Java MCQ: Ultimate Trivia Quiz!
29 Questions
| Total Attempts: 333
(217).jpg "Java MCQ: Ultimate Trivia Quiz!")
Questions and Answers
- 1.What is the extension of byte code files?
- A.
.java
- B.
.class
- C.
.xml
- D.
.byte
- 2.What is it called where a child object gets killed if the parent object is killed?
- A.
Aggregation
- B.
Composition
- C.
Encapsulation
- D.
Association
- 3.What is true about constructors?
- A.
It can contain return type
- B.
It can take any number of parameters
- C.
It can have any non access modifiers
- D.
Constructor cannot throw an exception
- 4.What would be the behavior if the constructor has a return type?
- A.
Compilation error
- B.
Runtime error
- C.
Compilation and runs successfully
- D.
Only String return type is allowed
- 5.Which component is used to compile, debug, and execute the java program?
- A.
JVM
- B.
JDK
- C.
JIT
- D.
JRE
- 6.Which component is responsible for converting bytecode into machine-specific code?
- A.
JVM
- B.
JDK
- C.
JIT
- D.
JRE
- 7.What is the extension of java code files?
- A.
.class
- B.
.java
- C.
.txt
- D.
.js
- 8.Which of these operators is used to allocate memory for an object?
- A.
Malloc
- B.
Alloc
- C.
New
- D.
give
- 9.What will be the output of the following Java program? class box { int width; int height; int length; } class mainclass { public static void main(String args[]) { box obj1 = new box(); box obj2 = new box(); obj1.height = 1; obj1.length = 2; obj1.width = 1; obj2 = obj1; System.out.println(obj2.height); } }
- A.
1
- B.
2
- C.
Runtime error
- D.
Garbage value
- 10.What will be the output of the following Java program? class box { int width; int height; int length; } class mainclass { public static void main(String args[]) { box obj = new box(); System.out.println(obj); } }
- A.
0
- B.
1
- C.
Runtime error
- D.
[email protected] in hexadecimal form
- 11.Which of these keywords can be used to prevent Method overriding?
- A.
Static
- B.
constant
- C.
Protected
- D.
Final
- 12.What will be the output of the following Java program? class A { int i; public void display() { System.out.println(i); } } class B extends A { int j; public void display() { System.out.println(j); } } class Dynamic_dispatch { public static void main(String args[]) { B obj2 = new B(); obj2.i = 1; obj2.j = 2; A r; r = obj2; r.display(); } }
- A.
1
- B.
2
- C.
3
- D.
4
- 13.What is the return type of a method that does not return any value?
- A.
Int
- B.
Float
- C.
void
- D.
Double
- 14.What will be the output of the following Java program? class box { int width; int height; int length; int volume; void volume(int height, int length, int width) { volume = width*height*length; } } class Prameterized_method { public static void main(String args[]) { box obj = new box(); obj.height = 1; obj.length = 5; obj.width = 5; obj.volume(3,2,1); System.out.println(obj.volume); } }
- A.
0
- B.
1
- C.
6
- D.
25
- 15.What will be the output of the following Java program? class Output { static void main(String args[]) { int x , y = 1; x = 10; if(x != 10 && x / 0 == 0) System.out.println(y); else System.out.println(++y); } }
- A.
1
- B.
2
- C.
Runtime Error
- D.
Compilation Error
- 16.Predict the output of following Java program? class Test { int i; } class Main { public static void main(String args[]) { Test t; System.out.println(t.i); }
- A.
0
- B.
Garbage value
- C.
Compiler error
- D.
runtime error
- 17.Which of these keywords must be used to inherit a class?
- A.
Super
- B.
This
- C.
Extent
- D.
Extends
- 18.What will be the output of the following Java program? class A { int i; void display() { System.out.println(i); } } class B extends A { int j; void display() { System.out.println(j); } } class inheritance_demo { public static void main(String args[]) { B obj = new B(); obj.i=1; obj.j=2; obj.display(); } }
- A.
0
- B.
1
- C.
2
- D.
Compilation Error
- 19.All classes in Java are inherited from which class?
- A.
Java.lang.class
- B.
java.class.inherited
- C.
Java.class.object
- D.
Java.lang.Object
- 20.In order to restrict a variable of a class from inheriting to subclass, how variable should be declared?
- A.
Protected
- B.
Private
- C.
Public
- D.
Static
- 21.What will be the output of the following Java code? class test { int a; int b; void meth(int i , int j) { i *= 2; j /= 2; } } class Output { public static void main(String args[]) { test obj = new test(); int a = 10; int b = 20; obj.meth(a , b); System.out.println(a + " " + b); } }
- A.
10 20
- B.
20 10
- C.
20 40
- D.
40 20
- 22.What will be the output of the following Java code? class overload { int x; int y; void add(int a) { x = a + 1; } void add(int a , int b) { x = a + 2; } } class Overload_methods { public static void main(String args[]) { overload obj = new overload(); int a = 0; obj.add(6, 7); System.out.println(obj.x); } }
- A.
6
- B.
7
- C.
8
- D.
9
- 23.What is the extension of compiled java classes?
- A.
.class
- B.
.java
- C.
.txt
- D.
.js
- 24.Which of these can be overloaded?
- A.
Methods
- B.
Constructors
- C.
All of the mentioned
- D.
None of the mentioned
- 25.What is the data type of any class you write?
- A.
Primitive
- B.
Non primitive
- C.
String
- D.
None
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