Unit 2: Using Objects
AP Computer Science AWhat you'll master in this unit
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Objects vs. primitives — the big picture
Key concepts at a glance
java
String greeting = new String("Hello");
java
int len = greeting.length(); // 5
String sub = greeting.substring(1); // "ello"
java
double result = Math.pow(2, 10); // 1024.0
int absolute = Math.abs(-42); // 42
Why Unit 2 matters for the AP exam
Common themes to watch for
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