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The subject line says it all.
Googling DAL & DAO returns only C# .NET related results.
Is there a DAL/DAO equivalent pattern in the Java world?
Are there any reference implementations available?
Of course it applies to Java as well: Don’t Repeat The DAO!
Have a look at Fowler’s Patterns of Enterprise Application Architecture. Core J2EE Patterns also refers to DAO.
It’d be interesting to check the dates on your C#/.NET references. I’d bet that the idea started on the Java side and was adopted later by .NET. Microsoft probably had another persistence technology that was their “best practice”. If I recall correctly, VB used to tie UI elements closely to columns, without an intermediate layer in-between to separate the view from the database.