Programming Languages Quiz

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Questions and Answers

Which of the following types of languages best describes Java?

Machine language

Low-level language

Scripting language

High-level language (correct)

In what kind of language are the original source files distributed to the target computer?

Compiled language

Assembly language

Machine language

Interpreted or scripted language (correct)

Which language family has been around since the 1970s and gained object-oriented concepts in a later decade?

Java

Pascal

Python

C / C++ (correct)

Which pair of companies are the original and current owners of the Java language?

Sun Microsystems, Oracle Signup and view all the answers

What important JRE component lets Java programs run on any operating system without recompiling?

Java Virtual Machine (JVM) Signup and view all the answers

The Java compiler will turn files from which input format to which output format?

.java to .class Signup and view all the answers

What part of the Java platform will programmers install to get tools that compile Java source code?

JDK Signup and view all the answers

What key feature distinguishes Java from earlier, high-level compiled languages like C++?

You can compile Java programs once and they will run on any computer with a JVM Signup and view all the answers

What is the name of the command we can use to display a line of text to the output console?

System.out.println() Signup and view all the answers

Which of the following keywords does Java use to describe a group of statements that work together to perform a task?

class Signup and view all the answers

Which of the following contains a properly formatted main() method declaration?

public static void main(String[] args) Signup and view all the answers

Which important pair of symbols are used to mark the start and end of classes, methods, and other blocks of code?

Opening and closing curly braces { and } Signup and view all the answers

Which symbol is used to mark the end of a program statement?

Semicolon ; Signup and view all the answers

Why is using white space important in your Java source code?

It makes your code more readable for humans Signup and view all the answers

How do you start and end a multi-line comment?

Start with /* and end with */ Signup and view all the answers

What is the purpose of indenting some statements to the right in Java source files?

Gives a visual hint as to which pieces of code belong together in the same block Signup and view all the answers

Which area would you visit within Oracle's online Java documents to get reference information on any class in the JCL?

API Documentation Signup and view all the answers

Which area would you visit to get step-by-step guidance on a variety of Java topics?

Java Tutorials Signup and view all the answers

Which of the following data types is best suited to hold the number of goals scored by a soccer team?

int Signup and view all the answers

Which of the following data types is best suited to hold the elapsed time in a race, including two digits to the right of the decimal point?

float Signup and view all the answers

Which data type would you choose to hold the answer to a true / false question?

boolean Signup and view all the answers

Which data type will hold a single character like 'X'?

char Signup and view all the answers

What limits a numeric data type's precision and range?

The number of bytes of memory used to hold the data Signup and view all the answers

What is the best naming style to use for a variable that contains a count of the number of frogs in a pond?

All styles are equally valid; just be consistent Signup and view all the answers

What two things do you need to declare (but not initialize) a new variable in your code?

data type and variable name Signup and view all the answers

Which of the following variable names is invalid?

2ndRace Signup and view all the answers

Which of the following statements will successfully assign a true value to the boolean variable 'isReady'?

isReady = true; Signup and view all the answers

Study Notes

Java Language Characteristics

Java is classified as a high-level language, designed for readability and ease of use.
It differs from machine language, which consists of binary instructions directly understood by the computer's CPU.
Original source files in interpreted or scripted languages are typically run without prior compilation.

Java Language Family and History

The C/C++ language family emerged in the 1970s and later adapted object-oriented programming concepts.
The original owner of Java was Sun Microsystems, which later became Oracle.

Java Runtime and Development

The Java Virtual Machine (JVM) enables Java programs to run on any operating system without recompilation.
Java source code is compiled from .java files to .class files by the Java compiler.
The Java Development Kit (JDK) provides essential tools for compiling Java code and creating executable distributions.

Source Code Structure

A key feature of Java is cross-platform compatibility, where compiled programs run on any computer with a JVM.
The command System.out.println() outputs text to the console.
The keyword class denotes a group of statements that work together in object-oriented programming.

Main Method and Code Blocks

The correct declaration for the main method is public static void main(String[] args).
Code blocks, including classes and methods, are defined by opening and closing curly braces {}.
A statement in Java ends with a semicolon ;.

Code Readability and Commenting

White space in Java source code enhances readability for developers.
Multi-line comments start with /* and end with */.
Indentation visually organizes code, indicating which lines belong to the same block.

Java Documentation Resources

API Documentation provides reference information for any class in the Java Class Library (JCL).
Java Tutorials offer step-by-step guidance on various programming topics.

Data Types in Java

The int data type is ideal for counting discrete values, such as goals scored in a soccer game.
The float data type is well-suited for measuring elapsed time, allowing for decimal precision.
The boolean data type is used to represent true or false values, while char holds single characters.

Variable Declaration and Naming

Numeric data types' precision and range are limited by the number of bytes allocated in memory.
When declaring a variable, both the data type and variable name are required but initialization is optional.
Variable names must not contain spaces, making "race time" an invalid name.

Variable Assignment and Operations

The statement isReady = true; assigns a true value to an already declared boolean variable.
A series of assignments such as int result = 42; result = 43; result = 44; results in the variable result storing the last assigned value, which is 44.

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Description

Test your knowledge of programming languages with this engaging quiz! Each question explores different types of programming languages, including high-level and machine languages. Perfect for beginners and enthusiasts alike.