object « encapsulation « Java Class Q&A

1. using another object's functionality following a proper OO design - encapsulation    stackoverflow.com

I am debating the proper, OO-design to use another object's functionality (methods) from a java class, while both objects remain decoupled as much as possible. For example, at some point in my ...

2. Java Object Oriented Design Question: update internal state or return new object    stackoverflow.com

This is a design question. The design is pseudo-code and represents a small example but I may add a lot more methods, data, logic in the future. In this example, I ...

3. How to encapsulate a third party complex object structure?    stackoverflow.com

Motivation

4. How to avoid tedious null checks on an object    stackoverflow.com

If I have a class that I want to accept an optional logger to log debug information:

public class A {

private Logger logger ; 

public A( Logger logger ) { 
  ...

5. Is there a way to implement the Forwarding Object pattern in Java without boilerplate code?    stackoverflow.com

Since encapsulation is considered better than inheritance (according to Effective Java and other sources), there is a pattern of Forwarding an Object. (I believe the Decorator pattern is a synonym ...