Java > Loop Statements

Introduction

Loop statements in Java are used to execute a block of code multiple times until a specific condition is met. They help in reducing redundancy and improving code efficiency.

Types of Loops in Java

  1. for Loop
  2. while Loop
  3. do-while Loop
  4. Enhanced for Loop (for-each loop)

1. for Loop

The for loop is used when the number of iterations is known beforehand.

Syntax

for (initialization; condition; update) {
    // Code executes while condition is true
}

Example: Print numbers from 1 to 5

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

Output:

1
2
3
4
5

2. while Loop

The while loop executes a block of code as long as the condition remains true.

Syntax

while (condition) {
    // Code executes while condition is true
}

Example: Print numbers from 1 to 5

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

Output:

1
2
3
4
5

3. do-while Loop

The do-while loop is similar to the while loop, but it ensures that the loop body executes at least once before checking the condition.

Syntax

do {
    // Code executes at least once
} while (condition);

Example: Print numbers from 1 to 5

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

Output:

1
2
3
4
5

4. Enhanced for Loop (for-each loop)

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

Syntax

for (dataType variable : collection) {
    // Code executes for each element in collection
}

Example: Print array elements

int[] numbers = {1, 2, 3, 4, 5};
for (int num : numbers) {
    System.out.println(num);
}

Output:

1
2
3
4
5

Conclusion

Loop statements in Java allow us to execute code multiple times efficiently. Understanding for, while, do-while, and enhanced for loops helps in writing clean and optimized programs.

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