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Deferred printing in Java
Table
----------------------
Name    |Surname     |
----------------------
Mike    |Mikhailowish|
Rafaello|Mirena      |

System.out.printLater(s); //herejust leave a pointer to a StringBuilder you will build
...
s.append("--------");
...
System.out.printAllDeferred();

for (String name : columnNames) {

    select max(LEN(columnName)) as maxchar from YourTable

}