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