Explore topic-wise MCQs in Java Programming.

This section includes 26 Mcqs, each offering curated multiple-choice questions to sharpen your Java Programming knowledge and support exam preparation. Choose a topic below to get started.

1.

What is the output of this program?
class N 
 {
 int p;
 double q;
 }
 class M extends N
 {
	int r;
 }
 public class result 
 {
 public static void main(String args[]) 
 {
 N p = new N();
 M q = new M();
 Class object;
 object = q.getClass();
 System.out.print(object.isInstance(p));
 }
 }
A. true true
B. false false
C. true
D. false
E. None of these
Answer» E. None of these
Discussion
2.

What is the output of this program?
class N 
 {
 int p;
 double q;
 }
 class M extends N
 {
	int r;
 }
 public class Result 
 {
 public static void main(String args[]) 
 {
 N p = new N();
 M q = new M();
 Class object;
 object = q.getClass();
 System.out.print(q.equals(p));
 }
 }
A. false
B. true
C. true false
D. false true
E. None of these
Answer» B. true
Discussion
3.

What is the output of this program?
class N
 {
 int p;
 double q;
 }
 class M extends N
 {
	int r;
 }
 public class Result 
 {
 public static void main(String args[]) 
 {
 N p = new N();
 M q = new M();
 Class object;
 object = q.getClass();
 System.out.print(object.getSuperclass());
 }
 }
A. class M
B. M
C. class N
D. N
E. None of these
Answer» D. N
Discussion
4.

What is the output of this program?
public class isNaN_Example 
 {
 public static void main(String args[]) 
 {
 Double num = new Double(1 / 0.); 
 boolean p = num.isNaN();
 System.out.print(p);
 }
 }
A. true
B. false
C. 0
D. 1
E. None of these
Answer» C. 0
Discussion
5.

What is the output of this program?
public class isinfinite_Example
 {
 public static void main(String args[]) 
 {
 Double num = new Double(1 / 0.); 
 boolean p = num.isInfinite();
 System.out.print(p);
 }
 }
A. true true
B. false false
C. false
D. true
E. None of these
Answer» E. None of these
Discussion
6.

What is the output of this program?

class box_Shape 
 {
 int width;
 int height;
 int length;
 } 
 public class mainclass 
 {
 public static void main(String args[]) 
 { 
 box_Shape obj = new box_Shape();
 System.out.println(obj);
 } 
 }
A. Compiletime error
B. Runtime error
C. Garbage value
D. box_Shape@2a139a55
E. None of these
Answer» E. None of these
Discussion
7.

What is the output of this program?

class box_Shape 
 {
 int width;
 int height;
 int length;
 } 
 public class mainclass 
 {
 public static void main(String args[]) 
 { 
 box_Shape obj1 = new box_Shape();
 box_Shape obj2 = new box_Shape();
 obj1.height = 3;
 obj1.length = 4;
 obj1.width = 6;
 obj2 = obj1;
 System.out.println(obj2.height);
 } 
 }
A. 3
B. 2
C. 1
D. Runtime error
E. Garbage value
Answer» B. 2
Discussion
8.

What is the output of this program?
class N
 {
 int p;
 double q;
 }
 class M extends N 
 {
	int r;
 }
 public class Result 
 {
 public static void main(String args[]) 
 {
 N p = new N();
 M q = new M();
 Class object;
 object = q.getClass();
 System.out.print(object.isLocalClass());
 }
 }
A. True
B. False
C. 0
D. 1
E. None of these
Answer» E. None of these
Discussion
9.

What is the output of this program?
class N 
 {
 int p;
 double q;
 }
 class M extends N
 {
	int r;
 }
 public class Output 
 {
 public static void main(String args[]) 
 {
 N p = new N();
 M q = new M();
 Class object;
 object = p.getClass();
 System.out.print(object.getName());
 }
 }
A. p
B. q
C. N
D. M
E. r
Answer» D. M
Discussion
10.

What is the output of this program?
class N
 {
 int p;
 double q;
 }
 class M extends N 
 {
	int r;
 }
 public class Result 
 {
 public static void main(String args[]) 
 {
 N p = new N();
 M q = new M();
 Class object;
 object = q.getClass();
 System.out.print(object.getSuperclass());
 }
 }
A. N
B. M
C. Class N
D. Class M
E. None of these
Answer» D. Class M
Discussion
11.

What is the value of n after this line of code has been executed?
double n = Math.round ( 4.5 + Math.random() );
A. 1
B. 2
C. 3
D. 4
E. 5
Answer» F.
Discussion
12.

What is the output of this program?
public class binary_Example
 {
 public static void main(String args[]) 
 {
 int n = 16;
 System.out.print(Integer.toBinaryString(n));
 }
 }
A. 10000
B. 00001
C. 00100
D. 01000
E. 1000
Answer» B. 00001
Discussion
13.

What is the output of this program?

class N 
 {
 int K;
	int L;
 N() 
 {
 K = 1;
 L = 2;
 }
 }
 public class Result 
 {
 public static void main(String args[])
 {
 N obj = new N();
 System.out.print(obj.toString());
 }
 }
A. false
B. Compilation Error
C. true
D. String associated with obj
E. None of these
Answer» E. None of these
Discussion
14.

What is the stored in the object obj in following lines of code?

box obj;
A. Any arbitrary pointer
B. Memory address of allocated memory of object
C. Garbage
D. NULL
E. None of these
Answer» E. None of these
Discussion
15.

What is the output of this program?

public class Result 
 {
 public static void main(String args[])
 {
 Object object = new Object();
 System.out.print(object.getclass());
 }
 }
A. Compilation error
B. class object
C. class java.lang.Object
D. Runtime error
E. None of these
Answer» B. class object
Discussion
16.

What is the output of this program?
public class Result 
 {
 public static void main(String args[]) 
 {
 Integer n = new Integer(260); 
 byte p = n.byteValue();
 System.out.print(p);
 }
 }
A. 0
B. 1
C. 2
D. 3
E. 4
Answer» F.
Discussion
17.

What is the output of this program?
public class Result 
 {
 public static void main(String args[]) 
 {
 char array[] = {'P', '8', 'Q', ' '}; 
 System.out.print(Character.isDigit(array[1]) + " ");
 System.out.print(Character.isWhitespace(array[2]) + " ");
 System.out.print(Character.isUpperCase(array[0]));
 }
 }
A. true false true
B. false true true
C. true true true
D. false false false
E. false true false
Answer» B. false true true
Discussion
18.

What is the output of this program?

public class Result
 {
 public static void main(String args[])
 {
 Object o = new Object();
 System.out.print(o.getClass());
 }
 }
A. class java.lang.Object
B. Object
C. Compilation Error
D. class Object
E. None of these
Answer» B. Object
Discussion
19.

What is the output of this program?

class N
 {
 int K;
 int L;
 N() 
 {
 K = 1;
 L = 2;
 }
 }
 public class Result 
 {
 public static void main(String args[])
 {
 N object = new N();
 System.out.print(object.toString());
 }
 }
A. Compilation Error
B. true
C. false
D. String associated with object
E. None of these
Answer» E. None of these
Discussion
20.

What is the output of this program?

class box_Shape
 {
 int width;
 int height;
 int length;
 } 
 public class mainclass 
 {
 public static void main(String args[]) 
 { 
 box_Shape obj = new box_Shape();
 obj.width = 12;
 obj.height = 4;
 obj.length = 15;
 int p = obj.width * obj.height * obj.length; 
 System.out.print(p);
 } 
 }
A. 420
B. 520
C. 620
D. 720
E. 820
Answer» E. 820
Discussion
21.

What is the output of this program?

public class main_class_Example
 {
 public static void main(String args[])
 {
 int p = 10;
 if (p == 10) 
 { 
 // int p = 20;
 int q = 20;
 System.out.println(q);
 }
 } 
 }
A. 10
B. 20
C. 11
D. 21
E. 25
Answer» C. 11
Discussion
22.

Which of these class have only one field TYPE ?

A. System
B. Runtime
C. Process
D. Void
E. None of these
Answer» E. None of these
Discussion
23.

What is the value of n after this line of code has been executed?

A. 1
B. 2
C. 3
D. 4
E. 5
Answer» F.
Discussion
24.

What is the value of double consonant E defined in Math class?

A. approximately 0
B. approximately 2.72
C. approximately 3.14
D. approximately 3
E. None of these
Answer» C. approximately 3.14
Discussion
25.

Standard output variable out is defined in which class?

A. Process
B. System
C. Void
D. Runtime
E. None of these
Answer» C. Void
Discussion
26.

What is the stored in the object obj in following lines of code?

A. Any arbitrary pointer
B. Memory address of allocated memory of object
C. Garbage
D. NULL
E. None of these
Answer» E. None of these
Discussion