Validation in java

1. Name Validationimport java.io.*;public class Name{public boolean nameValidate(String name){char [] str = new char[name.length()];name.getChars(0, name.length(), str, 0);for(int i = 0; i<str.length; i++){if((Character.getNumericValue(str[i])<10 || Character.getNumericValue(str[i])>35)&& Character.isSpaceChar(str[i])==false){return false;} }return true;}

public static void main(String[] args)throws IOException { Name main = new Name();BufferedReader br=new BufferedReader(new InputStreamReader(System.in));System.out.println("Enter Name Note:does not enter special characters");String name=br.readLine();if(main.nameValidate(name)) System.out.println("valid");else System.out.println(" Not valid"); }}

2. Number Validationimport java.io.*;public class Number { public boolean containsOnlyNumbers(String str) { //It can't contain only numbers if it's null or empty... if (str == null || str.length() == 0) return false; for (int i = 0; i < str.length(); i++) {

if (!Character.isDigit(str.charAt(i))) return false; } return true; }

public static void main(String[] args)throws IOException { Number main = new Number();BufferedReader br=new BufferedReader(new InputStreamReader(System.in));System.out.println("Enter Number");String name=br.readLine();if(main.containsOnlyNumbers(name)) System.out.println("");else System.out.println("plz enter number only"); }}

3. Date validationimport java.util.Date;import java.text.ParseException;

import java.text.DateFormat;import java.text.SimpleDateFormat;import java.io.*;public class DateValid{public boolean isValidDate(String date){ SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy"); Date testDate = null; try { testDate = sdf.parse(date); }

catch (ParseException e) {

return false; }

if (!sdf.format(testDate).equals(date)) { return false; }

return true;

} public static void main(String args[]) throws IOException{BufferedReader br=new BufferedReader(new InputStreamReader(System.in));System.out.println("enter date");String s=br.readLine();DateValid dv = new DateValid();if(dv.isValidDate(s))System.out.println("true");elseSystem.out.println("false");

}}

4. Email Validation

import java.util.regex.*;

import java.io.*;

public class EmailValidation

{

public static void main(String []args) throws IOException

{

String email;

System.out.println("enter EmailId");

BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

email=br.readLine();

Pattern p=Pattern.compile("[a-zA-Z]*[0-9]*@[a-zA-Z]*.[a-zA-Z]*");

Matcher m=p.matcher(email);

boolean b=m.matches();

if(b==true)

{

System.out.println("Valid Email ID");

}

else

{

System.out.println("InValid Email ID");

}

}

}

5. Special Character validation

import java.io.*;

public class NameNumber

{

public boolean containsOnlyNumbers(String str) {

//It can't contain only numbers if it's null or empty...

if (str == null || str.length() == 0)

return false;

for (int i = 0; i < str.length(); i++)

{

if (Character.isLetterOrDigit(str.charAt(i)))

return false;

}

return true;

}

public static void main(String[] args)throws IOException

{

NameNumber main = new NameNumber();

BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

System.out.println("Enter alphanumeric String");

String name=br.readLine();

if(main.containsOnlyNumbers(name))

System.out.println("Not valid");

else

System.out.println("valid");

}

}