While Loop

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Syntax

while (booleanExpression) {
    // Statements to execute
}

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Execution Mechanics

1. Condition Evaluation: The JVM evaluates the booleanExpression.
2. Execution: If the expression resolves to true, the statements within the loop block are executed sequentially.
3. Iteration: Upon reaching the end of the loop block, control flow jumps back to step 1 to re-evaluate the condition.
4. Termination: If the expression resolves to false, the loop terminates immediately, and control flow passes to the first statement following the loop block.

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Technical Characteristics

• Strict Boolean Requirement: The condition must resolve strictly to a boolean primitive (true or false) or a Boolean wrapper object. Java does not support truthy/falsy type coercion (e.g., using 1 or 0 as loop conditions is invalid and will result in a compilation error).
• Variable Scope: Any variables declared within the while loop body are block-scoped. They are created at the point of declaration and destroyed at the end of each iteration.
• State Mutation: To prevent an infinite loop, the loop body must contain logic that eventually mutates the state evaluated in the booleanExpression, causing it to yield false.

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Control Transfer Statements

• break: Immediately terminates the loop, bypassing the condition evaluation. Control flow transfers to the statement immediately following the loop block.
• continue: Immediately halts the current iteration, skipping any remaining statements in the loop body. Control flow jumps directly back to the booleanExpression evaluation to determine if the next iteration should proceed.

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Infinite Loops

while (true) {
    // This block will execute indefinitely 
    // unless a break statement or an exception occurs.
}