Constructor References A constructor reference is similar to a static method reference, but with the keyword new instead of the static method name, signifying that a constructor of the specified [...]
15.4 Sets The Java Collections Framework provides the Set<E> interface to model the mathematical set abstraction. The Set<E> Interface Unlike other implementations of the Collection<E> interface, implementations of the Set<E> [...]
Field Comparisons Equivalence comparison involves comparing relevant fields from both objects to determine if their logical states match. For fields that are of primitive data types, their primitive values can [...]
Using the forEachRemaining() Method A convenient way to perform a task on each element of a collection is to use the forEachRemaining() method of the Iterator<E> interface. This method requires [...]
Cast Expressions The context of a cast expression can provide the target type for a lambda expression or a method reference. In the two statements below, the cast provides the [...]
Using the forEach() Method to Iterate Over a Collection The default method forEach() of the Iterable<E> interface (which the Collection<E> interface implements) allows us to do away with an explicit [...]
Using the removeIf() Method to Filter a Collection The following default method of the Collection<E> interface makes the task of filtering a collection much easier, as no explicit iteration is [...]
14.5 Implementing the java.util.Comparator<E> Interface The java.util.Comparator<E> interface is a functional interface and is designated as such with the @FunctionalInterface annotation in the Java SE API documentation— in other words, [...]
The String class implements the Comparable<E> interface, providing an implementation of the compareTo() method. The compareTo() method defines the natural ordering for strings, which is lexicographical. The natural ordering is [...]
Core Interfaces The generic Collection<E> interface is a generalized interface for maintaining collections, and is the root of the interface inheritance hierarchy for collections shown in Figure 15.1a. These generic [...]