Java Multiple Choice Questions for Experienced

Question: 1

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

(A) 11
(B) 12
(C) 13
(D) Compilation Error

Level: Practitioner Category of MCQ: operators

Question: 2

Which of these are Access Modifiers in java?

(A) default
(B) public
(C) protected
(D) All of these

Level: Practitioner Category of MCQ: other

Question: 3

How many times 'Hello' is printed?

public class CppBuzz {
public static void main(String[] args){
 for(int i = 0; i<5; i++)
 {
 System.out.println("Hello");
 i++;
 i--;
 }
}
}

(A) 5
(B) 4
(C) 3
(D) 2

Level: Practitioner Category of MCQ: loops

Question: 4

How many times 'Hello' is printed?

public class CppBuzz {
public static void main(String[] args){
 for(int i = 0; i<5; i++)
 {
 System.out.println("Hello");
 i+=2;
 }
}
}

(A) 1
(B) 2
(C) 3
(D) 4

Level: Practitioner Category of MCQ: loops

Question: 5

public class CppBuzz {
public static void main(String[] args){
 for(int i = 0; i<5; i+=2)
 {
 System.out.println("Hello");
 i+=2;
 }
}
}

(A) 0
(B) 1
(C) 2
(D) 3

Level: Practitioner Category of MCQ: loops

Question: 6

How many times 'Hello' is printed?

public class CppBuzz {
public static void main(String[] args){
 for(int i = 0; i<5; )
 {
 System.out.println("Hello");
 }
}
}

(A) 0
(B) 1
(C) 2
(D) Infinite times

Level: Practitioner Category of MCQ: loops

Question: 7

How many times 'Hello' is printed?

public class CppBuzz {
public static void main(String[] args){
 for(int i = 0; i>5; )
 {
  System.out.println("Hello");
 }
}
}

(A) 5
(B) 4
(C) 3
(D) 0

Level: Practitioner Category of MCQ: loops

Question: 8

How many times 'Hello' is printed?

public class CppBuzz {
public static void main(String[] args){
 for(int i = 0; i<5; i=5 )
 {
  System.out.println("Hello");
 }
}
}

(A) 5
(B) 4
(C) 2
(D) 1

Level: Practitioner Category of MCQ: loops

Question: 9

public class CppBuzz{
  
public static void main(String[] args){
  
  int a = 0;
  a +=5;
  
  switch(a){
   
    case 5: System.out.print("5");
    case 10: System.out.print("10");break;
    default: System.out.print("0");
    
  }
  
}
}

(A) 5
(B) 10
(C) 510
(D) Compilation Error

Level: Practitioner Category of MCQ: switch

Question: 10

public class CppBuzz{
  
public static void main(String[] args){
  
  int a = -5;
  a +=5;
  
  switch(a){
   
    case 5: System.out.print("5");break;
    case 10: System.out.print("10");
    default: System.out.print("0");
    
  }
  
}
}

(A) 5
(B) 10
(C) 100
(D) 0

Level: Practitioner Category of MCQ: switch

Question: 11

import java.util.Scanner;

public class CppBuzz{
  
public static void main(String[] args){
  
  String name;
  
  Scanner sc = new Scanner(System.in);
  System.out.println("Enter your name : ");
  name = sc.nextLine(); //assume if user enters 'cppbuzz'
  
  switch(name.length()){
   
    case 5: 
    case 6:
    case 7:
    case 8:
    case 9:
    case 10: System.out.print("Length is  5-10"); break;
    default: System.out.print("Length not in 5-10");
    
  }
  
}
}

(A) Compilation Error
(B) Length is 5-10
(C) Length not in 5-10
(D) nothing is printed

Level: Practitioner Category of MCQ: if-else

Question: 12

public class CppBuzz {

public static void main(String args[]) {
       
       int a =10;
       String b = "10";
      
       System.out.println(a+b);
      
    }
}

(A) 10"10"
(B) Compilation Error
(C) 20
(D) 1010

Level: Practitioner Category of MCQ: variables

Question: 13

public class CppBuzz {

public static void main(String args[]) {
       
       int a =10;
       String b = "10";
      
       System.out.println(a-b);
      
    }
}

(A) 10-10
(B) 0
(C) 1010
(D) Compilation Error

Level: Practitioner Category of MCQ: variables

Question: 14

public class CppBuzz {

public static void main(String args[]) {
       
       int a =10;
       String b = "10";
      
       System.out.println(b+a);
      
    }
}

(A) 10+10
(B) 1010
(C) Compilation Error
(D) Undefined

Level: Practitioner Category of MCQ: variables

Question: 15

public class Main
{
private int a;
public Main(){
        
    }
public Main(int temp){
        a = -10;
    }

public static void main(String[] args) {
    Main obj = new Main();
	System.out.println(obj.a);
}
}

(A) -10
(B) Undefined
(C) Compilation Error
(D) 0

Level: Practitioner Category of MCQ: classesAndobjects

Question: 16

public class Main
{
    public void sum(int a, int b){
        System.out.print(a+b);
    }
    
	public static void main(String[] args) {
		sum(0,0);
		sum(-1,-1);
		
	}
}

(A) -2
(B) 0-1
(C) 0-2
(D) error: non-static method can't be called

Level: Practitioner Category of MCQ: methods

Question: 17

public class Main
{
    public static int sum(int a, int b){
       return a+b;
    }
    
	public static void main(String[] args) {
		System.out.println(sum(sum(1,2),3));
		
		
	}
}

(A) Compilation Error
(B) 3
(C) 5
(D) 6

Level: Practitioner Category of MCQ: methods

Question: 18

public class Main
{   
	public static void main(String[] args) {
		float a = 10.0f;
		String temp = Integer.toString(a);
		System.out.println(temp);
	}
}

(A) 10.0f
(B) 10.0
(C) 10
(D) error: no suitable method found for toString(float)

Level: Practitioner Category of MCQ: typecasting

Question: 19

public class Main
{   
public static void main(String[] args) {
	float a = 10.0000f;
	String temp = Float.toString(a);
	System.out.println(temp);
}
}

(A) 10.0f
(B) 10.0
(C) 10.00
(D) 10.0000

Level: Practitioner Category of MCQ: typecasting

Question: 20

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

(A) 0
(B) 10
(C) 100
(D) Exception

Level: Practitioner Category of MCQ: typecasting

Question: 21

public class Main
{
public static void main(String[] args) {

	if(0==0){
	    System.out.println("Sun");
	}
	else{
	    System.out.println("Moon");
	}
}
}

(A) SunMoon
(B) Sun
(C) Moon
(D) Compilation Error

Level: Practitioner Category of MCQ: if-else

Question: 22

public class Main
{
public static void main(String[] args) {
	if(0){
	    System.out.println("Sun");
	}
	else{
	    System.out.println("Moon");
	}
}
}

(A) Moon
(B) Sun
(C) SunMoon
(D) error: int can not be converted to boolean

Level: Practitioner Category of MCQ: if-else

Question: 23

public class Main
{
public static void main(String[] args) {
    int a = 0;
	if(a==0){
	    System.out.println("Sun");
	}
	else{
	    System.out.println("Moon");
	}
}
}

(A) Sun
(B) Moon
(C) SunMoon
(D) Compilation Error

Level: Practitioner Category of MCQ: if-else

Question: 24

public class Main
{
public static void main(String[] args) {
    int a = 0;
	if(a==1){
	    System.out.println("Sun");
	}
}
}

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

Level: Practitioner Category of MCQ: if-else

Question: 25

public class Main
{
public static void main(String[] args) {
    int a = 0;
	if(a==1);{
	    System.out.println("Sun");
	}
}
}

(A) Compilation Error
(B) Sun
(C) Nothing is printed
(D) error: unreachable statement

Level: Practitioner Category of MCQ: if-else

Question: 26

public class Main
{
public static int ret(){
    return 0;
}    
public static void main(String[] args) {
    int a = 0;
	if(ret()==0)
	System.out.print("Sun");
	System.out.println("Moon");
}
}

(A) Sun
(B) SunMoon
(C) Nothing is printed
(D) Compilation Error

Level: Practitioner Category of MCQ: if-else

Question: 27

class cppbuzz{
    static void sum(){
        System.out.println("hi");
    }
}
public class Main
{
	public static void main(String[] args) {
	    cppbuzz.sum();
	}
}

(A) error: sum() is private default
(B) hi
(C) Exception
(D) Nothing is printed

Level: Practitioner Category of MCQ: classesAndobjects

Question: 28

How many times 'facebook' is printed?

public class Main
{
public static void main(String[] args) {
    
    for(int i = 0; i<5; i++);
    {
	  System.out.println("facebook");
    }
}
}

(A) 0
(B) 2
(C) 4
(D) 1

Level: Practitioner Category of MCQ: loops

Question: 29

public class HelloWorld
{
  public static void main(String[] args) {
	  
	char[] a = {'A', 'S', 'I', 'S', 'H'};
	
	int i = 4;
	
	do {
		System.out.print(a[i]);
		i--;
	}while (i>0);
	
	}
}

(A) ASISH
(B) asish
(C) HSISA
(D) HSIS

Level: Practitioner Category of MCQ: arrays

Question: 30

public class Main
{
public static void main(String[] args) {
    String input = " ";
    System.out.println("-"+input.trim()+"-");
}
}

(A) Compilation Error
(B) Exception
(C) - -
(D) --

Level: Practitioner Category of MCQ: methods

Question: 31

public class Main
{
public static void main(String[] args) {
    String input = " cpp buzz chicago ";
    input = input.trim();
    System.out.println(input.length());
}
}

(A) 3
(B) 5
(C) 18
(D) 16

Level: Practitioner Category of MCQ: methods

Question: 32

public class Main
{
public static void main(String[] args) {
    String input = "the cppbuzz";
    input = input.replace("the", " ");
    input = input.trim();
    System.out.print(input.length());
}
}

(A) 7
(B) 8
(C) 9
(D) 10

Level: Practitioner Category of MCQ: methods

Question: 33

public class Main
{
public static int i = 5;  

public static void main(String[] args) {
 decrement();
 decrement();
 decrement();
}
	
public static void decrement()
{
 System.out.print(i);
 i--;
}

}

(A) 555
(B) 544
(C) 554
(D) 543

Level: Practitioner Category of MCQ: methods

Question: 34

class Capgemini{
    protected int a;
    public Capgemini(){
        a=10; 
   }
}
public class Main extends Capgemini
{
	public static void main(String[] args) {
		Main obj = new Main();
		System.out.println(obj.a);
	}
}

(A) 0
(B) 10
(C) Compilation Error
(D) Exception

Level: Practitioner Category of MCQ: inheritance

Question: 35

What is the use of Garbage Collector in Java?

(A) Automatic Memory Management
(B) Speed-up the Execution of Java code
(C) to handle runtime exceptions
(D) All of these

Level: Practitioner Category of MCQ: other

Question: 36

What is true about 'private' members of a class?

(A) Private members can be accessed within a same package
(B) Private members can be accessed within class only
(C) Private members can be accessed within sub classes of same package
(D) All of the above

Level: Practitioner Category of MCQ: modifiers

Question: 37

Can we call Constructor without creating an object ?

(A) Yes
(B) No

Level: Practitioner Category of MCQ: classesAndobjects

Question: 38

What is the output of below program if nothing is passed as argument to main()?

public class Main
{
	public static void main(String[] args) {
		System.out.println(args[1]);
	}
}

(A) null
(B) Nothing is printed
(C) Compilation Error
(D) ArrayIndexOutOfBoundsException

Level: Practitioner Category of MCQ: methods

Question: 39

Find the output of Java program -

public class Main
{   
    public static int a(){
        
        return 65;
    }
    
    public int b(){
        
        return a();
    }
	public static void main(String[] args) {
		System.out.print("AT&T Lab");
	}
}

(A) AT&T Lab65
(B) AT&T Lab 65
(C) AT&T Lab
(D) Compilation Error

Level: Practitioner Category of MCQ: methods

Question: 40

Find the output of below Java program-

public class Main
{   
    public static int a(){
        
        return 65;
    }
    
    public static int b(){
        
        return a();
    }
	public static void main(String[] args) {
		System.out.print(""+b());
	}
}

(A) 6565
(B) 65
(C) "65"
(D) None of the above

Level: Practitioner Category of MCQ: methods

Question: 41

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

(A) 'a'
(B) a
(C) 65
(D) 97

Level: Practitioner Category of MCQ: datatype

Question: 42

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: 43

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: 44

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: 45

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: 46

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: 47

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: 48

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: 49

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: 50

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: 51

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: 52

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

Question: 53

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.add(5));
	}
}

(A) Nothing is printed
(B) 5
(C) 0
(D) true

Level: Practitioner Category of MCQ: collection

Question: 54

import java.util.*; 

public class Main
{
	public static void main(String[] args) {
	    List<Integer> mylist = new ArrayList();
	    mylist.add(-2);
	    mylist.add(-1);
	    mylist.add(0);
	    int a = mylist.get(-1);
	    System.out.println(a);
	}
}

(A) -1
(B) 0
(C) IndexOutOfBoundsException
(D) None of the above

Level: Practitioner Category of MCQ: collection

Question: 55

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(-2);
	    mylist.add(-1);
	    mylist.add(0);
	    System.out.println(mylist.get((mylist.remove(2))));
	}
}

(A) true
(B) -2
(C) Compilation Error
(D) 0

Level: Practitioner Category of MCQ: collection

Question: 56

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(-2);
	    mylist.add(-1);
	    mylist.add(0);
	    
	    System.out.print(mylist.size());
	    for(int i = 0; i<mylist.size(); i++){
	        mylist.remove(i);
	        System.out.print(mylist.size());
	    }
	    
	}
}

(A) 331
(B) 3321
(C) 310
(D) 321

Level: Practitioner Category of MCQ: collection

Question: 57

Java List has an instance variable to handle the size.
It is incremented when you add, and decremented when you remove. Calling list.size() returns a variable, and is therefore O(1)

(A) True
(B) False

Level: Practitioner Category of MCQ: collection

Question: 58

How many instances Singleton class can have in Java?

(A) 1
(B) Depends on the calling program
(C) Depends on class creating object of Singleton class
(D) 256

Level: Practitioner Category of MCQ: singleton

Question: 59

import java.util.*;

public class Main
{
    public static float sum1(float a, float b){
        System.out.print("cppbuzz");
        return a+b;
    }
    
    public static float sum(int a, int b){
        System.out.print("hello");
        return a+b;
    }
    
   public static void main(String[] args) {
        System.out.println(sum(-5, -6));
   }
}

(A) cppbuzz-11
(B) cppbuzz-11.0
(C) hello-11
(D) hello-11.0

Level: Practitioner Category of MCQ: overriding

Question: 60

Find the output of below program

class A {
  void f1 () {
    System.out.print("class-A ");
  }
}
class B extends A {
  void f1 () {
    System.out.print("Class-B ");
  }
} 
 
class Main {
  public static void main (String s[]) {
    A refA = new A();
    A refB = new B();
 
    refA.f1();
    refB.f1();
  }
}

(A) class-A class-A
(B) class-B class-B
(C) class-B class-A
(D) class-A class-B

Level: Practitioner Category of MCQ: polymorphism

Question: 61

Which of the following is a correct implementation of method overloading?

(A) void methodA(){} int methodA(){}
(B) void methodA(){} void methodA(int a){}
(C) void methodA(){} int methodB(int a){}
(D) int methodA(){} int methodAA(i{}

Level: Practitioner Category of MCQ: polymorphism

Question: 62

static import provides accessibility to static members of the class only. State true or false

(A) True
(B) False

Level: Practitioner Category of MCQ: packages

Question: 63

which class or interface defines wait(), notify() and notifyall() methods

(A) Thread
(B) Object
(C) Runnable
(D) Class

Level: Practitioner Category of MCQ: interfaces

Question: 64

Can we define main() method inside abstract class?

(A) Yes
(B) No

Level: Practitioner Category of MCQ: interfaces

Question: 65

What is output of below code?

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

(A) Compilation Error
(B) Hello CppBuzz
(C) 13
(D) Hello CppBuzz13

Level: Practitioner Category of MCQ: interfaces

Question: 66

Is it allowed to run below code when sum() is not defined and Main class is not inherited? What is the output of below code?

abstract public class Main
{
    abstract public void sum(int a, int b);
    
    public static void main(String[] args) {
	System.out.println("CppBuzz");
    }
}

(A) It is not allowed. Compilation Error
(B) It is allowed. CppBuzz
(C) It is allowed. Compilation Error
(D) None of the above

Level: Practitioner Category of MCQ: interfaces

Question: 67

What is use of join() in threads of Java?

(A) The main thread waits for other threads to finish
(B) The main thread is finished first then other threads
(C) Other threads will sleep until main is complete
(D) All of these

Level: Practitioner Category of MCQ: other

Question: 68

Find the output of below program:

public class Main
{
    public static int a;

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

(A) 10
(B) Compilation Error
(C) Undefind
(D) 0

Level: Practitioner Category of MCQ: variables

Question: 69

Find the output of below Java program:

public class Main
{
    public int a;
    
    public Main(int a){
        a = a;
        System.out.print(a);
    }
	public static void main(String[] args) {
		Main obj = new Main(5);
		System.out.print(obj.a);
	}
}

(A) 00
(B) 05
(C) 50
(D) 55

Level: Practitioner Category of MCQ: classesAndobjects

Question: 70

public class Main {
 int num = 100;
 
 public void calc(int num) {
 this.num = num * 10;
 }
 
 public void printNum(){
 System.out.println(num);
 }
 
 public static void main(String[] args) {
 Main obj = new Main ();
 obj.calc(2);
 obj.printNum();
 }
}

(A) 100
(B) 1000
(C) 2
(D) 20

Level: Practitioner Category of MCQ: classesAndobjects

Question: 71

public class Main {
 String name;
 
 Main(String n) {
 name = n;
 }
 
 public static void main(String[] args) {
 Main ref1 = new Main("laptop");
 Main ref2 = new Main("tv");
 System.out.println(ref2.equals(ref1));
 }
 
 public boolean equals(Object o) {
 Main m = (Main) o;
 if (m.name != null) {
 return true;
 }
 return false;
 }
 
}

(A) true
(B) false
(C) Compilation Error
(D) None of the above

Level: Practitioner Category of MCQ: methods

Question: 72

public class Main{
    
 public static void main(String[] args) {
     
 String[] stringArr = {"cpp ", "buzz "};
 
 for (int x = 0; x < 3; x++) {
     for (String s : stringArr) {
     System.out.print(x + " " + s);
     if (x == 1) {
     break;
     }
   }
  }
 }
}

(A) 0 cpp 0 buzz 1 cpp 1 buzz
(B) 0 cpp 0 buzz 1 cpp 2 buzz
(C) 0 cpp 0 buzz 1 cpp 1 buzz 2 cpp 2 buzz
(D) 0 cpp 0 buzz 1 cpp 2 cpp 2 buzz

Level: Practitioner Category of MCQ: arrays

Question: 73

import java.util.ArrayList;
import java.util.List;

public class Main {
 public static void main(String[] args) {
 List<Integer> elements = new ArrayList<>();
 elements.add(10);
 int firstElmnt = elements.get(1);
 System.out.println(firstElmnt);
 }
}

(A) 0
(B) 10
(C) null
(D) IndexOutOfBoundsException

Level: Practitioner Category of MCQ: arrays

Question: 74

public class Main{
 
public static void main(String[] args){

int cardVal = 12;

switch (cardVal) {
 case 4: case 5: case 6:
 case 7: case 8:
 System.out.println("India");
 break;
 case 9: case 10: case 11:
 System.out.println("USA");
 break;
 case 15: case 16:
 System.out.println("Canada");
 break;
 default:
 System.out.println("Germany");
}

}
}

(A) Germany
(B) India
(C) Canada
(D) USA

Level: Practitioner Category of MCQ: switch

Question: 75

abstract class Writer {
 public static void write() {
 System.out.println("Reading...");
 }
}
class Author extends Writer {
 public static void write() {
 System.out.println("Reading book");
 }
}
public class Programmer extends Writer {
 public static void write() {
 System.out.println("Reading code");
 }
 public static void main(String[] args) {
 Writer w = new Programmer();
 w.write();
 }
}

(A) Reading...
(B) Reading Book
(C) Reading Code
(D) Compilation Error

Level: Practitioner Category of MCQ: inheritance

Question: 76

Which access modifier makes a member available only to classes within the same package or subclasses?

(A) Private
(B) Protected
(C) Public
(D) Package-Private

Level: Practitioner Category of MCQ: inheritance

Question: 77

public class Calculator {
 int num = 100;
 public void calc(int num) {
 this.num = num * 10;
 }
 public void printNum(){
 System.out.println(num);
 }
 public static void main(String[] args) {
 Calculator obj = new Calculator ();
 obj.calc(2);
 obj.printNum();
 }
}

(A) 100
(B) 1000
(C) 2
(D) 20

Level: Practitioner Category of MCQ: classesAndobjects

Question: 78

class Feline {
 public String type = "f ";
 public Feline() {
 System.out.print("feline ");
 }
}
public class Cougar extends Feline {
 public Cougar() {
 System.out.print("cougar ");
 }
 void go() {
 type = "c ";
 System.out.print(this.type + super.type);
 }
 public static void main(String[] args) {
 new Cougar().go();
 }
}

(A) cougar c f
(B) feline cougar c c
(C) feline cougar c f
(D) Compilation fails

Level: Practitioner Category of MCQ: inheritance

Question: 79

class Alpha {
 String getType() {
 return "alpha";
 }
}
class Beta extends Alpha {
 String getType() {
 return "beta";
 }
}
public class Gamma extends Beta {
 String getType() {
 return "gamma";
 }
 public static void main(String[] args) {
 Gamma g1 = new Alpha();
 Gamma g2 = new Beta();
 System.out.println(g1.getType() + " "
 + g2.getType());
 }
}

(A) alpha beta
(B) beta beta
(C) gamma gamma
(D) Compilation fails

Level: Practitioner Category of MCQ: inheritance

Question: 80

interface Rideable { String getGait(); }
public class Camel implements Rideable {
 int weight = 2;
 String getGait() { return " mph, lope"; }
 void go(int speed) {
 ++speed; weight++;
 int walkrate = speed * weight;
 System.out.print(walkrate + getGait());
 }
 public static void main(String[] args) {
 new Camel().go(8);
 }
}

(A) 16 mph, lope
(B) 24 mph, lope
(C) 27 mph, lope
(D) Compilation fails

Level: Practitioner Category of MCQ: interfaces

Question: 81

public class Main
{
	public static void main(String[] args) {
		int a = 10;
		
		if(++a==11 || ++a==12)
		++a;
		
		System.out.println(a);
	}
}

(A) 13
(B) 12
(C) 11
(D) 10

Level: Practitioner Category of MCQ: operators

Question: 82

public class Main
{
	public static void main(String[] args) {
		int a = 10;
		
		if(++a==11 && ++a==12)
		++a;
		
		System.out.println(a);
	}
}

(A) 10
(B) 11
(C) 12
(D) 13

Level: Practitioner Category of MCQ: operators

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Java Multiple Choice Questions for Experienced - 82

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