分表的hash算法

public static void main(String[] args) throws Exception {
        SysConsole.out.println(findTables("student", "10w0", 20 ) ) ;
    }
　　// 20张表 0-19
    public static String findTables(String tableName, String session, int tableNum) {
       int code =  session.hashCode();
       int table = ( code > 0 ? code : (-code) ) % tableNum;
       return tableName + "_" + table;
    }