Java Exam 6.3 Flashcards
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Questions and Answers

What are fields and methods declared without the keyword static called?

  • Instance Fields and Methods (correct)
  • Non-static Fields and Methods
  • Static Fields and Methods
  • Class Fields and Methods

    • When an object is created, what does it contain?

    Each object will have its own instance of non-static fields and non-static methods.

    Instance fields and methods require an object to be created in order to be used.

    True

    What is the purpose of grouping methods?

    <p>To organize code and make it more flexible.</p> Signup and view all the answers

    How do you make code more usable in Java?

    <p>Place fields along with the methods that process them in a separate class with no main().</p> Signup and view all the answers

    What determines how code is shared across classes?

    <p>Whether fields and methods are instance or non-instance class members.</p> Signup and view all the answers

    What does extensible language refer to in Java?

    <p>The ability to declare new classes as needed.</p> Signup and view all the answers

    What is the format of a class declaration in Java?

    <p>public class NameOfClass { }</p> Signup and view all the answers

    Some variables can only be considered fields (class-level) and others must be local (method-level).

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

    What are fields used by static methods required to be?

    <p>Static.</p> Signup and view all the answers

    What do static/non-instance members of a class belong to?

    <p>The class during program execution.</p> Signup and view all the answers

    Instance members of a class are static.

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

    What are methods in the context of classes?

    <p>Instance methods that process data.</p> Signup and view all the answers

    What are fields in Java?

    <p>Instance variables that store data.</p> Signup and view all the answers

    How are instance members carried in a program?

    <p>With an object of a class.</p> Signup and view all the answers

    Non-static/instance methods can call static methods in another class without creating an object.

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

    What is the format for declaring a non-static instance?

    <p>NameOfClass objectName = new NameOfClass();</p> Signup and view all the answers

    What are class members?

    <p>Fields and methods of a class.</p> Signup and view all the answers

    What does 'Scanner input = new Scanner(System.in);' illustrate?

    <p>The instantiation of an object for the Scanner class.</p> Signup and view all the answers

    Can multiple instances of the same class run at the same time?

    <p>Yes.</p> Signup and view all the answers

    Each instance of a class has a unique set of fields and methods.

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

    Can instances of a class be declared in different programs?

    <p>Yes.</p> Signup and view all the answers

    What are fields and methods of a class considered?

    <p>Class members.</p> Signup and view all the answers

    Study Notes

    Instance Fields and Methods

    • Instance fields and methods are declared without the keyword static, specific to individual objects of a class.
    • Each object created has its own unique instance of non-static fields and methods.

    Object Creation

    • Instance fields and methods require object instantiation to be utilized.

    Code Organization

    • Methods facilitate organizing code for specific tasks, enhancing code flexibility and reusability.

    Sharing Code Across Classes

    • Code sharing among classes depends on whether fields and methods are declared as instance or non-instance class members.

    Extensibility of Java

    • Java is considered an extensible language, allowing for the declaration of new classes as necessary.

    Class Declaration

    • Class format: public class NameOfClass { }, must be saved with a .java extension, matching the class name.

    Variable Scope

    • Variables can be class-level fields or method-level local variables.

    Static Methods

    • Fields accessed by static methods must be static; static methods and fields are non-instance class members.

    Characteristics of Static Members

    • Static or non-instance members belong to the class during execution and are invoked using the class name or an object.

    Instance Members Characteristics

    • Instance members are non-static and associated with individual object instances of a class.

    Methods and Fields

    • Instance methods process data and perform functions, while instance fields are variables that store data.

    Instance Members Details

    • Instance members carry with an object as used, permitting multiple instances with each having its own set of fields and methods.

    Calling Methods

    • Non-static methods can invoke both static and non-static methods within the same class.

    Method Calling Context

    • Non-static methods need to be called through an object of the class; instantiation is necessary for accessing instance members.

    Format for Instance Method Creation

    • Creating an instance: NameOfClass objectName = new NameOfClass();
    • Optionally include parameters: NameOfClass objectName = new NameOfClass(argN, argM);

    Class Members Definition

    • All fields and methods, regardless of being static or non-static, are classified as class members.

    Scanner Class Instantiation

    • Instantiating two Scanner objects demonstrates that multiple instances of the same class can operate concurrently, each referred to by its distinct reference variable (e.g., input, keyboard).

    Instance Relationships

    • Each instance possesses identical fields and methods; however, each set is unique to its respective instance.

    Instance Declaration Scope

    • Instances can be declared within the same program or across different programs running simultaneously on the same system.

    Class Members Summary

    • All fields and methods of a class, as class members, contribute to the overall structure and functionality of the class.

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    Description

    Test your knowledge of Java instance fields and methods with these flashcards. This quiz focuses on key concepts of object-oriented programming in Java, including the differences between static and non-static members. Perfect for visual learners looking to reinforce their understanding.

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