Head First Java - Chapter One Test

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Quizzes Created: 1 | Total Attempts: 319
| Attempts: 319
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  • 1/14 Questions

    Java is case-sensitive.

    • True
    • False
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About This Quiz

This quiz, titled 'Head First Java - Chapter One Test', assesses foundational Java programming skills. It covers basic concepts such as statements, methods, variable types, and case sensitivity. Ideal for beginners to evaluate their understanding of Java essentials.

Java Basics Quizzes & Trivia

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  • 2. 

    What do all java files end with (before put into the compiler)? What's the file extension, in other words?

    Explanation
    All Java files end with the file extension ".java". This is the standard file extension for Java source code files. The ".java" file extension is used to identify and distinguish Java files from other types of files. It is important to include the correct file extension when saving Java files, as it allows the compiler to recognize and process the code correctly.

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  • 3. 

    The following is the syntax of a while loop: while (condition) { ... }

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The given answer is true because the syntax of a while loop is correct. The while loop starts with the keyword "while" followed by a condition in parentheses. The code block inside the curly braces will be executed repeatedly as long as the condition evaluates to true. Therefore, the statement "True" is the correct answer.

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  • 4. 

    What is the name of the required method in all Java applications?

    Correct Answer
    main
    Main
    Explanation
    Example:
    public static void main(String[] args) { ... }

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  • 5. 

    What turns your java file into bytecode for the computer to understand?

    Correct Answer
    Java Compiler
    java compiler
    compiler
    Compiler
    Java compiler
    Explanation
    The Java Compiler is responsible for converting a Java file into bytecode, which is a low-level code that can be understood and executed by the computer. It takes the human-readable Java code and translates it into a format that the computer can interpret and execute. The Java Compiler is an essential component of the Java development process as it allows developers to write code in a high-level language and then compile it into a format that can be executed on any platform that has a Java Virtual Machine (JVM).

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  • 6. 

    What is a statement?

    • A single line of code ending in a semicolon

    • A block of code that actually does something

    • A method required to be created within the class

    Correct Answer
    A. A single line of code ending in a semicolon
    Explanation
    Example:
    int x = 3;

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  • 7. 

    How do you know what to name the file?

    • You name it from the main method

    • You name it from the class containing the main method

    • You name it from the first statement in the file

    Correct Answer
    A. You name it from the class containing the main method
    Explanation
    The correct answer is "You name it from the class containing the main method." In Java, the main method is the entry point of a program, and it must be contained within a class. Therefore, when naming a file, you should name it after the class that contains the main method.

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  • 8. 

    What is this operator: ==

    • Assignment Operator

    • Equality Operator

    • Loop Operator

    Correct Answer
    A. Equality Operator
    Explanation
    The == operator is known as the Equality Operator. It is used to compare two values and check if they are equal. When used in a conditional statement, it returns a boolean value of true if the values are equal, and false if they are not. This operator is commonly used in programming to compare variables and make decisions based on the result of the comparison.

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  • 9. 

    What is the value of x in the following code snippet? int x = 7; int r = 9; while (x < r) {      x = x + 1; } System.out.print(x);

    Correct Answer
    9
    Explanation
    The value of x in the given code snippet is 9. The code initializes x as 7 and r as 9. It then enters a while loop that continues as long as x is less than r. Inside the loop, x is incremented by 1 each time. Since x starts at 7 and r is 9, the loop will execute twice, incrementing x to 8 and then to 9. After the loop ends, the value of x is printed, which is 9.

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  • 10. 

    Java ignores whitespace.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Java ignores whitespace means that when writing code in Java, any spaces, tabs, or new lines are not considered by the compiler. This means that you can add extra spaces or line breaks in your code for better readability without affecting the functionality of the program. The compiler will simply ignore these whitespace characters and focus on the actual code. Therefore, the answer "True" is correct, as Java does indeed ignore whitespace.

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  • 11. 

    All lines of code begin or end in a curly brace.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    The statement is false because not all lines of code begin or end in a curly brace. Curly braces are used to define blocks of code, such as loops or conditional statements, but individual lines of code within those blocks do not necessarily begin or end with a curly brace.

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  • 12. 

    Curly braces are put after which portions of code:

    • Classes

    • Source File

    • Methods

    • Statements

    Correct Answer(s)
    A. Classes
    A. Methods
    Explanation
    Curly braces are put after classes and methods in code. Classes are the blueprint for creating objects, and the curly braces define the scope of the class. Methods are functions within a class, and the curly braces enclose the code block for the method. Curly braces are not typically used directly after source files or statements, although they may be used within statements to define code blocks.

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  • 13. 

    int x = 1; int num = 1; while(num < 3) {      System.out.print(x + num);      num = num + 1; } The above code would output: 2 3

    • True

    • False

    Correct Answer
    A. False
    Explanation
    We called System.out.print() instead of System.out.println(). They're similar, so be careful!

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  • 14. 

    Name the three types of variables we learned in this chapter: _____, _____, and _____.

    Correct Answer
    int
    String
    boolean
    Boolean
    Explanation
    In this chapter, we learned about three types of variables: int, String, boolean, and Boolean. The "int" type is used to store whole numbers, the "String" type is used to store text, and the "boolean" and "Boolean" types are used to store true/false values.

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Quiz Review Timeline (Updated): Mar 17, 2023 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 17, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • May 20, 2011
    Quiz Created by
    Maniacalsounds
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