Search results
Results from the WOW.Com Content Network
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 ...
Dead store example in Java: // 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.
The hash function in Java, used by HashMap and HashSet, is provided by the Object.hashCode() method. Since every class in Java inherits from Object, every object has a hash function. A class can override the default implementation of hashCode() to provide a custom hash function more in accordance with the properties of the object.
Collection classes are Java API-defined classes that can store objects in a manner similar to how data structures like arrays store primitive data types like int, double, long or char, etc., [2] but arrays store primitive data types while collections actually store objects. The primitive wrapper classes and their corresponding primitive types are:
Here is a small excerpt from the definition of the interfaces java.util.List and java.util ... a generic Java class, ... and Object arrays), and generics in Java.
Introduced in the Java JDK 1.2 release, the java.util.Iterator interface allows the iteration of container classes. Each Iterator provides a next() and hasNext() method, [ 18 ] : 294–295 and may optionally support a remove() [ 18 ] : 262, 266 method.
Java offers a set of overloaded binarySearch() static methods in the classes Arrays and Collections in the standard java.util package for performing binary searches on Java arrays and on Lists, respectively. [72] [73] Microsoft's .NET Framework 2.0 offers static generic versions of the binary search algorithm in its collection base classes.
Since JDK 1.2, Java has included a standard set of collection classes, the Java collections framework. Doug Lea, who also participated in the Java collections framework implementation, developed a concurrency package, comprising several concurrency primitives and a large battery of collection-related classes. [19]