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Java Quiz For Beginners

93 Questions  I  By Xooxa
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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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Question Excerpt

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