Java Programming Basics Quiz
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Questions and Answers

What is the purpose of the if statement 'if (sum >= num && cnt < num)'?

  • To verify that sum is equal to num and cnt is equal to num
  • To determine if both sum and cnt are less than num
  • To check if sum is less than num and cnt is greater than num
  • To evaluate if sum is greater than or equal to num and cnt is smaller than num (correct)

What will be the output when 'System.out.println(data1);' executes given 'chat data1 = 65;'?

  • The output will be 65
  • The output will be an exception
  • A compilation error occurs due to 'chat' being an invalid data type (correct)
  • The output will be 0

Which code correctly initializes a short variable from a string representation?

  • short data = 65;
  • short data = Short.parseShort('65'); (correct)
  • short data = Short.parseShort('65.0');
  • short data = new Short('65.0');

What is the result when executing 'System.out.println(data3);' with 'float data3 = new Float("-65.0");'?

<p>The output will be -65.0 (D)</p> Signup and view all the answers

How should a multi-line comment be correctly structured in Java?

<p>/* This is a multi-line comment */ (C)</p> Signup and view all the answers

What happens when you attempt to print an undeclared variable like 'data4'?

<p>A compilation error occurs due to undeclared variable (D)</p> Signup and view all the answers

In the context of exception handling, what would happen if the code contains an arithmetic operation that results in division by zero?

<p>An ArithmeticException is thrown at runtime (A)</p> Signup and view all the answers

Which statement correctly maintains the original array element when exiting a loop?

<p>Keeping a reference to the original array element (C)</p> Signup and view all the answers

What is the final value of x after executing the following code? int x = 50; x += 100 % 5 + 10 * 2;

<p>110 (A)</p> Signup and view all the answers

Which classes can invoke the logError method from the Logger class?

<p>All classes in all packages (B)</p> Signup and view all the answers

Given the constructor for Rectangle takes length and width as arguments, which line correctly creates an instance named cert1?

<p>Rectangle cert1 = new Rectangle(10, 20); (A)</p> Signup and view all the answers

What must be handled in the catch block for file handling exceptions?

<p>Print the exception message (B)</p> Signup and view all the answers

What is the correct way to complete the catch blocks for handling exceptions in Java?

<p>catch (FileNotFoundException e) { ... } (B), catch (IOException e) { ... } (C)</p> Signup and view all the answers

Which of the following statements about the Logger class is false?

<p>It cannot be accessed outside its package. (C)</p> Signup and view all the answers

What would be the appropriate behavior in the second catch block if an exception occurs that is not a file handling error?

<p>Display the stack trace (D)</p> Signup and view all the answers

What is the significance of using constructors in classes such as Rectangle?

<p>They initialize objects with required values. (B)</p> Signup and view all the answers

What will be the result of the code when trying to compute the fraction?

<p>Exception due to java.lang.ArithmeticException / by Zero (B)</p> Signup and view all the answers

What kind of exception will be thrown when trying to access an index out of bounds in an array?

<p>ArrayIndexOutOfBoundsException (B)</p> Signup and view all the answers

Which statement correctly describes the purpose of a labeled break in nested loops?

<p>It terminates the nearest outer loop. (B)</p> Signup and view all the answers

What happens when the continue statement is executed in a loop?

<p>It skips the rest of the code in the current iteration. (D)</p> Signup and view all the answers

Within the given code, which line purposely causes an error after division?

<p>g = 100; (D)</p> Signup and view all the answers

Which exception type is the catch block for RuntimeException actually designed to handle?

<p>Any unchecked exception (A)</p> Signup and view all the answers

In Java, what type of error does the statement 'g[10]' attempt to invoke in the provided code?

<p>ArrayIndexOutOfBoundsException (C)</p> Signup and view all the answers

What is the output if the method would have been executed with valid divisor instead of zero?

<p>The fractional part result : 20 (C)</p> Signup and view all the answers

Flashcards

ArithmeticException in Java

Thrown when an arithmetic operation such as division by zero occurs.

ArrayIndexOutOfBoundsException

Thrown when an array is accessed with an index that is outside its bounds.

unlabeled break statement

Terminates the innermost enclosing loop.

labeled break statement

Terminates a specified loop by using an identifier.

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continue statement

Skips the remaining code in the current loop iteration and proceeds to the next.

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nested loop

A loop inside another loop.

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try-catch block

A block of code used to handle exceptions.

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exception handling

The process of responding to exceptional conditions that occur during program execution.

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Conditional Statement (if)

An if statement in Java executes a block of code only if a specified condition is true.

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Boolean Expression

An expression that evaluates to either true or false in Java.

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Comparison Operators

Operators that compare values and return a boolean result. Examples include > (greater than), >= (greater than or equal to), < (less than), <= (less than or equal to), ==(equal to).

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Multi-line comment

Used for longer comment explanations (text explaining the code) in Java that spans multiple lines.

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Primitive Type: int

A simple data type that stores whole numbers.

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Primitive Type: long

A data type that stores larger whole numbers than int.

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Primitive Type: float

Stores floating-point numbers.

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Data Type Conversion Error

Attempting to assign a value incompatible with a data type will result in an error (e.g., converting a decimal to a whole number type will cause an issue)

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Java code snippet output

Calculates an expression with assignments, using modulo, addition, and multiplication, and prints the resulting value to the console.

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Java Logger class access

The logError method within the Logger class can be invoked from any class, regardless of their package or inheritance relationship with the Logger class.

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Rectangle class instantiation

Creating an instance of the Rectangle class requires using the constructor, which takes length and width as parameters. e.g. Rectangle cert1 = new Rectangle(length, width);

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Exception handling - File

The try-catch block helps manage exceptions during file handling operations.

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Exception handling - General

Exception handling ensures the application runs smoothly, displaying exceptions based on appropriate conditions. Exceptions can be handled differently to provide more info. For instance, if the error involves a file, the program can display specific file errors; otherwise, it can present general error messages and stack traces.

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Study Notes

ITS Certification (Java) Review Session

  • The Information Technology Specialist program validates entry-level IT skills employers seek.
  • The IT Specialist program targets candidates considering or beginning a career in IT.
  • Students can earn certification in various IT topics, including software development, database administration, networking, security, mobility, and device management.
  • The Java examination targets application developers using Java 6 SE or later.
  • Secondary and immediate post-secondary students, and entry-level software developers are also test candidates.

Exam Coverage: Java Fundamentals

  • Topics covered include Java fundamentals, data types, variables, expression evaluation, flow control implementations, object-oriented programming, code compilation, and debugging.

Exam Coverage: HTML and CSS

  • The exam covers Java, covering fundamentals, data types and variables, flow control implementations, object oriented programming, and code compilation/debugging.

Exam: ITS Java and HTML/CSS

  • The Java and HTML/CSS exam contains 40 multiple-choice questions.
  • The exam has a time limit of up to 50 minutes.

Review Questions: Exception Handling

  • Evaluate the exception: Exception in thread “main” java.lang.ArrayIndexOutOfBoundsException: 5
  • Analyze if statements for truth or falsity regarding the exception's origin and the methods invocations that led to it.

Review Questions: Code Evaluation

  • Review code snippets to determine the expected output.
    • Identify the causes of errors or exceptions that may occur in the code using try...catch block

IT Specialist: Java Review: Branching Statements

  • To terminate the inner loop of a nested loop -> unlabeled break
  • To terminate the outer loop use labeled break statement
  • For jumping to the next iteration in a loop use continue statement

IT Specialist: Java Review: Age Classification

  • Create a Java method (ageClassification) that takes an integer (age) as input.
  • Assign "senior" if age is 65 or higher.
  • Assign "adult" if age is 20 or greater but less than 65.
  • Assign "youth" for ages less than 20.

IT Specialist: Java Review: Code Execution Output

  • Evaluate code to predict output, focusing on array indexing, arithmetic exceptions, and runtime exceptions.

IT Specialist: Java Review: Object-Oriented Principles

  • Assess if a class design allows inheritance and access modifiers.

IT Specialist: Java Data Structures

  • Understand and practice how to use arrays and data structures such as ArrayList in Java.

ITS Review: Concepts of Java Programming

  • Review the concepts and features involved in Java programing.

The Book: Java Programming (Data Members)

  • The program has title, author, year, and isbn data members (as Strings and integers).
  • The default constructor creates empty string values for title and author, and zero values for year and isbn..

IT Specialist: Java Review Question: Code Segments Analysis

  • Analyzing a provided code segment to determine if a compilation error will occur, and if the error will appear in one code block or non-nested code blocks

IT Specialist: Java Review: Error Handling

  • Understanding try-catch blocks to determine how exceptions are handled.

IT Specialist Java: Evaluation of Classes

  • Evaluating a class using protected data members and checking if other classes are accessing the members

IT Specialist Java: Method Evaluation

  • Evaluating a method for its output.

IT Specialist Java: Code Analysis and Output

  • Analyze provided Java code snippets or segments to determine expected output, including any exceptions thrown and the exact order of print statements.

IT Specialist Java : Byte Value Example and Data Types

  • Evaluating code with byte data type and common data types like float and double in a given Java code.

IT Specialist Java: Two-Dimensional Array and Output

  • Describe the procedure to print elements of a two-dimensional integer array.

IT Specialist Java : Inheritance and Constructors

  • Understand how constructor of class inherits properties to implement it.

IT Specialist: Java Exception Handling (IO and Others)

  • Understand the appropriate handling of different types of exceptions, such as IOException and Exception

IT Specialist: Java Method: Countdown

  • Implement a Java method (countdown) to display numbers from a given start number down to 0.

IT Specialist: Java Command-line arguments

  • Understand how a Java program can accept command-line arguments and handle them.

IT Specialist: Java: Methods and Data Members

  • Understanding how to implement java classes and methods involving protected and final keywords.

IT Specialist Java: Review of Scholarship Calculation Method

  • Analyze and evaluate the provided Java method (calculateAward), to accurately determine the scholarship amount based on GPA, SAT Score, and ACT Score input criteria/conditionals.

IT Specialist: Additional Java Concepts

  • Reviewing additional Java fundamental concepts, like string concatenation, and the use of different data types.

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ITS Certification (Java) Review PDF

Description

Test your knowledge on fundamental concepts of Java programming, including the use of if statements, variable initialization, exception handling, and array manipulation. This quiz challenges your understanding of syntax, variable types, and error handling within Java code.

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