Question 1

Which of the following is the correct format of a Java program?

  class abc {
   Public static void main(String args[]) {……………}
  }

  class abc {
   public Static void main(String args[]) {……………}
  }

  class abc {
   Public static void Main(String args[]) {……………}
  }

  class abc {
   public static void main(String args[]) {……………}
  }

Answer

Correct Option: D

Question 2

Which of the following statements regarding 'finally' block in Java is false?

Before the termination of the program, JVM executes the 'finally' block (if any).
The 'finally' block can be used for writing the cleanup code.
The 'finally' block must be followed by try or catch block.
There can be multiple 'finally' blocks for a try block.
The 'finally' block is not executed if the program exists.

Answer

Correct Option: D

Question 3

Which of the following methods defined in Math class is used to return the smallest whole number greater than or equal to the argument specified in it?

abs()
round()
ceil()
floor()
max()

Answer

Correct Option: C

Question 4

Which of the following statements is false regarding inheritence?

A class can extend another class.
A class can implement multiple interfaces.
A class can extend multiple classes.
An interface can extend another interface.
A class can extend another class and implement an interface at the same time.

Answer

Correct Option: C

Question 5

Which of the following is the Super class of all the classes in Java?

Class
Throwable
Object
String
Super

Answer

Correct Option: C

Question 6

How many parameterized constructors are defined for a Scanner class?

5
6
7
8

Answer

Correct Option: D

Question 7

Which of the following methods of Observable class returns the true value if the invoking object is modified and false if it is not?

countObservers()
deleteObserver()
hasChanged()
setChanged()
addObserver()

Answer

Correct Option: C

Question 8

Which of the following statements is not correct about a constructor?

A constructor can be executed simultaneously with the creation of an object.
A constructor which is used for one object cannot be used again unless a second object is created.
A constructor does not return a value.
A constructor cannot be overloaded.
A constructor must have the same name as its class.

Answer

Correct Option: D

Question 9

What will be the output of java MyClass,java? class Base {
public static void main(String[] args) {
System.out.println(In Base Class );
}
}
public class MyClass extends Base { }

compile time error
run time error
execute successfully with no output
prints In Base Class
none of these

Answer

Correct Option: D

Question 10

Find the output of the following program code. class parent {
final int a=10;
void meth() {
System.out.println(parent); } } class Test1 extends parent { int a=20;
public static void main(String[] args)
{ parent par = new parent(); parent par2 = new Test1(); par.meth(); par2.meth(); System.out.println(par.a); System.out.println(par2.a); } void meth() { System.out.println(child);
}
}

parentchild1010
parentchild 2020
child child2020
parentparent 2020
childchild1010

Answer

Correct Option: A

Question 11

Consider the following program code. class person { private string name; private int age; void person() { name=Raju; } talk() { System.out.println(Hello I am + name); } } Which constructor has been wrongly defined?

class person()
talk()
person()
private int age;
none of these

Answer

Correct Option: C

Question 12

The constructor StringBuffer() of a StringBuffer class creates a string buffer with the capacity of ________ characters by default.

8
16
32
64

Answer

Correct Option: B

Question 13

What is the correct way to access the static methods declared within the class?

Static methods can be accessed using the class name.
Static methods can be accessed directly by writing the method name.
Static methods can be accessed using objects of the class, where the static method is defined.
Static methods can be accessed using “this”.

Answer

Correct Option: A

Question 14

Which of the following are constructors for the wrapper Byte class?

Byte(Byte b1);

Byte(String str1);
Byte(int b1);

Byte(String str1);
Byte(byte b1);

Byte(String str1);
Byte(byte b1);

Byte(string str1);

Answer

Correct Option: C

Question 15

The class String is defined in the package ___________.

java.awt
java.lang
java.math
java.net

Answer

Correct Option: B

Description: Constructors, Classes, and Inheritance
Number of Questions: 15
Created by: Aliensbrain Bot
Tags: Constructors Classes and Inheritance Java/Oracle /C/C++ Java Basics of Java


Byte(Byte b1);
Byte(String str1);


Byte(int b1);
Byte(String str1);


Byte(byte b1);
Byte(String str1);


Byte(byte b1);
Byte(string str1);

Constructors, Classes, and Inheritance

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