Java Control Flow: Boolean Logic, Conditionals, and Iteration Cheat Sheet

The core ideas of Java Control Flow: Boolean Logic, Conditionals, and Iteration distilled into a single, scannable reference — perfect for review or quick lookup.

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Quick Reference

Boolean Expressions

Evaluate to true or false. Relational: ==, !=, <, >, <=, >=. Logical: && (and), || (or), ! (not).

if-else Statements

Conditional branching. if checks condition; else provides alternative. else-if chains multiple conditions.

for Loops

Repeats with init, condition, update. Executes body while condition true. Counter-controlled iteration.

while and do-while Loops

while checks condition before each iteration. do-while executes body at least once, checks after.

Short-Circuit Evaluation

&& stops if left is false. || stops if left is true. Prevents unnecessary evaluation.

De Morgan Laws

!(a&&b) equals !a||!b. !(a||b) equals !a&&!b. Flip operator and negate each operand.

Nested Conditionals and Loops

Placing if/loop inside another. Inner loop completes fully for each outer iteration.

Key Terms at a Glance

Boolean Expression:Expression that evaluates to true or false.

Relational Operator:Compares values: ==, !=, <, >, <=, >=.

Logical Operator:Combines booleans: && (and), || (or), ! (not).

if Statement:Executes code block when condition is true.

else Statement:Alternative block when if condition is false.

for Loop:Counter-controlled loop with init, condition, update.

while Loop:Repeats while condition true. Checks before each iteration.

do-while Loop:Executes body at least once, checks condition after.

Short-Circuit Evaluation:Skipping right operand when result is already determined.

De Morgan Laws:Rules for negating compound boolean expressions.

break:Exits the innermost enclosing loop.

continue:Skips to next iteration of the enclosing loop.

Nested Loop:A loop inside another loop.

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