Single inheritance and multiple inheritance The example in Figure 1 illustrates single inheritance in which a child category inherits state and behaviors from one immediate parent category.

Need to add multiple values to a key in a Java HashMap but can't figure out how to do it? Here are three examples of how to solve the multiple values per key problem in Java.

Compare inheritance and composition, the two fundamental ways to relate Java classes, then practice debugging ClassCastExceptions in Java inheritance.