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Java Quiz For Beginners

93 Questions  I  By Xooxa
Java Quizzes & Trivia
It is created for Beginners in Java. This is to test the knowledge of any Java Developer wannabe.

  
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Question Excerpt

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1.  The last value in an array called ar can be found at index:
A.
B.
C.
D.
2.  The most common use of an array is to:
A.
B.
C.
D.
3.  Following code will result in: class A { public static void main(String [] args) {A a = new B(); }} class B extends A {}
A.
B.
C.
D.
4.  What is the difference between private and public functions ?
A.
B.
C.
D.
5.  Which one adds the widget mainPanel to a frame in the constructor of the frame?
A.
B.
C.
D.
6.  Object-Oriented Programming means ...  
A.
B.
C.
D.
7.  Which of the following is not a Java keyword?
A.
B.
C.
D.
8.  The default statement of a switch is always executed.
A.
B.
9.  Integer a = new Integer(2); Integer b = new Integer(2); What happens when you do if (a==b)?
A.
B.
C.
D.
10.  What does AWT stands for ?
A.
B.
C.
D.
11.  Choose the appropriate data type for this field: weightInKilos    
A.
B.
C.
D.
12.  How is the layout of widgets on a panel specified?
A.
B.
C.
D.
13.  Following code will result in: int a1 = 5; double a2 = (float)a1;
A.
B.
C.
D.
14.  What's the difference between an Applet and an application ?
A.
B.
C.
D.
15.  What loop will display each of the numbers in this array on a separate line: float [ ] nums= {1.1f, 2.2f, 3.3f};
A.
B.
C.
D.
16.  What is an assignment statement ?
A.
B.
C.
D.
17.  A null reference may be used to access a static variable or method.
A.
B.
18.  If we declare int [ ] ar = {1,2,3,4,5,6}; The size of array ar is:
A.
B.
C.
D.
19.  What is the main function of any variable ?
A.
B.
C.
D.
20.  Java runs on _______.
A.
B.
C.
D.
21.  Choose the appropriate data type for this value: "volatile"    
A.
B.
C.
D.
22.  Which is not a part of defining an object?
A.
B.
C.
D.
23.  Synchronized is a keyword to tell a Thread to grab an Object lock before continuing execution.
A.
B.
24.  What will be the value of “num” after the following statements? int num; num = (5+4); num = num / 9; num = 9;
A.
B.
C.
D.
25.  We have three classes: ATM, ATM Display and Account. The ATM has one ATM Display and works by calling methods on class Account. Which will be shown as an association in UML?
A.
B.
C.
D.
26.  Following code will result in: float num = 5/0;
A.
B.
C.
D.
27.  The range of indices for an array always start at:
A.
B.
C.
D.
28.  Class B inherits from Class A, what cannot be said:
A.
B.
C.
D.
29.  What is an Applet ?
A.
B.
C.
D.
30.  Given the declaration : int [ ] ar = {1,2,3,4,5}; What is the value of ar[3]?
A.
B.
C.
D.
31.  A UML association is ...
A.
B.
C.
D.
32.  If classes Student, Staff and Faculty extend class Person, which one makes sense:
A.
B.
C.
33.  Choose the appropriate data type for this value: 1
A.
B.
C.
D.
34.  The methods wait(), notify() and notifyAll() in Object need to be called from synchronized pieces of code.
A.
B.
35.  Choose the appropriate data type for this value: true    
A.
B.
C.
D.
36.  Following code will result in: class A { public static void main(String [] args) {B b = new A(); }} class B extends A {}
A.
B.
C.
D.
37.  With inheritance, a derived subclass object can directly access any
A.
B.
C.
D.
38.  Which of the following always need a Capital letter ?    
A.
B.
C.
D.
39.  Which one needs a web page to run
A.
B.
C.
D.
40.  What is the role of the constructor? 
A.
B.
C.
41.  Which package do you need to use widgets such as JApplet, JFrame, JPanel and JButton?
A.
B.
C.
D.
42.  An abstract class can have non-abstract methods.
A.
B.
43.  Choose the appropriate data type for this value: female    
A.
B.
C.
D.
44.  How to define a JButton with the caption test?
A.
B.
C.
D.
45.  Choose the best definition for a Class.    
A.
B.
C.
46.  Which is NOT a section of all types of loops ?
A.
B.
C.
D.
47.  A class cannot be declared:
A.
B.
C.
48.  Following code will result in: int num = 8/0;
A.
B.
C.
D.
49.  Choose the best definition of an object
A.
B.
C.
50.  What is the proper way to declare a variable ?
A.
B.
C.
D.
51.  What is a loop ?
A.
B.
C.
D.
52.  Choose the appropriate data type for this field: isSwimmer    
A.
B.
C.
D.
53.  Given the declaration int [ ] nums = {8, 12, 23, 4, 15}, what expression will display the first element in the array (ie the number 8)
A.
B.
C.
D.
54.  Choose the appropriate data type for this value: A    
A.
B.
C.
D.
55.  Java keywords are written in lowercase as well as uppercase.
A.
B.
56.  What would display from the following statements? int [ ] nums = {1,2,3,4,5,6}; System.out.println((nums[1] + nums[3]));
A.
B.
C.
D.
57.  What is essential in making sure that your loop is not infinite ?
A.
B.
C.
D.
58.  Which one adds the widget mainPanel to an applet in the init method of the applet?
A.
B.
C.
D.
59.  Inner classes can be defined within methods.
A.
B.
60.  If you want your conditional to depend on two conditions BOTH being true, what is the proper notation to put between the two Boolean statements ?
A.
B.
C.
D.
61.  A class can be transient
A.
B.
62.  Following code will result in: class A { int x = 1; public static void main(String [] args) { System.out.println("x is " + x); }}
A.
B.
C.
D.
63.  Given the declaration : int [ ] ar = {1,2,3,4,5}; What is the value of ar[4]?
A.
B.
C.
D.
64.  If class A implements an interface does it need to implement all methods of that interface?
A.
B.
65.  Which of the following means that in order for the conditional to happen, either x must be less than 3 or y must be greater than or equal to 4 ?
A.
B.
C.
D.
66.  In a ‘for’ loop, what section of the loop is not included in the parentheses after “for” ?
A.
B.
C.
D.
67.  Native methods can be 'abstract'
A.
B.
68.  Choose the appropriate data type for this field: numberOfEggs    
A.
B.
C.
D.
69.  What is an instanceof?
A.
B.
C.
D.
70.  What is the correct syntax for java main method?
A.
B.
C.
D.
71.  What is a member of a class
A.
B.
C.
D.
72.  Following code will result in: int num = 6.7;
A.
B.
C.
D.
73.  A class is...
A.
B.
C.
D.
74.  Choose the appropriate data type for this value: 5.5    
A.
B.
C.
D.
75.  The size of an applet is set using ...
A.
B.
C.
D.
76.  An array holds:
A.
B.
C.
D.
77.  Primitive datatypes are allocated on a stack.
A.
B.
78.  Can you compare a boolean to an integer?
A.
B.
79.  How can you prevent a member variable from becoming serialized?
A.
B.
C.
D.
80.  Choose the appropriate data type for this field: kindOfBird    
A.
B.
C.
D.
81.  If none of the private/protected/public is specified for a member, that member ...
A.
B.
C.
D.
82.  What is the keyword used in java to create an object?
A.
B.
C.
D.
83.  Choose the appropriate data type for this value: "1"    
A.
B.
C.
D.
84.  What does GUI stand for?
A.
B.
C.
D.
85.  Methods that are marked protected can be called in any subclass of that class.
A.
B.
86.  A UML association from class A to class B means
A.
B.
C.
D.
87.  The size of a frame is set using ...
A.
B.
C.
D.
88.  Which one could be used as the main container in a Java application?
A.
B.
C.
D.
89.  Which one is not correct?
A.
B.
C.
D.
90.  An object could be ...
A.
B.
C.
D.
91.  What displays from the following statements? String word = "abcde"; for (int i = 0; i <4; i+=2) System.out.print(word[i]);
A.
B.
C.
D.
92.  The following prototype shows that a Cylinder subclass is derived from a superclass called Circle
A.
B.
C.
D.
93.  What is the size of a Char in Java?
A.
B.
C.
D.
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