Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
-
Economics & Finance
Programming Articles
Page 1571 of 2547
Check for the availability of a package in Java
The availability can be checked using the method java.lang.Class.forName(). The class object associated with the class with the given string name can be returned using the method java.lang.Class.forName(String name, boolean initialize, ClassLoader loader), using the class loader that is used to load the class.A program that demonstrates this is given as follows −Examplepublic class Main { public static void main(String args[]) { System.out.println(Availability("java.lang.String")); } public static boolean Availability(String name) { boolean flag = false; try { Class.forName(name, false, null); flag ...
Read MoreGet the unqualified name of a class in Java
A qualified class name in Java contains the package that the class originated from. In contrast to this, the unqualified class name contains only the class name without any package information. A program that gets the unqualified name of a class is given as follows:Examplepublic class Demo { public static void main(String[] argv) throws Exception { Class c = java.util.ArrayList.class; String className = c.getName(); System.out.println("The qualified class name is: " + className); if (className.lastIndexOf('.') < 0) { className = className.substring(className.lastIndexOf('.') + 1); ...
Read MoreGet the fully-qualified name of a class in Java
A fully-qualified class name in Java contains the package that the class originated from. An example of this is java.util.ArrayList. The fully-qualified class name can be obtained using the getName() method.A program that demonstrates this is given as follows −Examplepublic class Demo { public static void main(String[] argv) throws Exception { Class c = java.util.ArrayList.class; String className = c.getName(); System.out.println("The fully-qualified name of the class is: " + className); } }OutputThe fully-qualified name of the class is: java.util.ArrayListNow let us understand the above program.The getName() method is used to ...
Read MoreSubtract minutes from current time using Calendar.add() method in Java
Import the following package for Calendar class in Java.import java.util.Calendar;Firstly, create a Calendar object and display the current date and time.Calendar calendar = Calendar.getInstance(); System.out.println("Current Date and Time = " + calendar.getTime());Now, let us decrement the minutes using the calendar.add() method and Calendar.MINUTE constant. Set a negative value since you want to decrease the minutes.calendar.add(Calendar.MINUTE, -15);Exampleimport java.util.Calendar; public class Demo { public static void main(String[] args) { Calendar calendar = Calendar.getInstance(); System.out.println("Current Date = " + calendar.getTime()); // Subtract 15 minutes from current date calendar.add(Calendar.MINUTE, -15); ...
Read MoreUsing reflection to check array type and length in Java
The array type can be checked using the java.lang.Class.getComponentType() method. This method returns the class that represents the component type of the array. The array length can be obtained in int form using the method java.lang.reflect.Array.getLength().A program that demonstrates this is given as follows −Exampleimport java.lang.reflect.Array; public class Demo { public static void main (String args[]) { int[] arr = {6, 1, 9, 3, 7}; Class c = arr.getClass(); if (c.isArray()) { Class arrayType = c.getComponentType(); System.out.println("The array is of type: " ...
Read MoreDisplay Date Time in dd MMM yyyy hh:mm:ss zzz format in Java
Firstly, import the following Java packagesimport java.text.SimpleDateFormat; import java.util.Date;Now, create objectsDate dt = new Date(); SimpleDateFormat dateFormat;Displaying date in the format we want −dateFormat = new SimpleDateFormat("dd MMM yyyy hh:mm:ss zzz");The following is an example −Exampleimport java.text.SimpleDateFormat; import java.util.Date; public class Demo { public static void main(String args[]) { Date dt = new Date(); SimpleDateFormat dateFormat; dateFormat = new SimpleDateFormat("dd MMM yyyy hh:mm:ss zzz"); System.out.println("Date: "+dateFormat.format(dt)); } }OutputDate: 22 Nov 2018 07:53:58 UTC
Read MoreC++ Program to Compute Combinations using Factorials
The following is an example to compute combinations using factorials.Example#include using namespace std; int fact(int n) { if (n == 0 || n == 1) return 1; else return n * fact(n - 1); } int main() { int n, r, result; coutn; coutr; result = fact(n) / (fact(r) * fact(n-r)); cout
Read MoreSet a duration in Java
To set a duration, let us declare two objects of Calendar classCalendar c1 = Calendar.getInstance(); Calendar c2 = Calendar.getInstance();Set a time for one of the calendar objectsc2.add(Calendar.HOUR, 9); c2.add(Calendar.MINUTE, 15); c2.add(Calendar.SECOND, 40);Now, find the difference between both the time. One would be the current time and another we declared above −long calcSeconds = (c2.getTimeInMillis() - c1.getTimeInMillis()) / 1000;The following is an example −Exampleimport java.util.Calendar; public class Demo { public static void main(String args[]) { Calendar c1 = Calendar.getInstance(); Calendar c2 = Calendar.getInstance(); // set hour, minute and second c2.add(Calendar.HOUR, 9); ...
Read MoreAdd seconds to current date using Calendar.add() method in Java
Import the following package for Calendar class in Java.import java.util.Calendar;Firstly, create a Calendar object and display the current date and time.Calendar calendar = Calendar.getInstance(); System.out.println("Current Date and Time = " + calendar.getTime());Now, let us increment the seconds using the calendar.add() method and Calendar.SECOND constant.calendar.add(Calendar.SECOND, 15);Exampleimport java.util.Calendar; public class Demo { public static void main(String[] args) { Calendar calendar = Calendar.getInstance(); System.out.println("Current Date = " + calendar.getTime()); // Add 15 seconds to current date calendar.add(Calendar.SECOND, 15); System.out.println("Updated Date = " + calendar.getTime()); } }OutputCurrent ...
Read MoreList the Interfaces That a Class Implements in Java
The interfaces that are implemented by a class that is represented by an object can be determined using the java.lang.Class.getInterfaces() method. This method returns an array of all the interfaces that are implemented by the class.A program that demonstrates this is given as follows −Examplepackage Test; import java.lang.*; import java.util.*; public class Demo { public static void main(String[] args) { listInterfaces(String.class); } public static void listInterfaces(Class c) { System.out.println("The Class is: " + c.getName()); Class[] interfaces = c.getInterfaces(); System.out.println("The Interfaces are: " + Arrays.asList(interfaces)); ...
Read More