Java in Tamil - Enumeration (enum) for Beginners from Basics - Muthuramalingam - Payilagam

Enumeration (enum) for Beginners from Basics -Java in Tamil . Payilagam
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Thank you so much sir

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ENUM acts like json objects

[@arunsekar6341]

Sir enum create pannitu, 5 constants define panniten , then default constructor create pannitu adhukula syso("Test") nu potta, it displays Test as 5 times when I just call 1 cnstats with its enum class.
public class HandleLocators {
enum Locator{

ID, NAME, CLASSNAME, LINKTEXT(4), PARTIALLINKTEXT, TAGNAME, CSSSELECTOR, XPATH;

int a;
Locator(int a){
System.out.println("parameter Constructor");
this.a=a;
}

Locator(){
System.out.println("Default Constructor");
}
}
public static void main(String[] args) {
// TODO Auto-generated method stub
HandleLocators obj1 = new HandleLocators();

obj1.clickElement("", Locator.LINKTEXT);
}

public void clickElement(String elementValue, Locator locatorType){
switch(locatorType){
case ID:
System.out.println("This is ID");
break;
case NAME:
System.out.println("This is NAME");
break;
case CLASSNAME:
System.out.println("This is CLASSNAME");
break;
case LINKTEXT:
System.out.println("This is LINKTEXT");
break;
case PARTIALLINKTEXT:
System.out.println("This is PARTIALLINKTEXT");
break;
case TAGNAME:
System.out.println("This is TAGNAME");
break;
case CSSSELECTOR:
System.out.println("This is CSSSELECTOR");
break;
case XPATH:
System.out.println("This is XPATH");
break;

}
}
}
Output:
Default Constructor
Default Constructor
Default Constructor
parameter Constructor
Default Constructor
Default Constructor
Default Constructor
Default Constructor
This is LINKTEXT
How am I getting this output? Why its calling the constructor 8 times when I called the enum constants only once.
Please give me your reply.. I understand it but I am confused due to this behaviour.

[@kavin2758]

I am not sure bro but this might help you.
HandleLocators obj1 = new HandleLocators();
obj1.clickElement("", Locator.LINKTEXT);
in above u called the LINKTEXT constant one time but in this statement HandleLocators obj1 = new HandleLocators(); we have constrcutor, first it will look for default constructor in our program so u specified default constructor in ur enum.
Locator(){
System.out.println("Default Constructor");
}
And u given only one parameter to one constant LINKTEXT(4), remaining 7 constants u don't specify the parameter ID, NAME, CLASSNAME, PARTIALLINKTEXT, TAGNAME, CSSSELECTOR, XPATH.
SO while executing new HandleLocators(); constructor will look for def. constructor with 7 constants so it executed 7 times Default Constructor and one time parameter Constructor in ur result. I am still in learning phase, correct me if I am wrong.

[@saieswariamaran9003]

To my understanding, your 'enum' constructor is called 8 times (7 times default and 1 time parameterized) because, u have 8 enum objects (ID,NAME,CLASSNAME,LINKTEXT(4),PARTIALLINKTEXT,CSSSELECTOR,TAGNAME,XPATH).
The first time you call for an enum object ,here in your case this line ---> [ obj1.clickElement("",Locator.LINKTEXT) ], all objects gets initialized/assigned. (Here your are accessing the LINKTEXT object from the enum Locator).
To try this, try to access a second enum object and see, you will not get the constructor messages again.
Also, you did not provide a default constructor for 'HandleLocators' class, hence while creating the object obj1 in this line --> [ HandleLocators obj1 = new HandleLocators(); ], the compiler will provide one.