*/ private void verifyNameProperty(String aName) { boolean nameHasContent = (aName != null) && (!aName.equals("")); if (!nameHasContent) { throw new IllegalArgumentException( "Names must be non-null and non-empty."); } StringCharacterIterator iterator = new StringCharacterIterator(aName)...
A linked list is a data structure that consists of a sequence of nodes, where each node stores an element and a reference to the next node. In Java, the
In Java, an iteratoris an interface and is implemented by all collection classes. The Java collections framework is a group of classes and interfaces that implement reusable collection of data structures. The iterator method returns an object that implements the Iterator interface. An object of an ...
An iterator in Java provides the means to access elements of a collection one-by-one in a sequential, unidirectional and non-repeatable manner. This is useful in cases when the size of the collection is not known beforehand or when the collection does not expose suitable methods to access a ...
void remove( )removes the current element. ThrowsIllegalStateExceptionif an attempt is made to call remove( ) that is not preceded by a call to next( ). By using this iterator object, you can access each element in the collection, one element at a time. ...
Java collection framework is pretty amazing. Collection class consists exclusively of static methods that operate on or return collections. Those
We can usethePriorityQueueclassto implement the heaps in Java. The class implements the min-heap by default, and we can use thereverseOrder()method from Collections to implement the max-heap. We can use thepeek()method to display the element from the root node in a heap. Thepoll()method...
security.Principal; import java.util.Iterator; import javax.servlet.ServletException; import javax.servlet.http.HttpSession; public interface Session { public static final String SESSION_CREATED_EVENT = "createSession"; public static final String SESSION_DESTROYED_EVENT = "destroySession"; public String...
In this tutorial, we learned aboutComparatorinterface ofJava collection framework. It helps in imposing a total order on objects without any change to the source code of that class. We learned to sort list and array of custom objects. We also learned toreverse sortandimplement group by sort ...
1. When to use proxy design pattern A proxy object hides the original object and control access to it. We can use proxy when we may want to use a class that can perform as an interface to something else. Proxy is heavily used to implement lazy loading related usecases where we do not...