Passay - LengthRule

LengthRule class helps in defining the minimum and maximum length of a password.

Example - Validating Password as per Length Rule

The below example shows validation of an invalid password as per length rules.

PassayDemo.java

package com.tutorialspoint;

import java.util.ArrayList;
import java.util.List;

import org.passay.LengthRule;
import org.passay.PasswordData;
import org.passay.PasswordValidator;
import org.passay.Rule;
import org.passay.RuleResult;

public class PassayDemo {
   public static void main(String[] args) {
        
      List<Rule> rules = new ArrayList<>();        
      //Rule 1: Password length should be in between 
      //8 and 16 characters
      rules.add(new LengthRule(8, 16));        
     
      PasswordValidator validator = new PasswordValidator(rules);        
      PasswordData password = new PasswordData("Micro");        
      RuleResult result = validator.validate(password);
        
      if(result.isValid()){
         System.out.println("Password validated.");
      }else{
         System.out.println("Invalid Password: " + validator.getMessages(result));            
      }
   }
}

Output

Compile and run the code to verify the result −

Invalid Password: [Password must be 8 or more characters in length.]

Example - Validating a Valid Password as per Length Rule

The below example shows validation of a valid password as per length rules.

PassayDemo.java

package com.tutorialspoint;

import java.util.ArrayList;
import java.util.List;

import org.passay.LengthRule;
import org.passay.PasswordData;
import org.passay.PasswordValidator;
import org.passay.Rule;
import org.passay.RuleResult;

public class PassayDemo {
   public static void main(String[] args) {
        
      List<Rule> rules = new ArrayList<>();        
      //Rule 1: Password length should be in between 
      //8 and 16 characters
      rules.add(new LengthRule(8, 16));        
     
      PasswordValidator validator = new PasswordValidator(rules);        
      PasswordData password = new PasswordData("Microsoft");        
      RuleResult result = validator.validate(password);
        
      if(result.isValid()){
         System.out.println("Password validated.");
      }else{
         System.out.println("Invalid Password: " + validator.getMessages(result));            
      }
   }
}

Output

Compile and run the code to verify the result −

Password validated.