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Static Keyword

The static keyword in programming (especially in Java, C++, etc.) is used to indicate that a variable, method, or block belongs to the class rather than any specific object of the class.

🔹 Static Variables:

A static variable is shared across all instances of a class.

java

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class Demo {

static int count = 0;

}

All objects share the same count variable.

Memory is allocated only once.

🔹 Static Methods:

Static methods can be called without creating an object of the class.

java

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class Demo {

static void show() {

System.out.println("Hello");

}

Demo.show(); // Correct

Cannot access non-static members directly.

Commonly used for utility or helper methods.

🔹 Static Block:

Used for static initialization.

java

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static {

System.out.println("Static block runs once when class is loaded.");

}

🔹 Why Use Static?

Reduces memory usage.

Useful for constants (static final).

Helpful in utility classes (like Math class in Java).

⚠️ Limitations:

Can’t access instance (non-static) members.

Reduces flexibility if overused.

Conclusion:

The static keyword is powerful for shared resources, class-level operations, and memory-efficient design. Use it wisely to write clean, optimized code.

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