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Programming Articles
Page 1565 of 2547
Concatenate null to a string in Java
To concatenate null to a string, use the + operator.Let’s say the following is our string.String str = "Demo Text";We will now see how to effortlessly concatenate null to string.String strNULL = str + "null";The following is the final example.Examplepublic class Demo { public static void main(String[] args) { String str = "Demo Text"; System.out.println("String = "+str); String strNULL = str + "null"; System.out.println("String concatenated with NULL: "+strNULL); } }OutputString = Demo Text String concatenated with NULL: Demo Textnull
Read MoreGet localized day name in Java
The following is an example.Exampleimport java.util.Date; import java.text.DateFormat; import java.text.SimpleDateFormat; public class Demo { public static void main(String[] args) throws Exception { Date d = new Date(); DateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy hh:mm:ss a"); String format = dateFormat.format(d); System.out.println("Current date and time = " + format); System.out.printf("Localized day name = %tA/%TA", d, d); } }OutputCurrent date and time = 26/11/2018 11:44:44 AM Localized day name = Monday/MONDAY
Read MoreC++ Program to Find the Number of Vowels, Consonants, Digits and White Spaces in a String
A string is a one dimensional character array that is terminated by a null character. There can be many vowels, consonants, digits and white spaces in a string.For example.String: There are 7 colours in the rainbow Vowels: 12 Consonants: 15 Digits: 1 White spaces: 6A program to find the number of vowels, consonants, digits and white spaces in a string is given as follows.Example#include using namespace std; int main() { char str[] = {"Abracadabra 123"}; int vowels, consonants, digits, spaces; vowels = consonants = digits = spaces = 0; for(int i = 0; str[i]!='\0'; ++i) ...
Read MoreParse and format a number to decimal in Java
To parse and format a number to decimal, try the following code.Examplepublic class Demo { public static void main( String args[] ) { int val = Integer.parseInt("5"); String str = Integer.toString(val); System.out.println(str); } }Output5In the above program, we have used the Integer.parseInt() and Integer.toString() method to convert a number to decimal.int val = Integer.parseInt("5"); String str = Integer.toString(val);The toString() method above represents a value in string and formats.
Read MoreGet Java Home Directory
Use the System.getProperty() method in Java to get the Java Home Directory.It’s syntax is −String getProperty(String key)Above, the key is the name of the system property. Since, we want the Java Home Directory name, therefore we will add the key as −java.homeThe following is an example −Examplepublic class Demo { public static void main(String[] args) { System.out.println("Get Java Home Directory = " + System.getProperty("java.home")); System.out.print("Java Specification Version: "); System.out.println(System.getProperty("java.specification.version")); System.out.print("java Runtime Environment (JRE) ...
Read MoreGet localized short day-in-week name in Java
Use the ‘a’ date conversion character to display short day-in-week.System.out.printf("Localized short day name = %ta/%Ta", d, d);Above, d is a date object −Date d = new Date();The following is an example −Exampleimport java.util.Date; import java.text.DateFormat; import java.text.SimpleDateFormat; public class Demo { public static void main(String[] args) throws Exception { Date d = new Date(); DateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy hh:mm:ss a"); String format = dateFormat.format(d); System.out.println("Current date and time = " + format); ...
Read MoreParse and format to hexadecimal in Java
To parse and format to hexadecimal in Java, we have used the BigInteger class. The java.math.BigInteger class provides operations analogues to all of Java's primitive integer operators and for all relevant methods from java.lang.Math.In the below example, we have taken BigInteger and created an object. With that, some values have been set by us in the arguments as the hexadecimal and the radix i.e. 16 for hexadecimal.BigInteger bi = new BigInteger("2ef", 16);Let us see an example.Exampleimport java.math.*; public class Demo { public static void main( String args[] ) { BigInteger bi = new BigInteger("2ef", 16); ...
Read MoreDifferent ways to format long with Java System.out.format
The System.out.format is used in Java to format output. Here, let’s say the following is our long. long val = 787890; To format, we have considered the following that justifies the output. System.out.format("%d%n", val); System.out.format("%9d%n", val); System.out.format("%+9d%n", val); System.out.format("%08d%n", val); System.out.format("%, 9d%n", val); The following is the complete example that displays the difference in output as well. Example import java.util.Locale; public class Demo { public static void main(String []args) { long val = 787890; System.out.format("%d%n", val); ...
Read MoreJava Program to return a Date set to the last possible millisecond of the month before midnight
Use the getMaximum() method in Java to returns the maximum value for the given calendar field. We will use it to set the minute, second and millisecond.Let us first declare a calendar object −Calendar dateNoon = Calendar.getInstance();Now, we will set the hour, minute, second and millisecond to the last possible millisecond on the month before midnight.// hour, minute and second calendar.set(Calendar.HOUR_OF_DAY, calendar.getMaximum(Calendar.HOUR_OF_DAY)); calendar.set(Calendar.MINUTE, calendar.getMaximum(Calendar.MINUTE)); calendar.set(Calendar.SECOND, calendar.getMaximum(Calendar.SECOND)); // millisecond calendar.set(Calendar.MILLISECOND, calendar.getMaximum(Calendar.MILLISECOND));Now, do the following for month and day of month −calendar.set(Calendar.DAY_OF_MONTH, 1); // first day of month calendar.add(Calendar.MONTH, 1); calendar.add(Calendar.DAY_OF_MONTH, -1);The following is an example to return a Date set to ...
Read MorePass an integer by reference in Java
To pass an integer by reference in Java, try the following code −Examplepublic class Demo { public static void display(int[] arr) { arr[0] = arr[0] + 50;; } public static void main(String[] args) { int val = 50; int[] myArr = { val }; display(myArr); System.out.println(myArr[0]); } }Output100In the above program, a custom method is created, which pass an int array.int val = 50; int[] myArr = { val }; display(myArr);In the method, we have performed mathematical operation on the value of array.public static void display(int[] arr) { arr[0] = arr[0] + 50;; }The updated value is then displayed in the main.System.out.println(myArr[0]);
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