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Articles on Trending Technologies
Technical articles with clear explanations and examples
Declare static variables and methods in an abstract class in Java
If a method is declared as static, it is a member of a class rather than belonging to the object of the class. It can be called without creating an object of the class. A static method also has the power to access static data members of the class.A static variable is a class variable. A single copy of the static variable is created for all instances of the class. It can be directly accessed in a static method.An abstract class in Java is a class that cannot be instantiated. It is mostly used as the base for subclasses to ...
Read MoreSchedule a task for repeated fixed delay execution in Java
In fixed-delay execution, each execution is scheduled with respect to the original execution time of the preceding execution. If an execution is delayed for a particular reason (case in point, garbage collection), the subsequent executions will be delayed as well.There are two ways in which a task can be scheduled for repeated fixed-delay execution. They are as follows −Scheduling a task for repeated fixed-delay execution at a specified timeScheduling a task for repeated fixed-delay execution after a specified delayScheduling a task for repeated fixed-delay execution at a specified timeThe void schedule(TimerTask task, Date firstTime, long period) method schedules tasks for ...
Read MoreHow to throw a C++ exception?
Exception handling is used to handle the exceptions. We can use try catch block to protect the code. Exception can be thrown anywhere within the code block. The keyword “throw” is used to throw an exception.Here is an example of throw in C++ language,Example#include using namespace std; int display(int x, int y) { if( y == 0 ) { throw "Division by zero condition!"; } return (x/y); } int main () { int a = 50; int b = 0; int c = 0; try { c = display(a, b); cout
Read MoreHow to return local array from a C++ function?
A local array cannot be directly returned from a C++ function as it may not exist in memory after the function call. A way to resolve this is to use a static array in the function. As the lifetime of the static array is the whole program, it can easily be returned from a C++ function without the above problem.A program that demonstrates this is given as follows.Example#include using namespace std; int *retArray() { static int arr[10]; for(int i = 0; i
Read MoreCan we override a private or static method in Java
No, we cannot override private or static methods in Java.Private methods in Java are not visible to any other class which limits their scope to the class in which they are declared.ExampleLet us see what happens when we try to override a private method −class Parent { private void display() { System.out.println("Super class"); } } public class Example extends Parent { void display() // trying to override display() { System.out.println("Sub class"); } public static void main(String[] args) { Parent obj = new Example(); ...
Read MoreCancel the Timer Task in Java
In order to cancel the Timer Task in Java, we use the java.util.TimerTask.cancel() method. The cancel() method returns a boolean value, either true or false. The cancel() method is used to cancel the timer task.Declaration −The java.util.TimerTask.cancel() method is declared as follows −public boolean cancel()The cancel() methods returns true when the task is scheduled for one-time execution and has not executed until now and returns false when the task was scheduled for one-time execution and has been executed already.Let us see a program to illustrate the use of the java.util.TimerTask.cancel() method −Exampleimport java.util.*; class MyTask extends TimerTask { public ...
Read MoreInitializing array with variable vs a real number in C++
An array is a collection of same type of elements at contiguous memory location. The lowest address in the array corresponds to the first element while highest address corresponds to the last element. The array index starts with zero(0) and ends with the size of array minus one(array size - 1).An array can be initialized with variables as well as real numbers. A program that demonstrates this is given as follows.Example#include using namespace std; int main() { int a = 5; int b = 3; int arr[4]; arr[0] = a; arr[1] = 8; arr[2] = b; arr[3] = 2; cout
Read MoreJava Program to display previous day from GregorianCalender
For GregorianCalendar class, import the following package.import java.util.GregorianCalendar;Create an object.GregorianCalendar cal = (GregorianCalendar) GregorianCalendar.getInstance();Now, use the following field and add() method with a negative one (-1) to display the previous day.cal.add((GregorianCalendar.DATE), -1)Exampleimport java.util.Calendar; import java.util.GregorianCalendar; public class Demo { public static void main(String[] a) { GregorianCalendar cal = (GregorianCalendar) GregorianCalendar.getInstance(); System.out.println("Current date: " + cal.getTime()); // past date cal.add((GregorianCalendar.DATE), -1); System.out.println("Modified date (Previous Day): " + cal.getTime()); } }OutputCurrent date: Mon Nov 19 18:12:53 UTC 2018 Modified date (Previous Day): Sun Nov 18 18:12:53 UTC 2018
Read MoreParse and format to arbitrary radix <= Character.MAX_RADIX in Java
Let us set a radix here as.// radix int r = 32;Include the radix here as a BigInteger constructor.BigInteger one = new BigInteger("vv", r);Now get its string representation −String strResult = one.toString(radix);The following is an example −Exampleimport java.math.*; public class Demo { public static void main(String[] args) { // radix int r = 32; BigInteger one = new BigInteger("vv", r); String strResult = one.toString(r); System.out.println(strResult); } }Outputvv
Read MoreDetermine day of week in month from Gregorian Calendar in Java
To work with the GregorianCalendar class, import the following package −import java.util.GregorianCalendar;To get the day of week in month, use the following field −cal.get(Calendar.DAY_OF_WEEK_IN_MONTH)Above, cal is the GregorianCalendar object we created before −GregorianCalendar cal = new GregorianCalendar();The following is an example −Exampleimport java.util.GregorianCalendar; import java.util.Calendar; import java.util.Date; public class Demo { public static void main(String[] args) { GregorianCalendar cal = new GregorianCalendar(); // date information System.out.println("Date Information.........."); System.out.println("Year = " + cal.get(Calendar.YEAR)); System.out.println("Month = " + (cal.get(Calendar.MONTH) + 1)); System.out.println("Date = ...
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