Difference Between Static And Non Static Variable In Java
distinguishing static and non-static variables in Java
Difference Between Static And Non Static Variable In Java
In Java, static variables are associated with the class itself, rather than with individual instances of the class. This means that a static variable is shared among all instances of the class and can be accessed using the class name. On the other hand, non-static variables are unique to each instance of the class and are specific to that instance. Static variables are initialized only once at the start of the program and retain their value throughout the execution, while non-static variables are initialized each time a new instance of the class is created.
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1 - Static variables in Java:
Static variables are associated with the class itself rather than with any specific instance of the class.
They are declared using the `static` keyword and are initialized only once at the start of the program execution.
All instances of the class share the same static variable.
Static variables are accessed using the class name, not through reference to any specific object.
2) Non static variables in Java:
Non static variables are associated with instances of the class (objects) rather than with the class itself.
They are initialized separately for each instance of the class.
Each object of the class maintains its own copy of non static variables.
Non static variables can only be accessed through an object reference, not through the class name.
3) Differences in memory allocation:
Static variables are allocated memory when the class is loaded into the memory, while non static variables are allocated memory when an object is created.
4) Usage scenario:
Static variables are typically used to define constants or maintain values that are common across all instances of a class.
Non static variables are used to store unique values specific to each instance of the class.
5) Visibility and scope:
Static variables can be accessed directly within static methods or through the class name itself.
Non static variables can only be accessed within non static methods or through instances of the class.
6) Inheritance:
Inheritance plays a role in how static and non static variables are accessed and overridden in different classes.
7) Syntax differences:
Static variables are declared as `static dataType variableName;` while non static variables are declared as `dataType variableName;`.
8) Static initialization block:
Static variables can be initialized inside a static initialization block, which executes only once when the class is loaded.
9) Non static initialization:
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Non static variables are usually initialized in a constructor or through instance methods that are called upon object creation.
10) Role in OOP:
Understanding the concept of static and non static variables is crucial for implementing object oriented programming principles effectively in Java.
This explanation should provide a good overview of the differences between static and non static variables in Java, which would be beneficial for students attending the training program.
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