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Java Multiple Choice Questions For Beginners - 24

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Question: 75

Find the output of below program

import java.util.*;

public class Main
{
public static void main(String[] args) {
    List<Integer> list = new ArrayList();
    list.add(10);
    System.out.print(list.size());
    List<Integer> list2 = new ArrayList(list);
    System.out.print(list2.size());

    }
}

(A) 22
(B) 12
(C) 11
(D) 21

Level: Beginner Category of MCQ: collection

Question: 76

Packages can contain hidden classes that are used by the package itself but are not visible or accessible outside the package.

(A) True
(B) False

Level: Beginner Category of MCQ: packages

Question: 77

Different packages can have classes with the same name

(A) True
(B) False

Level: Beginner Category of MCQ: packages

Question: 78

Packages resolves ambiguity for classes which have the same name

(A) True
(B) False

Level: Beginner Category of MCQ: packages

Question: 79

Does Java allows default values to arguments?

public void sum(int a = 10, int b = 20) ?

(A) Yes
(B) No

Level: Beginner Category of MCQ: overriding

Question: 80

Which of the following exception is Checked exception?

(A) NullPointerException
(B) NumberFormatException
(C) ClassCastException
(D) ParseException

Level: Beginner Category of MCQ: exceptions

Question: 81

List of top 10 Exceptions used in Java

1. NullPointerException // Unchecked
2. NumberFormatException // Unchecked
3. IllegalArgumentException // Unchecked
4. RuntimeException // Unchecked
5. IllegalStateException // Unchecked
6. NoSuchMethoException // Checked
7. ClassCastException // Unchecked
8. Exception // Checked
9. ParseException // Checked
10. InvocationTargetException // Checked

Level: Beginner Category of MCQ: exceptions

Question: 82

What is abstract in Java?

(A) abstract is a keyword
(B) abstract is a method
(C) abstract is a class
(D) All of these

Level: Beginner Category of MCQ: interfaces

Question: 83

Where is Reference variables allocated?

(A) Heap
(B) Stack
(C) Cache
(D) Register

Level: Beginner Category of MCQ: referencevar

Question: 84

Which of these clause will be executed even if no exceptions are found?

(A) throws
(B) finally
(C) catch
(D) throw

Level: Beginner Category of MCQ: exceptions

Question: 85

 A single try block must be followed by which of these?

(A) finally
(B) catch
(C) finally & catch
(D) none of the mentioned

Level: Beginner Category of MCQ: exceptions

Question: 86

 Which of these packages contain all the Java’s built in exceptions?

(A) java.io
(B) java.util
(C) java.lang
(D) java.net

Level: Beginner Category of MCQ: exceptions

Question: 87

class Main {   
   public static void main(String args[]) {      
         int t;      
         System.out.println(t); 
    }   
}

(A) 0
(B) garbage value
(C) runtime error
(D) compile time error

Level: Beginner Category of MCQ: other

Question: 88

Which of the following statements is/are TRUE regarding JAVA ? (a) Constants that cannot be changed are declared using the ‘static’ keyword. (b) A class can only inherit one class but can implement multiple interfaces.

(A) a
(B) b
(C) a and both
(D) Neither a nor b

Level: Beginner Category of MCQ: other

Question: 89

Find the output of below Java program:

public class Main
{
    public static int a;
    
    public Main(){
        a=10;
    }
    
    public static void printMe(){
        System.out.println(a);
    }
    
   public static void main(String[] args) {
       printMe();
  }

}

(A) 10
(B) 0
(C) Error in Code
(D) Nothing is printed

Level: Beginner Category of MCQ: datatype

Question: 90

import java.util.*;

public class Main {
 public static void main(String[] args) {
 List p = new ArrayList();
 p.add(7);
 p.add(1);
 p.add(5);
 p.add(1);
 p.remove(1);
 System.out.println(p);
 }
}

(A) [7,1,5]
(B) [7,5,1]
(C) [7, 1, 5, 1]
(D) None of the above

Level: Beginner Category of MCQ: datatype

Question: 91

import java.util.*;
public class Main {
 public static void main(String[] args) {
 List<String> items = new ArrayList<>();
 items.add("Pen");
 items.add("Pencil");
 items.add("Box");
 for (String i : items) {
 if (i.indexOf("P") == 0) {
 continue;
 } else {
 System.out.print(i+" ");
 }
 }
 }
}

(A) Pen Pencil Box
(B) Pen Pencil
(C) Box
(D) Compilation Error

Level: Beginner Category of MCQ: datatype

Question: 92

Thread class defines several methods that help manage threads. Which of the following method suspends a thread for a period fo time?

(A) join
(B) sleep
(C) getPriority
(D) isAlive

Level: Beginner Category of MCQ: multithreading

Question: 93

Note:- Unlike many other computer languages, Java provides built-in support for multithreading. Multithreading in Java contains two or more parts that can run concurrently. A Java thread is actually a lightweight process.

Level: Beginner Category of MCQ: multithreading

Question: 94

Note:- A Java thread exists in several states - New, Running, Suspended, Blocked & Terminated.

Level: Beginner Category of MCQ: multithreading

Question: 95

Note: final static variables can't be modified once initialized and can be accessed outside of the class without creating object. Here is an example :-

public class JavaExample{
   public final static int DELAY = 5;
}

public class Main
{
public static void main(String[] args) {
    System.out.println(JavaExample.DELAY);
}
}

Level: Beginner Category of MCQ: variables

Question: 96

Note: You can create your own exceptions by extending RuntimeException class. Here is an example:-

public class MyException extends RuntimeException{
	
	public MyException(String message){
		super(message);
	}

}

//Example to use this exception 
throw new MyException("Any error message");

Level: Beginner Category of MCQ: exceptions

Question: 97

Note: Apache PDFBox is an open source pure-Java library that can be used to create, render, print, split, merge, alter, verify and extract text and meta-data of PDF files.

Level: Beginner Category of MCQ: other

Question: 98

What is the output of the program?
public class Main{
public static void main(String[] args){
int j;
System.out.println(j);
}
}

(A) 0
(B) Garbage Value
(C) Compiler Error
(D) Runtime Error

Level: Beginner Category of MCQ: datatype

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Java Multiple Choice Questions For Beginners - 24

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