Packages and Interfaces - Objective Type Questions with Answers on Core Java

Sports GK Questions and Answers 2024 (Latest Updated)

Awards & Honours GK Questions 2024 (Latest Updated)

Questions
1 Math class belongs to the package
A java.math
B java.lang
C java.util
D none of these

Answer: Option [B]

java.lang package contain math class. This class contain basic methods to perform mathematical operations.

2 What class must be extended by all event classes?
A java.util.EventListener
B java.awt.AWTEvent
C java.util.EventObject
D java.awt.event.InputEvent

Answer: Option [C]

java.awt, java.awt.event and java.beans uses the class java.util.EventObject

Advertisement
Article and Schedule Quiz Start Test!
DOWNLOAD CURRENT AFFAIRS PDF FROM APP
3 What is the name of the Collection interface used to represent elements in a sequence?
A Collection
B Set
C List
D Map

Answer: Option [C]

The List is a collection interface which permits duplicates and represent elements in a particular order.

4 Which of the following statement is false?
A Variables declared inside of interface declaration may be changed by implementing class
B Interfaces are designed to support dynamic method resolution at run time
C When an interface method is implemented it must be declared as public
D Variables declaration are implicitly final

Answer: Option [A]

Java interface variables are static and final. They cannot be changed.

5 Which of the following classes directly implement Set interface?
A Vector
B HashSet
C LinkedList
D HashTable

Answer: Option [B]

Random GK Questions

Q. The Lucknow Pact of 1916 was made between:
Q. Judges of the district court are appointed by:
Q. From each according to his capacity, to each according to his needs is:
Q. When there are two electrons in the same orbital, they have:
Q. Nitrogenous food is
Q. The largest exporter of mineral oil is

Take Mock Tests

Missiles Mock Test Start Test!
SSC MTS Mock Test Start Test
IBPS CLERK MOCK TEST Start Test
SSC MTS 2022 JULY 26 Shift 1 (ENGLISH) Start Test!
SSC GD Previous Year Paper 2021 Nov 17 Shift - I (Hindi) Start Test!
SSC CGL Tier - 1 PYP 2022 April 21 Shift- 1 (ENGLISH) Start Test!
MPSC PAPER I MOCK TEST 1 (ENGLISH) Start Test!
IB Security Assistant Mock test 1 (english) Start Test!
UP POLICE CONSTABLE MOCK TEST 1 Start Test!
DELHI POLICE CONSTABLE MOCK TEST 1 (HINDI) Start Test!

Chapters

Assam Direct Recruitment Test Series

Computer Science Topics