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Java Objective Questions (MCQs) - 225

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Question: 141

Find the output of below program

public class Main
{
	public static void main(String[] args) {
		int a = Integer.parseInt("cppbuzz");
		System.out.print(a);
	}
}

(A) 99
(B) 67
(C) Unpredictable Value
(D) NumberFormatException

Level: Practitioner Category of MCQ: typecasting

Question: 142

In case of 'try' & 'catch' block, is it possible to use only 'try' block instead of using 'catch'?

(A) Yes
(B) No

Level: Beginner Category of MCQ: exceptions

Question: 143

Find the output of below program

public class Main
{
public static void main(String[] args) {
    try{
	int a = -100;
	System.out.print(a);
    }
}
}

(A) -100
(B) Compilation Error
(C) Exception since catch is missing
(D) Exception since finally is missing

Level: Beginner Category of MCQ: exceptions

Question: 144

Can we use 'catch()' without passing arguments in it?

(A) Yes
(B) No It is compilation error

Level: Beginner Category of MCQ: exceptions

Question: 145

public class Main
{
public static void main(String[] args) {
    
try{
    int a = -100;
    System.out.print(a);
    throw null;
}
catch(Exception obj){
    System.out.print(obj.getMessage());
}
}
}

(A) -100
(B) null
(C) -100null
(D) null-100

Level: Practitioner Category of MCQ: exceptions

Question: 146

public class Main
{
public static void main(String[] args) {
    
try{
    int a = -100;
    throw null;
    System.out.print(a);
}
catch(Exception obj){
    System.out.print(obj.getMessage());
}
}
}

(A) -100null
(B) -100
(C) null
(D) Compilation Error - unreachable statement at line 8

Level: Practitioner Category of MCQ: exceptions

Question: 147

public class Main
{
System.out.print("Hello");
    
public static void main(String[] args) {
         
     }
}

(A) Hello
(B) Compilation Error
(C) Exception
(D) None of these

Level: Practitioner Category of MCQ: classesAndobjects

Question: 148

public class Main
{

public static void main(String[] args) {
     
    System.out.print(2>4?"Hi":"Hello");
    
     }

(A) Compilation Error
(B) Exception
(C) Hi
(D) Hello

Level: Practitioner Category of MCQ: methods

Question: 149

Find the output of below program 

public class Main
{
public static void main(String[] args) {
int [] array = {1,2,3,4,5};
		
for(int i = -1; i<5;i++)
System.out.print(array[i]);
		
}
}

(A) 12345
(B) 1234
(C) Compilation Error
(D) ArrayIndexOutOfBoundsException

Level: Expert Category of MCQ: arrays

Question: 150

public class Main
{
    public static void function(int temp){
        temp*=2;
    }
    public static void main(String[] args) {
        int a = 10;
	function(a);
	System.out.print(a);
    }
	
}

(A) 20
(B) 10
(C) Compilation Error
(D) None of the above

Level: Practitioner Category of MCQ: methods

Question: 151

public class Main
{
public static void function(int [] arr){
    
for(int i = 0; i<5;i++)
arr[i] = arr[i] *2;
}

public static void main(String[] args) {
int [] array = {1,2,3,4,5};
	
function(array);
	
for(int i = 0; i<5;i++)
System.out.print(array[i]);
	
}
}

(A) Compilation Error
(B) 12345
(C) 246810
(D) Exception

Level: Practitioner Category of MCQ: arrays

Question: 152

In Java how arrays are passed in methods?

(A) Arrays are passed by Value
(B) Arrays are passed by Reference
(C) It depends on type of array
(D) It depends on Compiler

Level: Beginner Category of MCQ: arrays

Question: 153

Can Abstract classes instantiated?

(A) Yes
(B) No

Level: Beginner Category of MCQ: abstractclass

Question: 154

What is 'abstract' in Java?

(A) It is an Keyword
(B) Its is a Data type
(C) It is a Class
(D) None of the above

Level: Beginner Category of MCQ: abstractclass

Question: 155

Can we override final methods of abstract classes?

(A) Yes
(B) No

Level: Expert Category of MCQ: abstractclass

Question: 156

Abstract methods of abstract classes are mandatory to be overridden by sub classes. Is that true?

(A) Yes
(B) No

Level: Practitioner Category of MCQ: abstractclass

Question: 157

What is the output of below code?

public class Testing {

public static void main (String []args) {

String readAllFile = new Scanner(new File("cppbuzz.txt")).useDelimiter("A").next();

System.out.println(readAllFile);

}
}

(A) It reads first line of cppbuzz.txt file
(B) It reads first character of cppbuzz.txt file
(C) It reads all the contents of cppbuzz.txt file
(D) None of these

Level: Practitioner Category of MCQ: filehandling

Question: 158

Find the output of below program

import java.util.*; 

public class Main
{
public static void main(String[] args) {
List<Integer> mylist = new ArrayList();
System.out.println(mylist.size());
}
}

(A) Compilation Error
(B) Exception
(C) 1
(D) 0

Level: Beginner Category of MCQ: collection

Question: 159

import java.util.*; 

public class Main
{
public static void main(String[] args) {
List<Integer> mylist = new ArrayList();
mylist.remove(0);
System.out.println(mylist.size());
}
}

(A) Nothing is printed
(B) IndexOutOfBoundsException
(C) Compilation Error
(D) 0

Level: Practitioner Category of MCQ: collection

Question: 160

Find the output of below program

import java.util.*; 

public class Main
{
	public static void main(String[] args) {
	    List<Integer> mylist = new ArrayList();
	    mylist.add(5);
	    System.out.println(mylist.remove(0));
	}
}

(A) Nothing is printed
(B) Compilation Error
(C) Exception
(D) 5

Level: Practitioner Category of MCQ: collection

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Java Objective Questions (MCQs) - 225

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