Creating batch job with 5 classes

Hi All,
I have a requirement in which I have to do five different operations at different time instances.
1.Generate a report at morning 11.00 AM.
2.update a table with more than 6000 rows at night 12.30 AM
3.Generate a second report querying from the database at 10.00 AM Everyday.
4.Generate an automail at 11.30 Am Everyday
All these are plain Java classes and not web components. How could I effectively design the batch job so that it doesnot take nmuch memory and design classes so that they must be reusable like DB connection,Getting a db field value frequently etc.
Can any one help me on this.

http://www.google.com/search?q=job+schedule+in+java&client=netscape-pp&rls=com.netscape:en-US

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