.
• They are declared as static within a class.
• Static variables exist for the entire lifetime of the program.

Global Scope

• Java doesn't have true global variables (variables accessible everywhere in the program).
• The closest thing to a global scope in Java is a public static variable within a class.