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Java Objective Questions (MCQs) - 225

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Question: 181

Enum is most useful in creating

(A) Singletons
(B) Java Beans
(C) Transactions
(D) None of the above

Level: Expert Category of MCQ: classesAndobjects

Question: 182

Which is the base class of all the exceptions & errors in Java?

(A) Exception
(B) Throwable
(C) JavaBase
(D) Error

Level: Expert Category of MCQ: exceptions

Question: 183

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: 184

Which of the following exception is Checked exception?

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

Level: Beginner Category of MCQ: exceptions

Question: 185

Which exception is thrown by following code?

public class Main
{
public static void main(String[] args) {
	int a = Integer.parseInt("123A");
	System.out.println(a);
}
}

(A) NumberFormatException
(B) IllegalArgumentException
(C) RuntimeException
(D) ParseException

Level: Expert Category of MCQ: exceptions

Question: 186

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: 187

Can we define main() method inside abstract class?

(A) Yes
(B) No

Level: Practitioner Category of MCQ: interfaces

Question: 188

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: 189

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: 190

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: 191

Where is Reference variables allocated?

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

Level: Beginner Category of MCQ: referencevar

Question: 192

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: 193

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: 194

 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: 195

 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: 196

Which of the following reference types cannot be generic?

(A) Anonymous inner class
(B) Interface
(C) Inner class
(D) All of the mentioned

Level: Expert Category of MCQ: classesAndobjects

Question: 197

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: 198

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: 199

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: 200

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

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Java Objective Questions (MCQs) - 225

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