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