# Loops — Core Java

Source: https://www.geekswithgeeks.com/en/core-java/java-loops

> Compare Java's for, while, do-while and enhanced for-each loops, and control iteration with break, continue and labelled statements.

## The four forms

`for` when you know the count, `while` when you loop until a condition, `do-while` to run the body at least once, and the **enhanced for** (`for-each`) to walk any array or `Iterable`.

```java
int[] nums = {2, 4, 6};
int sum = 0;
for (int n : nums) sum += n;      // for-each

int i = 0;
while (i < 3) { System.out.print(i); i++; }
```

## break, continue, labels

`break` exits the innermost loop; `continue` skips to the next iteration. A **labelled** `break outer;` can jump out of nested loops — use sparingly.