Java Programs

/** Email Validation
 * String input1="test@gmail.com"
 * 1)@ & : should be present;
 * 2)@ & . should not be repeated;
 * 3)there should be four characters between @ and .;
 * 4)there should be at least 3 characters before @ ;
 * 5)the end of mail id should be .com;
 */

// Using Char array
package programs;

import java.util.Scanner;

public class EmailValidation {
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.println("Enter the Email ID : ");
String email = in.next();
// Converting string into Char array
char[] a = new char[200];
a = email.toCharArray();

int amp = 0;
int dot = 0;
int ampindex = 0;
int dotindex = 0;

for (int i = 0; i < a.length; i++) {
if (a[i] == '@') {
amp++; // amp should be 1
ampindex = i;
} else if (a[i] == '.') {
dot++; // dot should be 1
dotindex = i;
}
}

if (amp == 1 && dot == 1 && ampindex > 2 && (dotindex - ampindex) == 5
&& a[a.length - 1] == 'm' && a[a.length - 2] == 'o'
&& a[a.length - 3] == 'c' && a[a.length - 4] == '.') {
System.out.println("Valid Email");
} else {
System.out.println("Invalid email");
}

}
}