Java Loops (do-while) 🎉

Welcome to our Java Loops (do-while) tutorial! Let's dive into a practical and educational journey that will help you understand and master the do-while loop in Java.

What is a do-while loop? 💡

A do-while loop is a control structure that allows code to repeatedly execute as long as a certain condition is true. Unlike a while loop, the do-while loop checks the condition after the code block has executed at least once.

Why use a do-while loop? 📝

You might choose to use a do-while loop when you know that the code block should execute at least once before checking the condition. This is different from a while loop, which may not execute the code block if the condition is initially false.

Syntax 🎯

The basic syntax of a do-while loop is as follows:

java

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

Example 1: Counting numbers 1-10 💡

Let's create a simple do-while loop to count numbers from 1 to 10.

java

int number = 1;
do {
    System.out.println(number);
    number++;
} while (number <= 10);

✅ Run the code and verify that the output is 1 2 3 4 5 6 7 8 9 10.

Example 2: Reading user input 💡

In this example, we'll use a do-while loop to continuously ask a user for input until they provide a valid number.

java

Scanner scanner = new Scanner(System.in);
int validNumber = 0;

do {
    System.out.println("Please enter a number:");
    String input = scanner.nextLine();

    try {
        validNumber = Integer.parseInt(input);
    } catch (NumberFormatException e) {
        System.out.println("Invalid input! Please enter a number.");
    }
} while (validNumber == 0);

💡 Pro Tip: In this example, we use a try-catch block to handle invalid user input. If the input is not a number, the loop will continue asking for input until a valid number is entered.

Quiz 🎯

That's it for today! You've learned the basics of the do-while loop in Java. Stay tuned for more tutorials on Java loops and other exciting topics! 😊