SQL> desc emp
 Name                                      Null?    Type
 ----------------------------------------- -------- ----------------------------
 EMPNO                                     NOT NULL NUMBER(4)
 ENAME                                     NOT NULL VARCHAR2(10)
 JOB                                                VARCHAR2(9)
 MGR                                                NUMBER(4)
 HIREDATE                                           DATE
 SAL                                                NUMBER(7,2)
 COMM                                               NUMBER(7,2)
 DEPTNO                                             NUMBER(2)

SQL> insert into emp (empno, ename) values (9999, '      ')
  2  /

1 row created.


SQL> select length(ename) from emp
  2  where empno = 9999
  3  /

LENGTH(ENAME)
-------------
            6
SQL>

public void setSURNAME(String SURNAME) {
    this.SURNAME = SURNAME == null ? null : SURNAME.trim();
}

public void setSURNAME(String SURNAME) {
    this.SURNAME = SURNAME == null ? null : SURNAME;
}