How to compile Invalid Object?

Operations such as upgrades, patches and DDL changes can invalidate schema objects.Here are  some  methods  to compile   objects .But I prefer  UTL_RECOMP (from sql  or PL/SQL ) or  $ORACLE_HOME/rdbms/admin/utlrp.sql (From Operting system)

1.  we  can  compile it manually like 
    alter  package serdar.xxx compile  body  ;
2. Manuel by the help  of a  script:we can  spool  the output  and  run it.Note  that  this script is not written for all types  like java classes
   
   Set heading off;
   set feedback off;
   set echo off;
   Set lines 999;
   spool compile.sql
   
   select  'alter '||
   decode(object_type,'SYNONYM',decode(owner,'PUBLIC','PUBLIC SYNONYM '||object_name,
   'SYNONYM '||OWNER||'.'||OBJECT_NAME)||' compile;',
   decode(OBJECT_TYPE ,'PACKAGE BODY','PACKAGE',OBJECT_TYPE)||
   ' '||owner||'.'||object_name||' compile '||
   decode(OBJECT_TYPE ,'PACKAGE BODY','BODY;',' ;'))
   from dba_objects where status<>'VALID'
   order by owner,OBJECT_NAME;
   spool off
   @compile.sql
   
   
   
3. DBMS_DDL.ALTER_COMPILE: The same with "alter   procudere serdar.test compile"
   
   exec dbms_ddl.alter_compile ('PROCEDURE','SERDAR','TEST');
4. DBMS_UTILITY.compile_schema:The COMPILE_SCHEMA procedure in the DBMS_UTILITY package compiles all procedures, functions, packages, and triggers in the specified schema
   
   EXEC DBMS_UTILITY.compile_schema(schema => 'SERDAR');
5. UTL_RECOMP :it will  recompile all invalids.
   
   --Compile  all invalids  in the database
   exec  SYS.UTL_RECOMP.RECOMP_SERIAL ();
   --Compile schema  SERDAR
   exec SYS.UTL_RECOMP.RECOMP_SERIAL ('SERDAR');   
   
   --Compile all invalids in the database parallel (If we  have eneogh  CPU )
   
   exec  SYS.UTL_RECOMP.recomp_parallel(4);
6. UTLRP.SQL  : From  the  operating  system as sysdba.Note that this is an example  for UNIX systems
   
   SQL>@$ORACLE_HOME/rdbms/admin/utlrp.sql