Variable Scope|Class vs Local Variables|Java|Lecture 24|Urdu|Hindi

Variable Scope|Class vs Local Variables|Java|Lecture 24|Urdu|Hindi
Variable Scope in Java
Class/Instance Variables
Declared inside the class but outside methods, constructors or block of code i.e. If/Else Statement etc.
Takes birth with object
Space is allocated in heap to objects and class variable (new keyword).
Default values are initialized.
Visible and accessible to all methods, constructors and code block of that class
Destroyed with Object
Access Modifiers i.e. Public, Private can be used.
Local Variables
Declared inside the methods, constructors or block of code i.e. If else/statement
Shorter Life as Compared to Class Variables
Local variables are created when instruction execution enters that method, constructor or block.
Local Variables destroyed once method exits.
Local variables are visible locally. Not outside the method even class.
Usually implemented at stack.
Access Modifiers can not be used.
Constructor initializes class variables only hence we have to initialize local variables.
Both Local and Class Variable can be used in method
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