Java Quiz For Beginners

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