Weekly Assignment APP - Viva

Which package is required to use the Scanner class in Java?

• java.io

• java.util

• java.lang

• java.scanner

What is the difference between nextInt() and nextLine() in the Scanner class?

• nextInt() reads a whole line, nextLine() reads only an integer

• nextInt() reads an integer, nextLine() reads a full line of text

• Both read only numbers

• Both read only strings

Which statement about BufferedReader and Scanner is correct?

• Scanner is faster than BufferedReader

• BufferedReader can directly parse integers and doubles, while Scanner cannot

• Scanner is easier to use for parsing primitives, while BufferedReader is faster for reading large inputs

• Both are identical in performance and usage

What is the key difference between a while loop and a do-while loop in Java?

• while loop executes at least once, do-while may not execute
  

• do-while loop executes at least once, while may not execute

• Both behave the same

• do-while cannot use break or continue

What will be the output of this code?

int i = 1;

do {

System.out.print(i + " ");

i++;

} while(i < 1);

• No output

• 1

• 1 2

• Infinite loop

What is the main purpose of a constructor in Java?

• To create objects

• To initialize object values

• To destroy objects

• To call methods automatically

What is it called when a class has multiple constructors with different parameter lists?

• Constructor overriding

• Constructor inheritance

• Constructor overloading

• Constructor chaining

Which of the following statements is true about constructors in Java?

• A constructor must have a return type

• A constructor can be private

• A constructor can be called directly like a method

• A constructor cannot be overloaded

Why are getter and setter methods used for private variables in Java?

• To hide data and provide controlled access

• To make variables global

• To avoid using constructors

• To increase performance

Which access modifier allows the widest visibility in Java?

• private

• protected

• public

• default (no modifier)