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