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PasswordValidation.java

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import java.util.*;

class MyException extends Exception{

MyException(String msg){

super(msg);

}

}

class PasswordValidation{

public static void main(String [] args){

Scanner sc=new Scanner(System.in);

System.out.println("Password must contain one digit, one uppercase character, one lowercase character and length should be greater than equal to 8");

System.out.println("Enter password : ");

String y=sc.nextLine();

int ctd=0,ctu=0,ctl=0;

try{

if(y.length()<8)

throw new MyException("Too short password!");

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

if(y.charAt(i)>='0'&&y.charAt(i)<='9'){

ctd++;

}

if(y.charAt(i)>='A'&&y.charAt(i)<='Z')

ctu++;

if(y.charAt(i)>='a'&&y.charAt(i)<='z')

ctl++;

}

if(ctd==0&&ctl==0&&ctu==0)

throw new MyException("No Digit , no uppercase and no lower case!");

else if(ctd==0&&ctl==0)

throw new MyException("No Digit and no lowercase!");

else if(ctl==0&&ctu==0)

throw new MyException("No lowercase and no uppercase!");

else if(ctd==0&&ctu==0)

throw new MyException("No digit and no uppercase!");

else if(ctd==0)

throw new MyException("No Digit!");

else if(ctu==0)

throw new MyException("No Uppercase character!");

else if(ctl==0)

throw new MyException("No Uppercase character!");

System.out.println("correct password");

}

catch(MyException e){

System.out.println(e.getMessage());

}

}}