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The `static` Keyword in Java - Java Notes in English Notes

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• Subject Focus: Java Notes in English (BCA / B.Tech Syllabus)

• Core Topic: The `static` Keyword in Java - General Topics

• Overview: What is the `static` Keyword in Java? The static keyword indicates that a particular member (variable or method) belongs to the class itself, rather th...

• Key Concepts: Java static keyword, Variables methods blocks Hindi, Static nested classes,

What is the `static` Keyword in Java?

The static keyword indicates that a particular member (variable or method) belongs to the class itself, rather than to an instance (object) of that class. This means there is only one copy of a static member, which is shared among all objects created from that class. It is primarily used for memory management.

Analogy: Think of a `Student` class. An instance variable like `studentName` is unique to each student (each object). A static variable like `schoolName` would be common to all students, so it makes sense to store it once at the class level.

Uses of the `static` Keyword:

Static Variables (Class Variables): A single copy of the variable is created and shared among all objects of the class. It gets memory only once when the class is loaded.
```
class Student {
    String name;
    static String schoolName = "Central University"; // Shared by all students
}
```
Static Methods (Class Methods): A static method can be called directly using the class name, without needing to create an object. Static methods can only access other static members of the class directly. The `main` method is a prime example.
```
class Calculator {
    static int add(int a, int b) { // Static method
        return a + b;
    }
}
// Calling the static method
int sum = Calculator.add(5, 10);
```
Static Blocks: A block of code preceded by the `static` keyword. It is executed only once, when the class is first loaded into memory. It is used to initialize static variables.
```
class MyClass {
    static {
        System.out.println("Static block executed.");
    }
}
```

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What is the `static` Keyword in Java?.

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The `static` Keyword in Java

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What is the `static` Keyword in Java?

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