Java Questions

Code Listing Let’s write a simple java program that displays the current date and time on the console window. package com.testingdocs.datetime; //DateDemo.java //www.TestingDocs.com import java.util.GregorianCalendar; import java.util.Calendar; public class DateDemo { public static void main(String args[]) { GregorianCalendar date = new GregorianCalendar(); int currentDay = date.get(Calendar.DAY_OF_MONTH); int currentMonth = date.get(Calendar.MONTH); int currentYear = date.get(Calendar.YEAR); int […]

How to overload a Constructor in Java In this tutorial, we will learn to overload constructor methods in Java with an example. We would take the Dog class as an example. We will create two constructors for the class. The default no-arg constructor and an overloaded constructor that accepts the object arguments in the parameters. […]

Introduction In this tutorial, we will learn the difference between static variables and instance variables in Java language. Static variables Static variables belong to the class. There are also known as class variables. countDogObjects is a static int variable in the example. static variables have a single copy of the variable for the class and […]

How to pass an array to a method in Java In Java, methods are used to break the Java program into small modules. These methods are used to call from other methods. The caller method can pass data to the methods as parameters. The data that is being passed from the caller or invoking method […]

What is a String? A String is a sequence of characters and the String class is contained in standard java.lang package. Using the object of this class we can manipulate the series if characters. Strings are constant and immutable in Java. String values cannot be changed after they are created. If we need mutable Strings […]

String methods in Java In this post, we will learn basic String class methods that we use frequently when we deal with Strings in Java. Some of the methods are: length() substring() trim() String basic handling can be found here: https://www.testingdocs.com/questions/string-handling-in-java/ length() This method returns the length of the String. In other words, this method […]