Java Objective Test
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- 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
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