Java Quiz For Beginners

93 Questions  I  By Xooxa
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 is the proper way to declare a variable ?
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B.
C.
D.
2.  Choose the appropriate data type for this value: A    
A.
B.
C.
D.
3.  A class can be transient
A.
B.
4.  What loop will display each of the numbers in this array on a separate line: float [ ] nums= {1.1f, 2.2f, 3.3f};
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B.
C.
D.
5.  A null reference may be used to access a static variable or method.
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B.
6.  Which one adds the widget mainPanel to a frame in the constructor of the frame?
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B.
C.
D.
7.  Choose the appropriate data type for this field: numberOfEggs    
A.
B.
C.
D.
8.  Choose the appropriate data type for this field: weightInKilos    
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B.
C.
D.
9.  How to define a JButton with the caption test?
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B.
C.
D.
10.  Object-Oriented Programming means ...  
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B.
C.
D.
11.  Choose the appropriate data type for this field: isSwimmer    
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B.
C.
D.
12.  Primitive datatypes are allocated on a stack.
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B.
13.  Which one needs a web page to run
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B.
C.
D.
14.  Choose the best definition for a Class.    
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B.
C.
15.  An object could be ...
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B.
C.
D.
1 comment
16.  The following prototype shows that a Cylinder subclass is derived from a superclass called Circle
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B.
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D.
17.  Following code will result in: int num = 8/0;
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B.
C.
D.
18.  Choose the appropriate data type for this value: true    
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B.
C.
D.
19.  Following code will result in: class A { public static void main(String [] args) {A a = new B(); }} class B extends A {}
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B.
C.
D.
20.  Methods that are marked protected can be called in any subclass of that class.
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B.
2 comments
21.  Which one is not correct?
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B.
C.
D.
22.  What is the main function of any variable ?
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D.
23.  Which is not a part of defining an object?
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B.
C.
D.
24.  What is an Applet ?
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B.
C.
D.
25.  Following code will result in: int num = 6.7;
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B.
C.
D.
26.  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.
27.  Which is NOT a section of all types of loops ?
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B.
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D.
28.  With inheritance, a derived subclass object can directly access any
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D.
29.  If we declare int [ ] ar = {1,2,3,4,5,6}; The size of array ar is:
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B.
C.
D.
30.  Choose the appropriate data type for this value: "1"    
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B.
C.
D.
1 comment
31.  Class B inherits from Class A, what cannot be said:
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B.
C.
D.
1 comment
32.  What displays from the following statements? String word = "abcde"; for (int i = 0; i <4; i+=2) System.out.print(word[i]);
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B.
C.
D.
33.  What does AWT stands for ?
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B.
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D.
34.  Java runs on _______.
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D.
35.  Following code will result in: class A { int x = 1; public static void main(String [] args) { System.out.println("x is " + x); }}
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B.
C.
D.
36.  What is the keyword used in java to create an object?
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D.
37.  What is a loop ?
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B.
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D.
38.  Native methods can be 'abstract'
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B.
39.  Inner classes can be defined within methods.
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B.
1 comment
40.  The methods wait(), notify() and notifyAll() in Object need to be called from synchronized pieces of code.
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B.
41.  How can you prevent a member variable from becoming serialized?
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D.
42.  Which package do you need to use widgets such as JApplet, JFrame, JPanel and JButton?
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B.
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D.
43.  Choose the appropriate data type for this value: "volatile"    
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B.
C.
D.
44.  What is a member of a class
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B.
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D.
45.  The size of an applet is set using ...
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B.
C.
D.
46.  An abstract class can have non-abstract methods.
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B.
47.  A UML association is ...
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B.
C.
D.
48.  The default statement of a switch is always executed.
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B.
49.  Choose the appropriate data type for this value: female    
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B.
C.
D.
50.  What is the role of the constructor? 
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B.
C.
51.  The range of indices for an array always start at:
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B.
C.
D.
52.  Choose the appropriate data type for this value: 5.5    
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B.
C.
D.
53.  A class is...
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D.
54.  Given the declaration : int [ ] ar = {1,2,3,4,5}; What is the value of ar[3]?
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B.
C.
D.
55.  How is the layout of widgets on a panel specified?
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B.
C.
D.
1 comment
56.  If class A implements an interface does it need to implement all methods of that interface?
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B.
57.  If none of the private/protected/public is specified for a member, that member ...
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B.
C.
D.
58.  Which of the following always need a Capital letter ?    
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B.
C.
D.
2 comments
59.  What is the difference between private and public functions ?
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B.
C.
D.
60.  If classes Student, Staff and Faculty extend class Person, which one makes sense:
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B.
C.
61.  What is the correct syntax for java main method?
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C.
D.
62.  Choose the appropriate data type for this value: 1
A.
B.
C.
D.
63.  An array holds:
A.
B.
C.
D.
5 comments
64.  What is an instanceof?
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B.
C.
D.
65.  Following code will result in: class A { public static void main(String [] args) {B b = new A(); }} class B extends A {}
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B.
C.
D.
66.  Which of the following is not a Java keyword?
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B.
C.
D.
67.  Can you compare a boolean to an integer?
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B.
68.  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 ?
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B.
C.
D.
2 comments
69.  Synchronized is a keyword to tell a Thread to grab an Object lock before continuing execution.
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B.
70.  Java keywords are written in lowercase as well as uppercase.
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B.
71.  Choose the appropriate data type for this field: kindOfBird    
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B.
C.
D.
72.  What is an assignment statement ?
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B.
C.
D.
73.  What will be the value of “num” after the following statements? int num; num = (5+4); num = num / 9; num = 9;
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B.
C.
D.
74.  A class cannot be declared:
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B.
C.
75.  What does GUI stand for?
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B.
C.
D.
76.  The size of a frame is set using ...
A.
B.
C.
D.
77.  The most common use of an array is to:
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B.
C.
D.
78.  Integer a = new Integer(2); Integer b = new Integer(2); What happens when you do if (a==b)?
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B.
C.
D.
2 comments
79.  What's the difference between an Applet and an application ?
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B.
C.
D.
80.  The last value in an array called ar can be found at index:
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B.
C.
D.
81.  What is essential in making sure that your loop is not infinite ?
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B.
C.
D.
82.  What is the size of a Char in Java?
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B.
C.
D.
83.  Which one could be used as the main container in a Java application?
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B.
C.
D.
84.  Given the declaration int [ ] nums = {8, 12, 23, 4, 15}, what expression will display the first element in the array (ie the number 8)
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B.
C.
D.
85.  Which one adds the widget mainPanel to an applet in the init method of the applet?
A.
B.
C.
D.
86.  In a ‘for’ loop, what section of the loop is not included in the parentheses after “for” ?
A.
B.
C.
D.
87.  Following code will result in: float num = 5/0;
A.
B.
C.
D.
88.  What would display from the following statements? int [ ] nums = {1,2,3,4,5,6}; System.out.println((nums[1] + nums[3]));
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B.
C.
D.
89.  Given the declaration : int [ ] ar = {1,2,3,4,5}; What is the value of ar[4]?
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B.
C.
D.
90.  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?
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B.
C.
D.
91.  Choose the best definition of an object
A.
B.
C.
92.  A UML association from class A to class B means
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B.
C.
D.
93.  Following code will result in: int a1 = 5; double a2 = (float)a1;
A.
B.
C.
D.
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