INTRODUCTION TO JAVA

Question 1

Who created Java and when?

Answer 1

Creator: James Gosling
From: Sun Microsystems Inc
Year: 1995
Later Acquired BY: Oracle Corporation

Question 2

a class-based, object-oriented programming language and is designed to have as few implementation dependencies as possible.

Answer 2

JAVA

Question 3

Syntax of Java is similar to:

Answer 3

C/ C++

Question 4

What is the meaning of the slogan WORA

Answer 4

Write Once Run Anywhere

Question 5

Why is Java called Java?

Answer 5

Named after the island where the first coffee was produced, Java Coffee

Question 6

ensures the same Java code can be run on different operating systems and platforms.

Answer 6

Java Virtual Machine

Question 7

Reasons to use Java

Answer 7

1. Easy to Learn
2. Simple to use
3. Open source / FREE
4. Popular
5. Similar syntax with C and C++
6. Allows code to be reused, LOWERS Development COSTS

Question 8

is required and you will see it in every Java
program:

Answer 8

Main Method

Question 9

method to print a line of text to the screen.

Answer 9

Print Method
println();

Question 10

All Java variables must
be identified with unique names
called:

Answer 10

Identifiers

Question 11

Give me examples of primitive data type

Answer 11

byte
short
int
long
float
double
boolean
char

Question 12

Give me examples of non primitive data type

Answer 12

String
Arrays
Classes
Interface
and more…

Question 13

data types are called reference types because they refer to objects

Answer 13

Non primitive

Question 14

These are used to perform common mathematical operations

Answer 14

Arithmetic Operators

Question 15

These are used to assign values to variables

Answer 15

Assignment Operators

Question 16

These are used to compare two values (or variables). The return value is true or false.

Answer 16

Comparison Operators

Question 17

These are used to determine the logic between variables or values.

Answer 17

Logical Operators

Question 18

These are used to perform operations on individual bits of the operands. They are useful for low-level
programming, such as manipulating bits in memory, encryption, compression, etc.

Answer 18

Bitwise Operators

Question 19

This class is part of the java.util package in
Java and is used for reading input from different sources, such
as the keyboard.

Answer 19

java.util.Scanner;

Question 20

Cannot be used for a variable name in java

Answer 20

Keywords (Reserved Words)

Question 20

is an object associated with the standard
input device.

Answer 20

System.in object

Question 21

Scanner method used to read a string value form the user is:

Answer 21

next()

Question 22

There is also a short-hand if else, which is known as the _______ because it consists of three operands.

Answer 22

ternary
operator

Question 23

loop inside another loop.

Answer 23

nested loop

Question 24

is used exclusively to loop through elements in an array.

Answer 24

for each loop

Question 25

The simplest kind of loop in Java

Answer 25

while loop

Question 26

can also be used to jump out of a loop.

Answer 26

Break Statement

Question 27

breaks one iteration (in the loop), if a specified condition occurs, and continues with the next iteration in the loop (parang “skip”).

Answer 27

The continue statement

Question 28

are functions defined within classes

Answer 28

Methods

Question 29

You can pass data, known as________, into a method.

Answer 29

parameters

Question 30

are variables declared within a class.

Answer 30

Global Variables

Question 31

These are variables declared inside a method, condition, loops and any other block of code.

Answer 31

Local Variables

Question 32

You can use the same method name but different parameters so that you will cater every possibility of a method

Answer 32

Overloading methods

Question 33

the technique of making a function call itself.

Answer 33

Recursion

Question 34

To aid in the organization of large code repository, Java allows a group of related type definitions (such as classes) to be grouped into what is known as a

Answer 34

Packages

Question 35

IMPORTING PACKAGES What does importing specific packages look like

Answer 35

import packagename.classname

Question 36

The process of creating an instance of a class so we can use it on our program.

Answer 36

Class instantiation