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Java Quiz For Beginners

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