In Java, there are several types of loops used to repeat a block of code. Each type serves different purposes based on the situation. The main types of loops in Java are:

1. for Loop

The for loop is typically used when you know in advance how many times you want to execute a block of code.

for (initialization; condition; update) {
    // code to be executed
}

2. while Loop

The while loop continues executing as long as a given condition remains true. It is used when the number of iterations is not predetermined.

Syntax

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

Example:

int i = 0;
while (i < 5) {
    System.out.println(i);
    i++;
}

3. do-while Loop

The do-while loop is similar to the while loop, but it guarantees that the code block will execute at least once since the condition is checked after the loop’s body is executed.

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

Example:

int i = 0;
do {
    System.out.println(i);
    i++;
} while (i < 5);

4. Enhanced for-each Loop

The for-each loop is used to iterate over arrays or collections, allowing easier access to elements without the need for indexing.

Syntax

for (type element : array/collection) {
    // code to be executed
}

Example:

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