looping credentials as array in webdriver java

I'm new to web driver. Please help me to loop login credentials as the array and loop it.

mean
usernames : a,b,c,d
passwords : 1,2,3,4

I have to loop it

String[] usernameArray={"John","Mary","Luke"};
String[] passwordArray={"jMan21","maree34","skywalker"};

if(username.equals(usernameArray) && password.equals(passwordArray)) {
    JOptionPane.showMessageDialog(null,"Welcome "+username+"\n"+"You are logged in as: "+logZone,"Log in",JOptionPane.INFORMATION_MESSAGE);
}
else {
    JOptionPane.showMessageDialog(null,"Incorrect login or password","Error",JOptionPane.ERROR_MESSAGE);
}