Java Static vs Non-Static Methods & Difference Between For Loop and While Loop

By Bhau Automation • Java Programming for Beginners to Advanced

📌 What Are Static Methods in Java?

A static method belongs to the class, not the object. You can call it without creating an instance of the class.

✔ Key Features of Static Methods

• Accessible without object creation
• Used for utility or helper methods
• Can access only static variables
• Memory allocated once at class loading

class Demo {
    static void show() {
        System.out.println("This is a static method");
    }

    public static void main(String[] args) {
        Demo.show();  // calling without object
    }
}
  

📌 What Are Non-Static Methods in Java?

A non-static method belongs to the object. You must create an object before calling it.

✔ Key Features of Non-Static Methods

• Require object creation to call
• Can access both static & non-static data
• Each object has its own copy
• Used for object-specific behavior

class Demo {
    void display() {
        System.out.println("This is a non-static method");
    }

    public static void main(String[] args) {
        Demo obj = new Demo();
        obj.display();
    }
}
  

🔍 Static vs Non-Static Method – Quick Comparison

🔄 For Loop vs While Loop in Java

Both loops repeat code, but differ in structure and usage.

✔ For Loop

Used when the number of iterations is known.

for (int i = 1; i <= 5; i++) {
    System.out.println(i);
}
  

✔ While Loop

Used when iterations depend on a condition, not count.

int i = 1;
while (i <= 5) {
    System.out.println(i);
    i++;
}
  

📊 For Loop vs While Loop – Comparison

🎯 Interview Questions from This Topic

• Why can’t static methods use non-static variables?
• Can a non-static method call a static method?
• Which loop is better — for or while?
• What happens if while loop condition never becomes false?

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