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GregorianCalendar is a concrete implementation of a Calendar class that implements the normal Gregorian calendar with which you are familiar. We did not discuss Calendar class in this tutorial, you can look up standard Java documentation for this.The getInstance( ) method of Calendar returns a GregorianCalendar initialized with the current date and time in the default locale and time zone. GregorianCalendar defines two fields: AD and BC. These represent the two eras defined by the Gregorian calendar.There are also several constructors for GregorianCalendar objects −Sr.No.Constructor & Description1GregorianCalendar()Constructs a default GregorianCalendar using the current time in the default time zone with the default ... Read More
With JDK 7, we can create a gradient based translucent window using swing very easily. Following are the steps needed to make a gradient-based translucent window. Make the background of JFrame transparent first.frame.setBackground(new Color(0, 0, 0, 0)); Create a gradient paint, and fill the panel.JPanel panel = new javax.swing.JPanel() { protected void paintComponent(Graphics g) { Paint p = new GradientPaint(0.0f, 0.0f, new Color(R, G, B, 0), getWidth(), getHeight(), new Color(R, G, B, 255), true); Graphics2D g2d = (Graphics2D)g; g2d.setPaint(p); g2d.fillRect(0, 0, getWidth(), getHeight()); } } Assign ... Read More
Deadlock describes a situation where two or more threads are blocked forever, waiting for each other. Deadlock occurs when multiple threads need the same locks but obtain them in a different order. A Java multithreaded program may suffer from the deadlock condition because the synchronized keyword causes the executing thread to block while waiting for the lock, or monitor, associated with the specified object. Here is an example.ExampleLive Demopublic class TestThread { public static Object Lock1 = new Object(); public static Object Lock2 = new Object(); public static void main(String args[]) { ThreadDemo1 T1 = ... Read More
The SimpleDateFormat class has parse() method, which tries to parse a string according to the format stored in the given SimpleDateFormat object.ExampleLive Demoimport java.util.*; import java.text.*; public class DateDemo { public static void main(String args[]) { SimpleDateFormat ft = new SimpleDateFormat ("yyyy-MM-dd"); String input = args.length == 0 ? "1818-11-11" : args[0]; System.out.print(input + " Parses as "); Date t; try { t = ft.parse(input); System.out.println(t); } catch (ParseException e) { System.out.println("Unparseable using " + ft); } } }A sample run of the above program would produce the following result −Output1818-11-11 Parses as Wed Nov 11 00:00:00 EST 1818
Date and time formatting can be done very easily using the printf method. You use a two-letter format, starting with t and ending in one of the letters of the table as shown in the following code.ExampleLive Demoimport java.util.Date; public class DateDemo { public static void main(String args[]) { // Instantiate a Date object Date date = new Date(); // display time and date String str = String.format("Current Date/Time : %tc", date ); System.out.printf(str); } }This will produce the following ... Read More
An Object relational model is a combination of a Object oriented database model and a Relational database model. So, it supports objects, classes, inheritance etc. just like Object Oriented models and has support for data types, tabular structures etc. like Relational data model.One of the major goals of Object relational data model is to close the gap between relational databases and the object oriented practises frequently used in many programming languages such as C++, C#, Java etc.History of Object Relational Data ModelBoth Relational data models and Object oriented data models are very useful. But it was felt that they both ... Read More
If the remainder of the number when it is divided by 2 is 0, then it would be divisible by 2.Let’s say our number is 5, we will check it using the following if-else −// checking if the number is divisible by 2 or not if (num % 2 == 0) { Console.WriteLine("Divisible by 2 "); } else { Console.WriteLine("Not divisible by 2"); }ExampleThe following is an example to find whether the number is divisible by 2 or not.Live Demousing System; using System.Collections.Generic; using System.Linq; using System.Text; namespace Demo { class MyApplication { static ... Read More
Let’s say we have set the number for which we will find the sum of digits −int val = 789; Console.WriteLine("Number:", val);The following will find the sum of digits by entering the number and checking it recursively −public int addFunc(int val) { if (val != 0) { return (val % 10 + addFunc(val / 10)); } else { return 0; } }ExampleThe following is our code to find the sum of digits of a number using Recursion in C#.Live Demousing System; using System.Collections.Generic; using System.Linq; using System.Text; namespace Demo { ... Read More
Common Language Runtime (CLR) manages the execution of .NET programs. The just-in-time compiler converts the compiled code into machine instructions. This is what the computer executes.The services provided by CLR include memory management, exception handling, type safety, etc.Let us see the features of Common Language Runtime (CLR) in C#:ComponentsComponents in other languages can be easily worked upon with CLR.ThreadingThe CLR provides support for threads to create multithreaded applications.Class Library SupportIt has built-in types and libraries for assemblies, threading, memory management, etc.DebuggingCLR makes code debugging easier.Garbage CollectionIt provides automatic garbage collection in C#.
To compare strings in C#, use the compare() method. It compares two strings and returns the following integer values −If str1 is less than str2, it returns -1. If str1 is equal to str2, it returns 0. If str1 is greater than str2, it returns 1.Set the two strings in the String.compare() method and compare them −string.Compare(string1, string2);ExampleYou can try to run the following code to compare two strings in C#.Live Demousing System; using System.Collections.Generic; using System.Linq; using System.Text; namespace Demo { class MyApplication { static void Main(string[] args) { ... Read More