Part 1: `while` Loop

This article explains the while loop in Java, a type of iterative statement that executes a block of code as long as a specified condition remains true. It is useful when the number of iterations is unknown beforehand, such as reading data until the end of a file or processing database records. The while loop has a simple execution flow: evaluate the condition, execute the loop body if true, and return to step 1. The condition is checked before each iteration, and the loop may execute zero or more times. To use a while loop, the expression inside it must evaluate to a boolean value.