Automation

Introduction An identity matrix is a square matrix of dimension n which contains ones along the principal diagonal and zeros in the rest of the other positions. A 2×2 matrix is as follows: 1    0 0    1 4×4 Identity Matrix Example For example, 4×4 matrix is shown below.   Java Program Please note that Java […]

How to create a Singleton class? Using the Singleton pattern, you should have only one object of a particular class throughout your code. The Singleton class design is to make sure that you can instantiate only one object of a particular class. You need to restrict the new operator by creating more objects than 1 […]

Introduction The insertion sort technique is similar to sorting playing cards in our hands. We pick a card and place it in the sort order. When we complete this process with all the cards the array will be sorted. A sample array sorting is shown in the below picture:   Java Program import java.util.InputMismatchException; import […]

Overview StringTokenizer class is mostly used to break a string based upon a set of delimiter tokens. You can then call the Enumeration methods to loop through the elements. Class Diagram   The set of delimiters are the characters that separate tokens. They can be specified either at creation time or on a per-token basis. […]

Introduction Before writing a simple program to convert date format, we will look at some Java classes which will be useful for the program. The class Date represents a specific instant in time, with millisecond precision. We can use DateFormat class to format and parse date strings. DateFormat DateFormat is an abstract class for date/time […]

Overview JavaBeans are POJO ( Plain Old Java Objects ) classes that encapsulate objects into a single entity called Bean. They are serializable, have a zero-argument constructor. The main property of the Bean class is, it allows access to its properties by using getter and setter methods. These methods are called accessor and mutator methods […]