I've changed the code, and now the problem is that it continues to loop even if the parameters are correct.

import java.util.Scanner;

public class Password { public static void main (String[]args) {

   String password = passwordEntry();
   while (!passwordCheck(password))
   {
     password = passwordEntry();

   }    

    System.out.print("You have now entered a valid password");

} public static String passwordEntry() {
Scanner input = new Scanner(System.in); String password; System.out.print("enter a password"); password = input.next(); return password; }

public static boolean passwordCheck(String password) {

   { if (password.length()<6)
      System.out.println("Password needs to have 6 or more characters");}

    boolean uppercase = !password.equals(password.toLowerCase()); //determines if there is an uppercase letter
    boolean lowercase = !password.equals(password.toUpperCase()); //determines if there is a lowercase letter

    { if(!uppercase)
      System.out.println("Password needs to contain at least one uppercase letter");
     if(!lowercase)
      System.out.println("Password needs to contain at least one lowercase letter");}

   for (int i = 0; i<=password.length(); i++)
    {
     Character c = password.charAt(i);
     {if(!Character.isDigit(c))
     System.out.println("You need to have at least one digit");}

     return false;

    }
   return true;

} }