Lesson 2.1 · College Board Unit 2
Boolean Operators
A comparison produces a boolean. Negating a conjunction changes && to || and negates both operands; negating a disjunction does the reverse.
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Unit 2: Boolean Logic and Conditionals
Where a program starts making choices. The unit covers building boolean expressions, ordering branches so they do not overlap, and the short-circuit behavior that lets a condition guard itself against its own errors.
Lessons and exercises
Lesson 2.2 · College Board Unit 2
If/Else Tracing
An else-if chain executes only its first matching branch. Independent if statements each make a separate decision.
Lesson 2.3 · College Board Unit 2
Compound Conditions
Use && when all requirements must hold and || when any alternative is sufficient. Java does not support chained comparisons such as 0 < x < 10.
Lesson 2.4 · College Board Unit 2
Short-Circuit Logic
Java evaluates && and || from left to right. Put a safety test first so an unsafe expression is skipped when necessary.
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