if(Arrays.asList(Owners).contains(loginNo))

import java.util.*;

class  Arrays_asList
{
    public static void main(String[] args) 
    {
        String[] Owners=new String[]{"aaa","abc","acd"};
        String loginNo="abc";
        if(Arrays.asList(Owners).contains(loginNo)) {
            System.out.println("(Owners).contains(loginNo):"+loginNo);
        }
        
    }
}
//(Owners).contains(loginNo):abc