|| Java with Selenium || Lecture-13 || Wrapper Class In Java || Automation testing || Java
#Wrapper_Class:-
A Wrapper class in Java is one whose object wraps or contains primitive data types. When we create an object to a wrapper class, it contains a field and in this field, we can store primitive data types. In other words, we can wrap a primitive value into a wrapper class object
1. Normally data are store in two format
a. Primitive format
b. Object format
2. String s="welcome";//primitive type
String s= new String("welcome");//object type
but we want to create object for normal primitive data type we can not used,so in stead we have to use something called wrapper class
int x=100;//normal primitive type
int x= new int(10);//not used
3. for every primitive type there is a wrapper class is available for example int we used Integer wrapper classes
Integer x= new Integer(10);
4. int-Integer
float-Float
double-Double
char- Character
boolea-Boolean
5.one advantage is we can create variable/data in object format
other adv is we can convert the data into one format to another format
example1.
String price1="150.50";
String price2="120.50";
when we add price1+price2=not add but both string are in concat operation ,not add
in this case we can convert string int integer type and then add.
example-2.
text box or input filed are directly allowed data in string format not integer
text box is not allowed the numeric format directly for this we can used wrapper class having build-in methods
Scenario 1
we can convert String-------------int double Boolean char
String--------------Primitive type
Scenario 2
Int, double, Boolean, char--------------String type
primitive type======================String type
example:=
String----int
i want to convert String into int format ,what is a target type that is integer type so we have to used integer wrapper class, inside this class there is a static method available which is parseint(string value).
Integer.parseInt(string value);
String---double Double.parseDouble(string value)
string---Boolean Boolean.parseBoolean(string value)
String---char not possible
because string is collection of character but character is what single character
any data type----string
String.valueOf();-----convert all primitive data type into string format
Need of Wrapper Classes:-
There are certain needs for using the Wrapper class in Java as mentioned below:
They convert primitive data types into objects. Objects are needed if we wish to modify the arguments passed into a method (because primitive types are passed by value).
The classes in java.util package handle only objects and hence wrapper classes help in this case.
Data structures in the Collection framework, such as ArrayList and Vector, store only objects (reference types) and not primitive types.
An object is needed to support synchronization in multithreading.
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Video link:-
#javawithselenium
1. 1st video link: -th-cam.com/video/oZ4hz91MfX4/w-d-xo.html (Intro of java-selenium)
2. 2nd video link:-th-cam.com/video/tE4d0fFMSKI/w-d-xo.html (Selection Statement)
3. 3rd video link:- th-cam.com/video/aWfyTqTKq-g/w-d-xo.html (Iterative Statement)
4. 4th video link:-th-cam.com/video/Yx4Tk0eU3fs/w-d-xo.html (Transfer Statement)
5. 5th video link:- th-cam.com/video/mWNrpMd75t0/w-d-xo.html (1 D Array)
6. 6th video link:- th-cam.com/video/1EoqWpD60jk/w-d-xo.html (2 D array)
7. 7th video link:- th-cam.com/video/_i8wx6zVjkg/w-d-xo.html (Operator in Java)
8. 8th Video Link:- th-cam.com/video/XDTu1jm9L0g/w-d-xo.html (String in java ,part -01)
9. 9th video Link:- th-cam.com/video/R14TdlG9ioI/w-d-xo.html (String In Java, Part-02)
10.10th video Link:-th-cam.com/video/dxGk40JWmew/w-d-xo.html (String in Java Part-3)
11. 11th video Link:- th-cam.com/video/dd2l9PnqJDM/w-d-xo.html (String in java Part-4)
12. 12th video link:- th-cam.com/video/0145QuqT7Do/w-d-xo.html (Scanner class)
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