Java Loops (for, while, do-while) — Full Beginner Guide

-

Java Loops: for, while and do-while (With Examples)

✨ Quick Summary

In this post, you’ll learn how to repeat tasks in Java using Loops. We will cover for, while, and do-while loops with simple beginner-friendly examples.

Java Beginner Loops for / while / do-while

In our previous post, we learned about Conditional Statements like if-else and switch.

Now, let’s learn one of the most important concepts in programming: Loops.

A loop is used when you want to repeat a block of code multiple times.

1) for Loop

The for loop is used when you already know how many times you want to repeat a task.

Syntax


for(initialization; condition; increment/decrement) {
    // code to repeat
}

Example: Print numbers from 1 to 5


public class ForLoopExample {
    public static void main(String[] args) {

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

2) while Loop

The while loop is used when you don’t know the exact number of repetitions. It will run until the condition becomes false.

Syntax


while(condition) {
    // code to repeat
}

Example: Print numbers from 1 to 5


public class WhileLoopExample {
    public static void main(String[] args) {

        int i = 1;

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

3) do-while Loop

The do-while loop is similar to while loop. But the difference is:

✅ do-while always runs at least one time even if the condition is false.

Syntax


do {
    // code to repeat
} while(condition);

Example


public class DoWhileExample {
    public static void main(String[] args) {

        int i = 1;

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

4) break and continue in Loops

Java provides two important keywords inside loops:

  • break → stops the loop immediately
  • continue → skips the current iteration and moves to the next

Example: break


public class BreakExample {
    public static void main(String[] args) {

        for (int i = 1; i <= 10; i++) {
            if (i == 5) {
                break;
            }
            System.out.println(i);
        }
    }
}

Example: continue


public class ContinueExample {
    public static void main(String[] args) {

        for (int i = 1; i <= 5; i++) {
            if (i == 3) {
                continue;
            }
            System.out.println(i);
        }
    }
}

Conclusion

Loops are extremely important in Java because they help you:

  • ✅ Repeat tasks
  • ✅ Save time and reduce code
  • ✅ Build real-world programs

In the next post, we will learn about Java Arrays and how to store multiple values in one variable!

Comments

Post a Comment

Popular posts from this blog

Inheritance in Java (Single, Multilevel, Hierarchical)

-
Inheritance in Java: Single, Multilevel & Hierarchical (With Examples) ✨ Quick Summary In this post, you’ll learn what Inheritance is in Java and how one class can acquire properties and methods of another class. We will cover single inheritance , multilevel inheritance , and hierarchical inheritance with easy examples. Java OOP Inheritance OOP Concepts In our previous post, we learned about Encapsulation and how to protect data using getters and setters . Now it’s time to learn another powerful OOP concept: Inheritance . 1) What is Inheritance? Inheritance means one class (child class) can acquire the properties and methods of another class (parent class). Inheritance helps you: ✅ Reuse code ✅ Reduce duplicate code ✅ Create a clean class structure In Java, we use the keyword extends for inheritance. 2) Example of Single Inheritance Single inheritance means: one child class inherits from o...
Read more

The Java Blueprint: Your First Step into Software Development

-
Image
Introduction Java has been one of the world's most popular programming languages for decades. Its " Write Once, Run Anywhere " (WORA) philosophy makes it a powerhouse for everything from Android apps to large-scale enterprise systems. Today, we are going to break down the basics and write your first program. Why Choose Java? Platform Independence : Java programs run on any device that has a Java Virtual Machine ( JVM ). Object-Oriented : It helps you organize complex code into manageable "objects." Strong Community: There are millions of Java developers, meaning you can always find help when you're stuck. Setting the Stage Before you code, you need two things: JDK (Java Development Kit): This is the engine that compiles and runs your code. An IDE : I recommend IntelliJ IDEA or VS Code to make writing code much easier. Your First Program: Hello World Let’s look at the classic first program. In Java, every piece of code must live inside a class. public cl...
Read more

Java Variables and Data Types: Storing Your Data

-
 Introduction In our last post, we got our first Java program running. Now, it's time to talk about how Java handles information. In programming, we use Variables to store data that our program can use and change. What is a Variable? Think of a variable as a labeled box. You put a value inside the box, and you give the box a name so you can find it later. Because Java is a strongly typed language , you must tell the computer what kind of data is going inside that box. The Basic Data Types Here are the most common data types you will use in Java: int : Used for whole numbers (e.g., 10, -500, 1000). double : Used for decimal numbers (e.g., 19.99, 3.14). String : Used for text (e.g., "Hello Java"). boolean : Used for true/false values. Code Example: Putting it Together Copy and paste this example into your IDE to see how variables work: public class VariableExample {     public static void main(String[] args) {         // Declaring and initializing v...
Read more