CODEWITHSUNDEEP
java
Sameek Mishra
Sameek Mishra

Reputation: 9384

how to create a custom datatype in java?

I want to create an custom datatype in Java,for example datatype Email , that having following method isValidate(String email),isEmailExist(String email),getDomain(String email), get Id(String email),just like Integer class in java.

Integer is a class and I can initialise the object of Integer class as follows:

Integer i = 100;

I created my class Email and I want to initialise it as follows 

Email e = "sam";

How can i perform this functionality in my Email class.

import java.util.StringTokenizer;
import java.util.regex.Matcher;
import java.util.regex.Pattern;



public class Email
{
   private String email;
    public Email(String email)
    {
        this.email=email;
    }



Email() {  
}

public Boolean isvalid(String email)
{




String lastToken = null;
   Pattern p = Pattern.compile(".+@.+\.[a-z]+");
   // Match the given string with the pattern
   Matcher m = p.matcher(email);
   // check whether match is found
   boolean matchFound = m.matches();
   StringTokenizer st = new StringTokenizer(email, ".");
   while (st.hasMoreTokens())
   {
      lastToken = st.nextToken();
   }



if (matchFound && lastToken.length() >= 2
      && email.length() - 1 != lastToken.length())
   {
      return true;
   }
   else
      return false;
   }
  public String toString() {
    return email;
    }
}

Thanks

Upvotes: 1

Views: 24698

Answers (2)

Viktor Mellgren
Viktor Mellgren

Reputation: 4506

You cannot instantiate it as you write, the closest would be using a constructor:

Email e = new Email("Sam");

Upvotes: 6

Dan Grossman
Dan Grossman

Reputation: 52372

Create an Email class. Java 101; any book or free tutorial of the Java language will get you started.

Upvotes: 3

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