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 [...]
14.1 The Objects Class The following static methods of the java.util.Objects class are convenient to use when comparing objects and computing the hash code for an object. They take away [...]
General Contract of the hashCode() Method The general contract of the hashCode() method stipulates the following: Note that the hash code contract does not imply that objects with equal hash [...]
14.4 Implementing the java.lang.Comparable<E> Interface In order to sort the objects of a class, it should be possible to compare the objects. A total ordering allows objects to be compared. [...]
15.2 Collections The Collection<E> interface specifies the contract that all collections should implement. Some of the operations in the interface are optional, meaning that a collection may choose to provide [...]
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 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 [...]
Output from the program: Click here to view code image class VersionNumberUnsorted array: [(3.49.1), (8.19.81), (2.48.28), (10.23.78), (9.1.1)]Unsorted list: [(3.49.1), (8.19.81), (2.48.28), (10.23.78), (9.1.1)]Unsorted map: {(10.23.78)=5000, (3.49.1)=2000, (8.19.81)=3000, (9.1.1)=6000, (2.48.28)=4000}Sorted [...]
13.14 Contexts for Defining Lambda Expressions In this section, we summarize the main contexts that can provide target types for lambda expressions and method references. Declaration and Assignment Statements Ample [...]