Introduction to Java Applications Input/Output Flashcards
What is a Java application?
A computer program that executes when the java command launches the Java Virtual Machine (JVM).
What is the Java Virtual Machine (JVM)?
The JVM enables a computer to run Java programs.
What is the purpose of System.out.println("Welcome to Java Programming!");?
It prints “Welcome to Java Programming!” to the console.
What does public static void main(String[] args) represent?
It is the main method, the entry point of a Java application.
What are the three types of comments in Java?
-
Single-line comment:
// This is a comment -
Multi-line comment:
/* This is a multi-line comment */ -
Javadoc comment:
/** This is a Javadoc comment */
How do you declare a Java class?
Using the class keyword, followed by the class name (e.g., public class Welcome1).
What is a method in Java?
A method is a block of code that performs a task and may return a value.
What is a syntax error?
A mistake in the code that violates Java’s rules, preventing compilation.
What happens if the filename does not match the public class name?
A compilation error occurs.
What is a variable?
A named storage location in memory that holds a value.
What are Java’s primitive data types?
byte, short, int, long, float, double, char, boolean.
How do you declare an integer variable?
int x = 10;
How do you read user input in Java?
Using the Scanner class (Scanner input = new Scanner(System.in);).
How do you print output in Java?
Using System.out.print(), System.out.println(), or System.out.printf().
What does \n do in Java?
It inserts a newline.
