Java Software Basics

What is a variable in Java?

• A variable in Java is a fixed value that cannot be changed

• A variable in Java is a container that holds data which can be changed during the execution of a program.

• A variable in Java is a type of loop

• A variable in Java is a type of function

What are the different data types in Java?

• float, long, byte, short, double

• true, false, null, void, this

• if, else, switch, case, default

• int, double, char, boolean, String, Arrays, Classes, etc.

How do you declare a variable in Java?

• variable_name = data_type;

• int variable_name;

• variable_name = new data_type();

• data_type variable_name;

What is the syntax for printing in Java?

• Println.System.out

• System.out.print()

• System.out.printline()

• System.out.println()

What is the purpose of the 'System.out.println()' command in Java?

• To format the specified message in the console

• To input the specified message from the console

• To delete the specified message from the console

• To print the specified message to the console

What is the difference between 'System.out.print()' and 'System.out.println()' in Java?

• System.out.print() and System.out.println() are the same

• System.out.println() prints the output without a newline

• System.out.print() prints the output with a newline at the end

• System.out.print() prints the output without a newline, while System.out.println() prints the output with a newline at the end.

What is the 'Scanner' class used for in Java?

• To perform mathematical calculations

• To get user input from the keyboard.

• To play audio files

• To create graphics

How do you take user input in Java?

• Scanner class

• Math.random()

• System.out.println()

• BufferedReader class

What are the different types of input/output streams in Java?

• FileInputStream, FileOutputStream, DataInputStream, DataOutputStream, BufferedInputStream, BufferedOutputStream, ObjectInputStream, ObjectOutputStream

• TextInputStream, TextOutputStream

• ReadFile, WriteFile

• InputReader, OutputWriter

What is the 'nextLine()' method used for in Java?

• To check for the next available input

• To read a complete line of text from the input stream.

• To create a new line in the output

• To perform mathematical calculations