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Explanation

In Java, 'static' is a keyword used for memory management. It is used for variables, methods, blocks, and nested classes. A static member belongs to the class rather than an instance, meaning it is shared among all objects of that class.

Code:

class Test {
    static int count = 0;

    Test() {
        count++;
        System.out.println(count);
    }
}

Explanation

Static variables are shared across all instances of a class. They are commonly used for constants or shared counters.

Code:

class Company {
    static String companyName = "TechCorp";
}

Explanation

Static methods can be called without creating an object of the class. They are often used for utility or helper functions.

Code:

class MathUtils {
    static int add(int a, int b) {
        return a + b;
    }
}

// Usage
int result = MathUtils.add(5, 3);

Explanation

Real-time usage: Static is widely used in real-world applications like utility classes (e.g., Math class), configuration settings, logging, and singleton design patterns where a single shared instance or behavior is required.

Code:

class Logger {
    static void log(String message) {
        System.out.println(message);
    }
}

Logger.log("Application started");

Explanation

Static blocks are used for initialization of static variables and are executed only once when the class is loaded.

Code:

class Config {
    static int value;

    static {
        value = 100;
        System.out.println("
Static block executed");
    }
}