Java Questions

Introduction JOptionPane is used for the dialog box that prompts users for a value or informs them in a Java program. Most of the methods in the JOptionPane are of showXXDialog For example: showInputDialog -> To prompt user for some input. showMessageDialog-> To tell the user about something. More information: https://docs.oracle.com/javase/8/docs/api/javax/swing/JOptionPane.html Code Listing import javax.swing.JOptionPane; […]

Introduction Let’s look at some of the differences between HashMap and Hashtable in this tutorial. Hashtable is obsolete and we can replace implementations with some derivate of HashMap extensions. Though we talk about the differences in the section both the classes implement the same interfaces Map, Cloneable, and Serializable. HashMap HashMap is not thread-safe and […]

Introduction In this tutorial, we will discuss the differences between Set and List. Set and List are both interfaces in the Java Collection Framework. Both extend the core Collection interface. https://www.testingdocs.com/java-collection-framework/ Set The Set is an unordered collection. The order of the elements in the collection is not guaranteed. The Set doesn’t allow duplicate elements […]

Introduction We can traverse a collection of objects in Java by: using Iterators. using the for-each construct. Iterator public interface Iterator<E> Iterator is an interface in the Java Collection framework that is used to iterate over a collection. An Iterator object enables us to traverse through a collection. We can get an Iterator for a […]

An inner class is a class inside another class. The main purpose of using an inner class is to group related classes together. Java program import java.text.DecimalFormat; public class Item { private String description; // description private int itemNumber; // number private Cost cost; // Cost /** * Item constructor **/ public Item(String desc, int […]

JavaFX API JavaFX API is used for creating GUI rich desktop applications also called as Rich internet applications (RIAs). It is a set of Java libraries designed to enable you to create and deploy rich client applications that have rich UI controls. It can be used to create graphical user interfaces for many platforms. I […]