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Programming Articles
Page 2504 of 2547
Iterate through KeyValue Tuple in Java
To iterate through the KeyValue tuple in Java, use the Iterable and loop it through using the for loop. Let us first see what we need to work with JavaTuples. To work with KeyValue class in JavaTuples, you need to import the following package:import org.javatuples.KeyValue;Note: Download JavaTuples Jar library to run JavaTuples program. If you are using Eclipse IDE, then Right Click Project → Properties → Java Build Path → Add External Jars and upload the downloaded JavaTuples jar file. Refer the below guide for all the steps to run JavaTuples:Steps: How to run JavaTuples program in EclipseThe following is ...
Read MoreHow to get days, months and years between two Java LocalDate?
Set the two Java dates:LocalDate date1 = LocalDate.of(2019, 3, 25); LocalDate date2 = LocalDate.of(2019, 4, 29);Now, get the difference between two dates with Period class between() method:Period p = Period.between(date1, date2);Now, get the years, month and days:p.getYears() p.getMonths() p.getDays()Exampleimport java.time.LocalDate; import java.time.Period; public class Demo { public static void main(String[] args) { LocalDate date1 = LocalDate.of(2019, 3, 25); LocalDate date2 = LocalDate.of(2019, 4, 29); System.out.println("Date 1 = "+date1); System.out.println("Date 2 = "+date2); Period p = Period.between(date1, date2); System.out.println("Period = "+p); ...
Read MoreWhat is difference between GET and POST method in HTTP protocol?
GET methodThe GET method sends the encoded user information appended to the page request. The page and the encoded information are separated by the ? character as follows −http://www.test.com/hello?key1=value1&key2=value2The GET method is the default method to pass information from the browser to the web server and it produces a long string that appears in your browser's Location:box. It is recommended that the GET method is better not used. if you have a password or other sensitive information to pass to the server.The GET method has size limitation: only 1024 characters can be in a request string.This information is passed using ...
Read MoreCan we have a switch statement in JSP for XPath expression?
The tag works like a Java switch statement. With this, you can choose between a number of alternatives. Where the switch statement has the case statements, the tag has the tags. In a similar way, a switch statement has the default clause to specify a default action and the tag has the tag as the default clause.AttributeThe tag does not have any attribute.The tag has one attributes which is listed below.The tag does not have any attribute.The tag has the following attributes −AttributeDescriptionRequiredDefaultselectCondition to evaluateYesNoneExample ...
Read MoreHow to check whether the given date represents weekend in Java
At first, display the current date:LocalDate date = LocalDate.now();Now, get the day of week from the above Date (current date):DayOfWeek day = DayOfWeek.of(date.get(ChronoField.DAY_OF_WEEK));On the basis of the above result, use SWITCH to check for the current day. If the day is SATURDAY/SUNDAY, then it’s Weekend.Exampleimport java.time.DayOfWeek; import java.time.temporal.ChronoField; import java.time.LocalDate; public class Demo { public static void main(String[] argv) { LocalDate date = LocalDate.now(); DayOfWeek day = DayOfWeek.of(date.get(ChronoField.DAY_OF_WEEK)); switch (day) { case SATURDAY: System.out.println("Weekend - Saturday"); ...
Read MoreHow to read form data using JSP?
JSP handles requests using getParameter() method to read simple parameters and getInputStream() method to read binary data stream coming from the client.Reading Form Data using JSPJSP handles form data parsing automatically using the following methods depending on the situation −getParameter(): You call request.getParameter() method to get the value of a form parameter.getParameterValues(): Call this method if the parameter appears more than once and returns multiple values, for example, checkbox.getParameterNames(): Call this method if you want a complete list of all parameters in the current request.getInputStream(): Call this method to read binary data stream coming from the client.
Read MoreIs it legal to recurse into main() in C++?
In C or C++, the main function is like other functions. So we can use the functionalities that are present in some other functions, also in the main function.In the following program, we will see how the main() is using recursively to print some numbers in reverse order.Example Code#include using namespace std; int main () { static int x = 10; cout
Read MoreHow to convert Long array list to long array in Java?
Firstly, declare a Long array list and add some elements to it:ArrayList < Long > arrList = new ArrayList < Long > (); arrList.add(100000 L); arrList.add(200000 L); arrList.add(300000 L); arrList.add(400000 L); arrList.add(500000 L);Now, set the same size for the newly created long array:final long[] arr = new long[arrList.size()]; int index = 0;Each and every element of the Long array list is assigned to the long array:for (final Long value : arrList) { arr[index++] = value; }Exampleimport java.util.ArrayList; public class Demo { public static void main(String[] args) { ArrayList
Read MoreRandom number generation in C++
Let us see how to generate random numbers using C++. Here we are generating a random number in range 0 to some value. (In this program the max value is 100).To perform this operation we are using the srand() function. This is in the C library. The function void srand(unsigned int seed) seeds the random number generator used by the function rand.The declaration of srand() is like below:void srand(unsigned int seed)It takes a parameter called seed. This is an integer value to be used as seed by the pseudo-random number generator algorithm. This function returns nothing.To get the number we ...
Read MoreJava Program to convert mathematical string to int
To evaluate mathematical string to int, use Nashorn JavaScript in Java i.e. scripting. Nashorn invoke dynamics feature, introduced in Java 7 to improve performance.For scripting, use the ScriptEngineManager class for the engine:ScriptEngineManager scriptEngineManager = new ScriptEngineManager(); ScriptEngine scriptEngine = scriptEngineManager.getEngineByName("nashorn");Now, use put() to set a key/value pair in the state of the ScriptEngine:scriptEngine.put("one", 10); scriptEngine.put("two", 50); scriptEngine.put("three", 40);Now, here is the mathematical string. Use eval to evaluate:String strExp = "(one + two - three) == 20"; Object evalExp = scriptEngine.eval(strExp);Exampleimport javax.script.ScriptEngine; import javax.script.ScriptEngineManager; import javax.script.ScriptException; public class Demo { public static void main(String[] args) { ScriptEngineManager ...
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