🔄 What Are Loops?

Loops are fundamental in Java for repeating code blocks efficiently. They allow you to execute a set of instructions multiple times until a specific condition is met.

🧮 For Loop

The for loop is ideal for iterating over a known range or array.
Syntax: 

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

Example: 

for (int i = 0; i < 5; i++) {
    System.out.println("Iteration: " + i);
}
for_loop

Use Cases:

  • Iterating through arrays
  • Repeating actions a fixed number of times
  • Counting or summing values

⏳ While Loop

The while loop executes as long as a condition is true.
Syntax: 

while (condition) {
    // code to execute
}

Example: 

int count = 0;
while (count < 3) {
    System.out.println("Count: " + count);
    count++;
}
while_loop

Use Cases:

  • Repeating until a user inputs valid data
  • Iterating through a list with unknown length
  • Implementing game loops or event-driven logic

🔁 Do-While Loop

The do-while loop ensures the code block runs at least once before checking the condition.
Syntax: 

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

Example: 

int i = 0;
do {
    System.out.println("Do-While Iteration: " + i);
    i++;
} while (i < 5);
do_while_loop

Use Cases:

  • Validating user input (e.g., password confirmation)
  • Menu systems where user interaction is required
  • Situations needing guaranteed initial execution

🧩 Practice & Extend

Try writing a loop to calculate the sum of numbers from 1 to 10!
For deeper understanding, explore our guide on Java Control Flow.

java_loop_practice

Note: All images and links are illustrative. For actual learning, refer to official Java documentation or coding platforms.