import java.security.SecureRandom;

public class PasswordGenerator {

    final String lowercaseCharacters = "abcdefghjkmnpqrstuvwxyz";
    final String uppercaseCharacters = "ABCDEFGHJKMNPQRSTUVWXYZ";
    final String digits = "0123456789";

    private int length = 12;
    private boolean useUppercase = true;
    private boolean useLowercase = true;
    private boolean useDigits = true;


    public String generateRandomPassword() {
        StringBuilder generatedPassword = new StringBuilder();
        SecureRandom rand = new SecureRandom();
        String characterPool = "";

        if (isUseLowercase()) {
            characterPool += lowercaseCharacters;
        }
        if (isUseUppercase()) {
            characterPool += uppercaseCharacters;
        }
        if (isUseDigits()) {
            characterPool += digits;
        }

        for (int generatorPosition = 0; generatorPosition < getLength(); generatorPosition++) {
            generatedPassword.append(characterPool.charAt(rand.nextInt(characterPool.length())));
        }
        return generatedPassword.toString();
    }

    public boolean isUseUppercase() {
        return useUppercase;
    }

    public void setUseUppercase(boolean useUppercase) {
        this.useUppercase = useUppercase;
    }

    public boolean isUseLowercase() {
        return useLowercase;
    }

    public void setUseLowercase(boolean useLowercase) {
        this.useLowercase = useLowercase;
    }

    public boolean isUseDigits() {
        return useDigits;
    }

    public void setUseDigits(boolean useDigits) {
        this.useDigits = useDigits;
    }

    public int getLength() {
        return length;
    }

    public void setLength(int length) {
        this.length = length;
    }
}