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Java Basics Quiz

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JAVA Basics Quiz

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java Basics Quiz
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1. What is float datatype?
It can accept decimal numbers for assignments only It can accept decimal numbers for assignments, and occupies 4 bytes per variable It can accept decimal numbers for assignments and occupies 8 bytes per variable It is not a primitive datatype
2. Which Feature of OOP illustrated the code reusability?
Polymorphism Abstraction Encapsulation Inheritance
3. Which of the following best defines a class?
Parent of an object Instance of an object Blueprint of an object Scope of an object
4. What is the additional feature in classes that was not in structures?
Data members Member functions Static data allowed Public access specifier
5. Which of the two features match each other?
Inheritance and Encapsulation Encapsulation and Polymorphism Encapsulation and Abstraction Abstraction and Polymorphism
6. If same message is passed to objects of several different classes and all of those can respond in a different way, what is this feature called?
Inheritance Overloading Polymorphism Overriding
7. Which feature can be implemented using encapsulation?
Inheritance Abstraction Polymorphism Overloading
8. Which among the following best describes encapsulation?
It is a way of combining various data members into a single unit It is a way of combining various member functions into a single unit It is a way of combining various data members and member functions into a single unit which can operate on any data It is a way of combining various data members and member functions that operate on those data members into a single unit
9. Java allow , Same java program program to be executed on multiple operating systems.
True False
10. Which is the correct flow?
bytecode, javac, .java, interpreter javac, .java, interpreter, bytecode interpreter, .java, javac, bytecode .java, javac, bytecode, interpreter
11. Which are the compatible Data Types for Type Promotion or Type Casting?
byte, char, short char, int, float float, long, double All the above
12. What is the output of the below Java code snippet?char ch = 'A'; int a = ch +1; ch = (char)a; System.out.println(ch)
66 A B 65
13. From which index does the array of objects start?
0 1 2 3
14. What is the type of elements of array of objects?
Class Void String Null
15. In Java arrays are
Objects Object references Primitive data type None of the above
16. Which one of the following is a valid statement?
char[] c = new char(); char[] c = new char[5]; char[] c = new char(4); char[] c = new char[];
17. Which among the following is true?
The pointer to object can hold address only The pointer can hold value of any type The pointer can hold only void reference The pointer can’t hold any value
18. Which access specifier is used when no access specifier is used with a member of class (java)?
Private Default Protected Public
19. Which specifier allows a programmer to make the private members which can be inherited?
Private Default Protected Protected and default
20. Which among the following is correct?
class student{ public: int student(){} }; class student{ public: void student (){} }; class student{ public: student{}{} }; class student{ public: student(){} };
21. Which among the following best describes constructor overloading?
Defining one constructor in each class of a program Defining more than one constructor in single class Defining more than one constructor in single class with different signature Defining destructor with each constructor
22. Which is correct syntax for creating objects?
classname objectname= new() integer; classname objectname= new classname; classname objectname= new classname(); classname objectname= new() classname();
23. Which among the following best defines static variables members?
Data which is allocated for each object separately Data which is common to all the objects of a class Data which is common to all the classes Data which is common to a specific method
24. The static members are
Created with each new object Created twice in a program Created as many times a class is used Created and initialized only once
25. How can you make the private members inheritable?
By making their visibility mode as public only By making their visibility mode as protected only By making their visibility mode as private in derived class It can be done both by making the visibility mode public or protected
26. Which is the correct syntax of inheritance?
class derived_classname : base_classname{ /*define class body*/ }; class base_classname : derived_classname{ /*define class body*/ }; class derived_classname : access base_classname{ /*define class body*/ }; class base_classname :access derived_classname{ /*define class body*/ };
27. An abstract class can have
only abstract methods only concrete methods neither abstract nor concrete both abstract and concrete methods.
28. If there is an abstract method in a class then, ________________
Class must be abstract class Class may or may not be abstract class Class is generic Class must be public
29. Which of the following is the correct way of implementing an interface salary by class manager?
class manager extends salary {} class manager implements salary {} class manager imports salary {} none of the mentioned
30. Which of these access specifiers can be used for an interface?
Public Protected Private All of the mentioned
31. Which of these is a mechanism for naming and visibility control of a class and its content?
Object Packages Interfaces None of the Mentioned
32. Which of the following is the correct way of importing an entire package ‘pkg’
import pkg. Import pkg. import pkg.* Import pkg.*
33. public class MethodDemo { public String message = "Hi"; public void displayName(){ System.out.println(" MethodDemo "); } public static void main(String[] args) { displayName(); System.out.println(message); } }
Compilation Error : Non static variables cannot be referenced inside static methods MethodDemo Hi Syntax Error Hi MethodDemo
34. class MethodDemo { int counter = 10; public static void main (String Args[]){ counter =22; System.out.println("counter value" +counter); } }
Compilation Error counter value" +22 counter value" +10 Syntax Error
35. public class MethodDemo{ public String message = "Hi"; public void displayName(){ System.out.println(" MethodDemo "); } public static void main(String[] args) { MethodDemo demo = new MethodDemo (); demo.displayName(); } }
Compilation Error MethodDemo Syntax Error None of the above
36. Create a list containing string,integer and an Employee object import java.util.List; import java.util.ArrayList; class Employee{} public class ArrayListDemo { public static void main(String[] args) { //Your code // // // for(int index=0 ; index<list.size() ; index++) System.out.println(" "+ index + " : " + list.get(index) ); } }
List list = new ArrayList(); list.add("Hi"); list.add(new Integer(100)); list.add(new Employee()); List list() = new ArrayList;list.add("Hi");list.add(new Integer(100));list.add(new Employee()); List list = new ArrayList; list.add("Hi"); list.add(new Integer(100)); list.add(new Employee()); None of the above
37. public class Test { public static void main(String[] args) { try { System.out.printf(&quot;1&quot;); int data = 5 / 0; } catch(ArithmeticException e) { System.out.printf(&quot;2&quot;); System.exit(0); } finally { System.out.printf(&quot;3&quot;); } System.out.printf(&quot;4&quot;); } }
12 1234 124 123
38. public class Test{ public static void main(String args[]){ int i; try{ i=find(); System.out.println(i); }catch(Exception e){ System.out.println(“Error Occurred”); } }static int find(){ return(9/2); }}
4 4.5 Error Occured Compilation Error
39. class MyClass{ public String test(){ try{ System.out.println(“one”); return “ “; }finally{ System.out.println(“two”); }}} public class Test{ public static void main(String args[]){ Myclass m=new Myclass(); m.test(); }}
one two one two compilation error
40. Which among the following is true?
If catch block of base class is written first, it is compile time error If catch block of base class is written first, it is run time error If catch block of base class is written first, derived class catch block can’t be reached If catch block of base class is written first, derived class catch block can’t be reached
41. What is the output of the following program? class output { public static void main(String args[]) { String a = &quot;hello i love java&quot;; System.out.println(a.indexOf(&#39;e&#39;)+&quot; &quot;+a.indexOf(&#39;a&#39;)+&quot; &quot;+a.lastIndexOf(&#39;l&#39;)+&quot; &quot;+a.lastIndexOf(&#39;v&#39;)); } }
6 4 6 9 5 4 5 9 7 8 8 9 1 14 8 15
42. What will be the output of the following program? public class Shock { public static void main(String[] args) { Long abc = 200L; Long bca = 199L; Long cab = 100L; if ((abc &gt; bca) ^ ((cab * 3) == abc)) System.out.print(&quot;ABC&quot;); else if ((bca + 1 != abc) ^ ((cab * 3) == bca)) System.out.print(&quot;BCA&quot;); System.out.print(&quot;CAB&quot;); }
ABCBCACAB CAB Some other output Compilation or run time error
43. Which of these is a super class of Character wrapper?
Long Digits Float Number
44. What is the output of the following program? class Main { public static void main(String args[]) { Double x = new Double(10); double i = x.doubleValue(); System.out.print(i + &quot; &quot; + x); } }
Compile-time error 10 10 10.0 10.0 10 10.0
45. public class WrapperExample1{ public static void main(String args[]){ int a=20; Integer i=Integer.valueOf(a); Integer j=a; System.out.println(a+&quot; &quot;+i+&quot; &quot;+j); }}
20 0 0 20 20 0 20 20 20 Compilation error
46. What will be the output of the following Java program?import java.util.*; class Array { public static void main(String args[]) { int array[] = new int [5]; for (int i = 5; i &gt; 0; i--) array[5-i] = i; Arrays.fill(array, 1, 4, 8); for (int i = 0; i &lt; 5 ; i++) System.out.print(array[i]); } }
12885 12845 58881 54881
47. Which of this interface is not a part of Java’s collection framework?
List Set SortedMap SortedList
48. What is the difference between length() and size() of ArrayList?
length() and size() return the same value length() is not defined in ArrayList size() is not defined in ArrayList length() returns the capacity of ArrayList and size() returns the actual number of elements stored in the list
49. Which interface does java.util.Hashtable implement?
Java.util.Map Java.util.List Java.util.Hashtable Java.util.Collection
50. What is the length of the application box made in the following Java program? import java.awt.*; import java.applet.*; public class myapplet extends Applet { Graphic g; g.drawString(&quot;A Simple Applet&quot;,20,20); }
20 Default value Compilation Error Runtime Error
51. public class Test { public static void main(String[] args) { int count = 1; while (count <= 15) { System.out.println(count % 2 == 1 ? "*" : "+++++"); ++count; } // end while } // end main }
15 times * 15 times +++++ 8 times * and 7 times +++++ Both will print only once
52. What is the output of the following program? import java.util.*; public class priorityQueue { public static void main(String[] args) { PriorityQueue<Integer> queue = new PriorityQueue<>(); queue.add(11); queue.add(10); queue.add(22); queue.add(5); queue.add(12); queue.add(2); while (queue.isEmpty() == false) System.out.printf("%d ", queue.remove()); System.out.println("\n"); } }
11 10 22 5 12 2 2 12 5 22 10 11 2 5 10 11 12 22 22 12 11 10 5 2
53. What is the output of the following program? class output { public static void main(String args[]) { String a = &quot;hello i love java&quot;; System.out.println(a.indexOf(&#39;e&#39;)+&quot; &quot;+a.indexOf(&#39;a&#39;)+&quot; &quot;+a.lastIndexOf(&#39;l&#39;)+&quot; &quot;+a.lastIndexOf(&#39;v&#39;)); } }
6 4 6 9 5 4 5 9 7 8 8 9 1 14 8 15