Java Primitive Types and Objects
IntermediateJava is a statically typed, object-oriented programming language used in AP Computer Science A. Understanding primitive data types and objects forms the foundation of all Java programming. Java provides eight primitive types: int, double, boolean, char, byte, short, long, and float.
Objects are accessed through reference variables that store memory addresses. The String class provides methods for text manipulation. Primitives copy values while references copy addresses.
Type casting includes widening (automatic, int to double) and narrowing (explicit cast, double to int). The Math class provides static methods, and wrapper classes enable autoboxing.
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Standards
- AP-CSA-VAR
- AP-CSA-MOD
Learning objectives
- •Identify and use Java primitive data types for declarations and arithmetic
- •Apply String methods: length(), substring(), indexOf(), equals()
- •Evaluate type casting, integer division, and modulus expressions
- •Distinguish primitive value assignment from reference behavior
Recommended Resources
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Books
Barron's AP Computer Science A
by Roselyn Teukolsky
Head First Java
by Kathy Sierra and Bert Bates
5 Steps to a 5: AP CSA
by Dean R. Johnson et al.
Courses
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