APCSA Unit 1- College Board Video Notes

Based off College Board videos

Block comments

Block comments

Text between /* and */ characters ignored by the compiler. Includes name, date, purpose.

Main method

Controls program action. Example:public static void main(String[] args){.

System.out

Object for console output. Example:System.out.print / System.out.println.

String literals

Exact sequence of characters enclosed in quotation marks.

Syntax errors

Mistakes in code structure. Example:system.out.prnt, (“A Rocks);.

Logic errors

Incorrect usage of code leading to unexpected results.

Variables

Named memory locations holding specific values.

Constant

Variable with a value that cannot change, declared using 'final'.

Literal

Source code representation of a fixed value. Example:3.

Basic Arithmetic Operators

Include +, -, *, /, % (modulus).

Operator Precedence

Follows PEMDAS, left to right evaluation.

Equal Sign (=)

Assigns value on the right to the variable on the left.

Compound Assignment Operators

Include +=, x++; for concise operations.

Increment and Decrement Operators

Used to add or subtract 1 from a value.

Casting

Changing data type of a variable in Java.

Int

Range from -2147483647 to 2147483647 (Integer.MIN_VALUE to Integer.MAX_VALUE).

Double

Supports up to 14-15 digits, unexpected results beyond range.