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import java.util.*; /*This form of importing classes makes all classes in package java.util available by name, could be used instead of the import declaration in the previous example. */ import java.*; /*This statement is legal, but does nothing, since there are no classes directly in package java.
java.lang: basic language functionality and fundamental types that is available without the use of an import statement. java.util: collection data structure classes java.io: file operations java.math: multiprecision arithmetics java.nio: the Non-blocking I/O framework for Java java.net: networking operations, sockets, DNS lookups, ... java.security
// DeadStoreExample.java import java.util.ArrayList; import java.util.Arrays; import java.util.List; public class DeadStoreExample {public static void main (String [] args) {List < String > list = new ArrayList < String > (); // This is a Dead Store, as the ArrayList is never read.
Such classes can be referenced by using fully qualified names, or by importing only selected classes with different names. To do this, Java allows importing a single class (e.g., import java.util.List). C# allows importing classes under a new local name using the following syntax: using Console = System. Console.
import java.util.List; import java.util.ArrayList; class Originator {private String state; // The class could also contain additional data that is not part of the // state saved in the memento.. public void set (String state) {this. state = state; System. out. println ("Originator: Setting state to "+ state);} public Memento saveToMemento {System. out. println ("Originator: Saving to Memento."
While the library classes java.util.Observer and java.util.Observable exist, they have been deprecated in Java 9 because the model implemented was quite limited. Below is an example written in Java that takes keyboard input and handles each input line as an event.
java.util.Collection class and interface hierarchy Java's java.util.Map class and interface hierarchy. The Java collections framework is a set of classes and interfaces that implement commonly reusable collection data structures. [1] Although referred to as a framework, it works in a manner of a library. The collections framework provides both ...
The Visitor [1] design pattern is one of the twenty-three well-known Gang of Four design patterns that describe how to solve recurring design problems to design flexible and reusable object-oriented software, that is, objects that are easier to implement, change, test, and reuse.