Java Objective Test

30 Questions | Total Attempts: 328

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Java Objective Test

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Questions and Answers
  • 1. 
    Object-Oriented Programming means ...  
    • A. 

      Being objective about what you develop

    • B. 

      Designing the application based on the objects discovered when analysing the problem

    • C. 

      Writing an algorithm before writing your program and having a test plan

    • D. 

      Writing a program composed of Java classes

  • 2. 
    If none of the private/protected/public is specified for a member, that member ...
    • A. 

      Is accessible publicly

    • B. 

      Is only accessible by other classes of the same package

    • C. 

      Is only accessible from within the class

    • D. 

      Is accessible by the class and its subclasses

  • 3. 
    Which one is not correct?
    • A. 

      A class needs to be instantiated as an object before being used

    • B. 

      An objects exists in memory in run time

    • C. 

      Class and object are just different names for the same thing

    • D. 

      An object is a variable, where its type is the class used to declare the variable

  • 4. 
    Which is not a part of defining an object?
    • A. 

      Description

    • B. 

      Methods

    • C. 

      Associations with other objects

    • D. 

      Name

  • 5. 
    Class B inherits from Class A, what cannot be said:
    • A. 

      B is a sub-class of A

    • B. 

      A is a super-class of B

    • C. 

      B has access to private members of A

    • D. 

      B has access to protected members of A

  • 6. 
    What is a member of a class
    • A. 

      An attribute

    • B. 

      A method

    • C. 

      Attribute or method

    • D. 

      A sub-class

  • 7. 
    A UML association from class A to class B means
    • A. 

      Class B inherits from Class A

    • B. 

      Class B is defined within class A

    • C. 

      Class B has an attribute of type A

    • D. 

      Class A has an attribute of type B

  • 8. 
    A UML association is ...
    • A. 

      Implemented as a Java attribute member

    • B. 

      Implemented as a Java method

    • C. 

      Implemented as a sub-class

    • D. 

      Implemented as a String constructor returning the name of the association target

  • 9. 
    An object could be ...
    • A. 

      Anything

    • B. 

      An algorithm

    • C. 

      A data container

    • D. 

      A program

  • 10. 
    A class is...
    • A. 

      An object

    • B. 

      An executable piece of code

    • C. 

      An abstract definition of an object

    • D. 

      A varibale

  • 11. 
    The size of a frame is set using ...
    • A. 

      The method setSize()

    • B. 

      Automtically in run-time

    • C. 

      The width and height attributes of the class JFrame

    • D. 

      WIDTH and HEIGHT properties of the window menu in Eclipse

  • 12. 
    Which package do you need to use widgets such as JApplet, JFrame, JPanel and JButton?
    • A. 

      Javax.swing

    • B. 

      Javax.gui

    • C. 

      Java.awt

    • D. 

      Java.swing

  • 13. 
    Which one needs a web page to run
    • A. 

      A Java Application

    • B. 

      A Java Stand-Alone Application

    • C. 

      A Java Applet

    • D. 

      A Java Class

  • 14. 
    What does GUI stand for?
    • A. 

      Graphical User Interface

    • B. 

      Gimme Ur Internet

    • C. 

      Grand User Interface

    • D. 

      Graphical Useful Interface

  • 15. 
    How is the layout of widgets on a panel specified?
    • A. 

      Automatically

    • B. 

      By inheriting from the main container such as a JFrame or JApplet

    • C. 

      By calling the method setLayout

    • D. 

      By calling the method setContentPane

  • 16. 
    Which one adds the widget mainPanel to a frame in the constructor of the frame?
    • A. 

      Add(this.mainPanel);

    • B. 

      This.add(mainPanel);

    • C. 

      MainPanel.setVisible(true);

    • D. 

      GetContentPane().add(mainPanel);

  • 17. 
    Which one could be used as the main container in a Java application?
    • A. 

      JApplet

    • B. 

      JFrame

    • C. 

      JPanel

    • D. 

      JButton

  • 18. 
    How to define a JButton with the caption test?
    • A. 

      JButton aButton('test');

    • B. 

      JButton aButton=new JButton("test");

    • C. 

      JButton aButton=new JButton('test');

    • D. 

      JButton("test") aButton;

  • 19. 
    Which one adds the widget mainPanel to an applet in the init method of the applet?
    • A. 

      Add(mainPanel);

    • B. 

      This.add(mainPanel);

    • C. 

      MainPanel.setVisible(true);

    • D. 

      GetContentPane().add(mainPanel);

  • 20. 
    The size of an applet is set using ...
    • A. 

      The method setSize()

    • B. 

      Automtically in browser

    • C. 

      The width and height attributes of the class JApplet

    • D. 

      HTML properties WIDTH and HEIGHT of the APPLET tag.

  • 21. 
    The last value in an array called ar can be found at index:
    • A. 

      0

    • B. 

      1

    • C. 

      Ar.length

    • D. 

      Ar.length - 1

  • 22. 
    What would display from the following statements? int [ ] nums = {1,2,3,4,5,6}; System.out.println((nums[1] + nums[3]));
    • A. 

      6

    • B. 

      2+4

    • C. 

      1+3

    • D. 

      4

  • 23. 
    What loop will display each of the numbers in this array on a separate line: float [ ] nums= {1.1f, 2.2f, 3.3f};
    • A. 

      For (int i =0; i < 3; i++) System.out.println( nums[i]);

    • B. 

      For (i = 1; i

    • C. 

      For (i = 0; i

    • D. 

      For (i = 1; i < 3; i++) System.out.println(nums[i]);

  • 24. 
    What displays from the following statements? String word = "abcde"; for (int i = 0; i <4; i+=2) System.out.print(word[i]);
    • A. 

      Ab

    • B. 

      Ac

    • C. 

      Ace

    • D. 

      Bd

  • 25. 
    Given the declaration : int [ ] ar = {1,2,3,4,5}; What is the value of ar[3]?
    • A. 

      2

    • B. 

      3

    • C. 

      4

    • D. 

      5