"new" resulting brittle code

A client developer on one my projects commented that using the keyword "new" results in brittle code and creates interclass dependencies.
Why would this result in brittle code?
Which design patterns alleviate these interclass dependencies?
Thanks in advance

A client developer on one my projects commented that
using the keyword "new" results in brittle code and
creates interclass dependencies.
Why would this result in brittle code?It's a bit of an overgeneralization, but the point is that if you do Foo foo = new FooImpl(); then you are coupling that code to a specific implementation of Foo. If you find a reason to use a different implementation, you have to change the code. You don't get to decide the implementation at runtime.
This is not always a bad thing. You don't go around specifying or optimizing implementations for every single type at runtime. However, as a slightly extreme example, it would be a bad idea in a JDBC context to do Connection con = new com.oracle.jdbc.Connection() (assuming that were the actual class name and it had a public constructor).
Which design patterns alleviate these interclass
dependencies? Abstract Factory or Factory Methd I guess.

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How to create new logical function codes for Subinfotype

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I'm developing an WF that must be started when the user makes any change in a employee position. The problem is that this change can be made by many transactions, I know that it´s possible to do it by PA30/PA40, and today it´s made here using PP01. The Functional Consultant said to me that the better way to map all possible trasactions which made that kind of changes in an employee data is by adding new "Logical Funcion codes" (or Activities) for our specif subinfotypes.
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"new" resulting brittle code

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