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{{java|AbstractList}} is an example of a ''skeletal implementation'', which leverages and combines the advantages of interfaces and abstract classes by making it easy for the developer to develop their own implementation for the given interface.{{sfn|Bloch|2018|loc=Chapter §4 Item 20: Prefer interfaces to abstract classes|pp=99-103}}
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The '''{{Javadoc|module=java.base|package=java.util|class=ArrayList|monotype=y}}''' class implements the <code>List</code> as an array. Whenever functions specific to a <code>List</code> are required, the class moves the elements around within the array in order to do it.
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