Loops allow you to execute a block of code repeatedly as long as a specified condition is true. Java supports several types of loops.

For Loop

for (initialization; condition; increment/decrement) {
    // Code to be executed
}

Example: Counting from 1 to 5

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

// Output:
// Count: 1
// Count: 2
// Count: 3
// Count: 4
// Count: 5

Example: Looping through an Array

int[] numbers = {10, 20, 30, 40, 50};

for (int i = 0; i < numbers.length; i++) {
    System.out.println("Element: " + numbers[i]);
}

While Loop

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

Example: Counting from 1 to 5

int i = 1;

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

Do-While Loop

This loop will execute the code block at least once because the condition is checked after the loop body.

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

Example: Counting from 1 to 5

int i = 1;

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

For-Each Loop

The for-each loop is used to iterate over arrays or collections.

for (dataType element : arrayName) {
    // Code to be executed
}

Example: Iterating over an Array

int[] numbers = {10, 20, 30, 40, 50};

for (int number : numbers) {
    System.out.println("Number: " + number);
}

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Loop Control Statements

Break

Exits the loop immediately.

Example

for (int i = 1; i <= 5; i++) {
    if (i == 3) {
        break;  // Exits the loop when i is 3
    }
    System.out.println("i = " + i);
}

// Output:
// i = 1
// i = 2

Continue

Skips the current iteration and moves to the next one.

Example

for (int i = 1; i <= 5; i++) {
    if (i == 3) {
        continue;  // Skips the iteration when i is 3
    }
    System.out.println("i = " + i);
}

// Output:
// i = 1
// i = 2
// i = 4
// i = 5

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My Recommendation

We should use…

• for loop when the number of iterations is known.

• while loop when the number of iterations is unknown, but a condition is given.

• do-while when you need the loop to run at least once.

• for-each when iterating over arrays or collections.