APCSA Unit 1 Lesson 1 Flahscards

Array

• A collection of elements accessed using square brackets [ ].

• A type of data structure that stores data in a linear format.

• A method for sorting data in a database.

• A function that returns a single value.

Main Method

• The entry point of a Java program where execution begins. Signature includes public static void main(String[] args).

• A method that handles exceptions in Java programs.

• A method used to create new objects in Java.

• A method that returns the current date and time.

Line Comment

• Starts with // and continues to the end of the line.

• Begins with /* and ends with */.

• Used for multi-line comments.

• Indicates a comment block in the code.

Exception

• Predictable runtime errors that can be handled with try/catch blocks (e.g., ArithmeticException, NullPointerException).

• Unpredictable errors that cannot be handled in code.

• Syntax errors that occur during compilation.

• Logical errors that produce incorrect results.

Curly Braces { }

• Define blocks of code.

• Indicate a comment in code.

• Enclose a function definition.

• Separate variables in a list.

Logic Error

• Flawed reasoning causing incorrect program behavior (e.g., off-by-one errors).

• A syntax mistake that prevents the program from compiling.

• An error that occurs when the program runs out of memory.

• A runtime error that causes the program to crash.

Whitespace

• Spaces, tabs, and newlines used for readability; ignored by Java compiler.

• Characters that are visible and affect the output of the program.

• Special symbols used to denote comments in the code.

• Elements that are used to format the layout of a webpage.

Syntax Error

• Mistakes violating language rules (e.g., missing semicolons, misspelled keywords).

• Errors that occur during runtime execution of a program.

• Logical errors that produce incorrect results but do not crash the program.

• Warnings that indicate potential issues in the code but do not prevent execution.

Semicolon (;)

• Marks the end of a Java statement.

• Indicates a comment in Java code.

• Separates multiple statements on the same line.

• Denotes the beginning of a Java block.

Class

• A blueprint or template in Java for creating objects. Every Java program must have at least one class.

• A type of variable that can hold multiple values.

• A method that defines the behavior of an object.

• A special kind of loop used for iteration.