Find List of Players That use Same IP in MySql DataBase in Java
public boolean checksameip(Player player, String IP){
    boolean ret = false;
    String playername = player.getName();
    try{
        Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/WebCom", "root", "MyPW");


        Statement stmt = (Statement) con.createStatement();

        ResultSet rs = stmt.executeQuery("SELECT PlayerName FROM IPDataBase WHERE IP='"+IP+"'");

        if(rs.next()){
        //there are results

            //have no clue what to put here :S


        }else{

            ret = false;
        }


        con.close();

    }catch(Exception e){

        logm("Could Not Send Data To MYSQL DATABASE SERVER");
    }

    return ret;
}

public String[] getPlayersWithIP(String ip) {
    try{
        Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/WebCom", "root", "MyPW");
        Statement stmt = (Statement) con.createStatement();
        ResultSet rs = stmt.executeQuery("SELECT PlayerName FROM IPDataBase WHERE IP='"+ip+"'");
        HashSet<String> result = new HashSet<String>();
        int i=0;
        while(rs.next()){
            result.add(getString("PlayerName"));
        }
        con.close();
        return result.toArray(new String[0]);
    }catch(Exception e){
        logm("Could Not Send Data To MYSQL DATABASE SERVER");
        return new String[0];
    }
}