Java Programming Basics and Errors
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Java Programming Basics and Errors

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Questions and Answers

What is the term used to describe an error causing a program to take an action that the programmer did not intend?

  • Compile-time error
  • Run-time error (correct)
  • Syntax error
  • Typo

    • A __________ contains sequences of programming instructions that describe how to perform a particular task.

    method

    What is a logic error?

    A program that is syntactically correct but does not do what it is supposed to do.

    What is the name of the file generated by the Java compiler?

    <p>FunTime.class</p> Signup and view all the answers

    A(n) __________ is a software package that provides an editor, a compiler, and other programming tools.

    <p>IDE</p> Signup and view all the answers

    In a flowchart, the __________ is used to represent processing.

    <p>parallelogram</p> Signup and view all the answers

    Given the public class name GroceryStore and filename grocerystore.java, which statement is correct?

    <p>The program will successfully compile and run if there are no syntax errors in it.</p> Signup and view all the answers

    Java source code files end with file extension __________.

    <p>java</p> Signup and view all the answers

    Is an installation program required for Eclipse, or can it be extracted from a zip file?

    <p>Eclipse can be extracted from a zip file, an installer is optional.</p> Signup and view all the answers

    What console command is used to display the version of the Java runtime environment installed?

    <p>java -version</p> Signup and view all the answers

    What is the output of the following code: int num1 = 6; int num2 = 10; num1 = num2; num2 = num1; System.out.println(num1 + ',' + num2);

    <p>10, 10</p> Signup and view all the answers

    Which line of code correctly uses the assignment operator, given: int total;

    <p>total = 1 + 3;</p> Signup and view all the answers

    Which of the following identifiers will compile in Java?

    <p>dog1</p> Signup and view all the answers

    Which line of code correctly uses a method, given: int myNumber;

    <p>System.out.println(&quot;My number is &quot; + myNumber);</p> Signup and view all the answers

    If the values of 2.5 and "Hello" were sent in that specific order to a method, which method would be used?

    <p>void printValues(double value1, String value2)</p> Signup and view all the answers

    What is assigned to the variable associated with an object of type Car created in the main() method?

    <p>a reference to the object</p> Signup and view all the answers

    What Java package provides classes that are used in all Java programs?

    <p>java.lang</p> Signup and view all the answers

    Which of the following is not a way to create a breakpoint in Eclipse?

    <p>Use the file menu and select preferences</p> Signup and view all the answers

    When debugging in Eclipse to end the debugging session immediately we can use the __________ button.

    <p>Terminate</p> Signup and view all the answers

    Which debugging in Eclipse command is most commonly used to follow program execution line-by-line?

    <p>Step Into</p> Signup and view all the answers

    The access specifier in the declaration of instance variables should be __________.

    <p>private</p> Signup and view all the answers

    Study Notes

    Common Programming Errors

    • Run-time Error: An error that causes a program to take an unintended action.
    • Logic Error: A program that is written correctly but does not function as expected.

    Java Programming Basics

    • Method: Sequences of programming instructions that perform a specific task.
    • IDE (Integrated Development Environment): A software package providing tools like editors, compilers, and debuggers.
    • Flowcharts: Use parallelograms to represent processing.
    • Java Source Code Files: End with the file extension "java".
    • Java Compilation: Compiles into a "class" file.
    • Java Version Check: Use the command "java -version" to display the version.
    • File Naming Conventions: The public class name must match the filename, even in capitalization.

    Java Syntax and Data Types

    • Variables: Hold data values.
    • Assignment Operator ("="): Sets a variable to a value. Example: total = 1 + 3
    • Identifiers: Names given to variables, methods, and classes.
    • Valid Identifiers: Must start with a letter or underscore, and can contain letters, digits, and underscores.

    Calling Methods and Parameters

    • Method Calls: Use the method name followed by parentheses. Example: System.out.println.
    • Parameters: Values passed to methods to modify their behavior.

    Objects and Classes

    • Objects: Encapsulate data and methods.
    • Creating Objects: Use the "new" keyword.
    • Object References: Variables hold references to objects.
    • Java Packages: Provide classes for common functionality:
      • java.lang: Provides core classes used in all Java programs.
      • java.util: Contains classes like arrays, maps, and lists.

    Debugging in Eclipse

    • Breakpoints: Pause program execution at specific lines.
    • Toggle Breakpoint: Add or remove breakpoints in Eclipse.
    • Debugging Commands:
      • Step Into: Execute a line of code within a method.
      • Step Over: Execute a line of code, skipping any method calls.
      • Step Return: Execute a line of code, returning from a method.
      • Terminate: End the debugging session.

    Access Modifiers

    • Private: Access restricted to the class itself.
    • Public: Access allowed from any location.
    • Protected: Access for the class, subclasses, and packages.

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    Description

    This quiz covers essential concepts in Java programming, including common programming errors such as run-time and logic errors. It also delves into the basics of Java, including methods, IDEs, flowcharts, and syntax. Test your knowledge on Java's foundational elements and its error handling!

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