My code asks a user for a password. To properly validate the user's entry, it must include the following requirements:
1)have a length of 5
2)have an uppercase character
3)have a lowercase character
4)have a digit

My loop only works for the lowercase and length of 5 requirements. Can someone help me with validating uppercase and digit? Thanks in advance for any/all suggestions!

Originally Posted by peter_budo

You been on right track, but you just forgot to set counter after each while loop back to zero. Because of that capital letters and digit is never checked.
Also you may consider something like this

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java Syntax (Toggle Plain Text)

import javax.swing.*;
 
public class PasswordCheck
{	
	public static void main(String[] args)
	{
		String input;  
 
		input = JOptionPane.showInputDialog("Please enter password");
 
		// Validate user's input
		if (isValid(input))
		{
			JOptionPane.showMessageDialog(null, "Your password is valid!");
		}
		else
		{
			JOptionPane.showMessageDialog(null, "Your password is invalid " +
					"valid password criteria.");
		}
		System.exit(0);
	}
 
		/**
			The isValid method determines password validity.
			@param passWord The String to test.
			@return true if valid, or else false.
		*/
 
	private static boolean isValid(String pw)
	{
		if(checkLength(pw) && lowCaseCheck(pw) && upCaseCheck(pw) && digCheck(pw))
		{
			return true;
		}
		return false;
	}
 
	private static boolean checkLength(String psw)
	{
		if (psw.length() == 5){return true;}
		return false;
	}
 
	private static boolean lowCaseCheck(String psw)
	{
		for(int i = 0; i < psw.length(); i++)
		{
			if(Character.isLowerCase(psw.charAt(i)))
			{
				return true;
			}
		}
		return false;
	}
 
	private static boolean upCaseCheck(String psw)
	{
		for(int i = 0; i < psw.length(); i++)
		{
			if(Character.isUpperCase(psw.charAt(i)))
			{
				return true;
			}
		}
		return false;
	}
 
	private static boolean digCheck(String psw)
	{
		for(int i = 0; i < psw.length(); i++)
		{
			if(Character.isDigit(psw.charAt(i)))
			{
				return true;
			}
		}
		return false;
	}
}

import javax.swing.*; public class PasswordCheck { public static void main(String[] args) { String input; input = JOptionPane.showInputDialog("Please enter password"); // Validate user's input if (isValid(input)) { JOptionPane.showMessageDialog(null, "Your password is valid!"); } else { JOptionPane.showMessageDialog(null, "Your password is invalid " + "valid password criteria."); } System.exit(0); } /** The isValid method determines password validity. @param passWord The String to test. @return true if valid, or else false. */ private static boolean isValid(String pw) { if(checkLength(pw) && lowCaseCheck(pw) && upCaseCheck(pw) && digCheck(pw)) { return true; } return false; } private static boolean checkLength(String psw) { if (psw.length() == 5){return true;} return false; } private static boolean lowCaseCheck(String psw) { for(int i = 0; i < psw.length(); i++) { if(Character.isLowerCase(psw.charAt(i))) { return true; } } return false; } private static boolean upCaseCheck(String psw) { for(int i = 0; i < psw.length(); i++) { if(Character.isUpperCase(psw.charAt(i))) { return true; } } return false; } private static boolean digCheck(String psw) { for(int i = 0; i < psw.length(); i++) { if(Character.isDigit(psw.charAt(i))) { return true; } } return false; } }