Do-while Loop In Java

do-while loop** in Java — it’s a very useful control structure, especially when you want the code to run at least once no matter what.

🔁 What is a do-while Loop?

A do-while loop is a type of looping control structure that:

• Executes the loop body first
• Then checks the condition
• If the condition is true, it repeats the loop

🧠 Syntax:

do {
   // Code to be executed
} while (condition);

📌 Key Features:

1. Runs at least once, even if the condition is false.
2. Condition is checked after the loop body.

✅ Example:

public class DoWhileExample {
    public static void main(String[] args) {
        int i = 1;
        do {
            System.out.println("Value of i: " + i);
            i++;
        } while (i <= 5);
    }
}

🔍 Output:

Value of i: 1
Value of i: 2
Value of i: 3
Value of i: 4
Value of i: 5

🔥 What if the condition is false at first?

int i = 10;
do {
    System.out.println("Hello");
} while (i < 5);

Output:

Hello

✅ Even though the condition i < 5 is false, the message is printed once!

🆚 Difference: while vs do-while

🎯 Use Case:

Use do-while when you want to guarantee one execution — e.g., taking user input at least once and continuing if user wants.