1

00:00:01,140  -->  00:00:04,440
So that's the end of the second chapter through this chapter.

2

00:00:04,530  -->  00:00:08,050
We got started with the Java Language basics.

3

00:00:08,160  -->  00:00:13,440
We have taken a top down approach in learning the concepts that is we first introduced a concept of

4

00:00:13,440  -->  00:00:18,350
object oriented programming by explaining what classes and objects are.

5

00:00:18,750  -->  00:00:24,030
We studied variables methods and constructors in detail which are the chord building blocks of a class

6

00:00:24,030  -->  00:00:24,980
.

7

00:00:25,050  -->  00:00:29,360
We also did our first date structure of course which is an array.

8

00:00:29,440  -->  00:00:34,160
Now let's just look at some of the important points we covered in this chapter.

9

00:00:34,740  -->  00:00:40,350
We started with looking at object oriented programming which helps model real world scenarios in a more

10

00:00:40,350  -->  00:00:41,900
natural way.

11

00:00:42,790  -->  00:00:50,490
Angela An object is used to represent a real world and to be like a student and objects are defined

12

00:00:50,490  -->  00:00:58,040
using a class that is Classes like a blueprint and objects are instances of a class.

13

00:00:58,050  -->  00:00:59,780
Next we look at variables.

14

00:00:59,850  -->  00:01:06,570
A variable is simply a container that holds something and the type of data that a variable can hold

15

00:01:06,990  -->  00:01:12,330
is defined as the variable creation by which set off by stating the variables type.

16

00:01:12,570  -->  00:01:18,210
So once a variable type is defined it can only hold data of that particular type and it cannot hold

17

00:01:18,300  -->  00:01:20,020
any other type of data.

18

00:01:20,320  -->  00:01:28,150
And due to this is refer to as it is tactically type language it variable's type can be either a primitive

19

00:01:28,150  -->  00:01:35,660
type audit class name and we saw that in Java how eight primitive better days.

20

00:01:36,060  -->  00:01:41,760
And we also saw that there are three kinds of variables instance Dodik and local variables instance

21

00:01:41,760  -->  00:01:48,060
variables are unique to each object and they Hallen object stayed static with it was a class variables

22

00:01:48,240  -->  00:01:51,450
that are shared across all objects of the class.

23

00:01:51,690  -->  00:01:58,200
Finally local variables are defined within methods are constructors even method parameters and constructor

24

00:01:58,200  -->  00:02:01,870
parameters are considered as local variables.

25

00:02:02,330  -->  00:02:10,170
When X look that address in Java an array is an object that is it gets stored on the heap like any other

26

00:02:10,170  -->  00:02:12,310
regular Java object.

27

00:02:13,230  -->  00:02:18,960
And it is used to store a fixed number of elements of a single type and that type can be either promote

28

00:02:18,960  -->  00:02:27,640
do or object reference or support fast random access and by fast here we mean constant time.

29

00:02:27,990  -->  00:02:35,120
So accessing 1000th element would pick the same amount of time as accessing the Fifth Element relex

30

00:02:35,130  -->  00:02:43,290
look at methods which basically represent behavior and Jawa always uses pass by value mechanism while

31

00:02:43,290  -->  00:02:46,870
passing data methods even for object references.

32

00:02:46,890  -->  00:02:54,260
We know that it passes a copy of the memory address of the object within that method overloading word

33

00:02:54,300  -->  00:02:55,710
within the same class.

34

00:02:55,770  -->  00:03:01,800
We can have multiple methods with the same name but different parameterless to be considered a valid

35

00:03:01,800  -->  00:03:06,600
overload method parameters must be different.

36

00:03:06,600  -->  00:03:14,070
Finally we look at constructors a concept that is invoked when an object is being created and it is

37

00:03:14,070  -->  00:03:20,850
typically used to initialize object state and we can have multiple ganster person in the same class

38

00:03:20,850  -->  00:03:21,430
.

39

00:03:21,450  -->  00:03:27,660
And this invocation statement is used to invoke an overloaded constructor and disintegrations statement

40

00:03:27,750  -->  00:03:32,880
must also be the first statement in that constructor and that's about it.

41

00:03:32,880  -->  00:03:37,810
Thanks for listening and we will continue learning more language basics in the next chapter.