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Articles by karthikeya Boyini
Page 78 of 142
How to display Java Runtime Environment (JRE) version
Use the System.getProperty() method in Java to get the Java Runtime Environment.It’s syntax is −String getProperty(String key)Above, the key is the name of the system property. Since, we want the Java Runtime Environment name, therefore we will add the key as −java.versionThe following is an example −Examplepublic class Demo { public static void main(String[] args) { System.out.print("Java Specification Version: "); System.out.println(System.getProperty("java.specification.version")); System.out.print("java Runtime Environment (JRE) version: "); System.out.println(System.getProperty("java.version")); } }OutputJava Specification Version: 1.8 java Runtime Environment (JRE) version: 1.8.0_141
Read MoreParse string date value input in Java
UseSimpleDateFormat('dd-MMM-yy') for string date.Format dateFormatter = new SimpleDateFormat("dd-MMM-yy");For above class, do not forget to import the following package, else an error would be visible.import java.text.SimpleDateFormat;Now, parse the date.Date dt = (Date) dateFormatter.parseObject("20-Nov-18");Exampleimport java.text.Format; import java.text.SimpleDateFormat; import java.util.Date; public class Main { public static void main(String[] argv) throws Exception { Format dateFormatter = new SimpleDateFormat("dd-MMM-yy"); // parse Date dt = (Date) dateFormatter.parseObject("20-Nov-18"); System.out.println("Date = "+dt); } }OutputDate = Tue Nov 20 00:00:00 UTC 2018
Read MoreDisplay path separator in Java
To display the path separator, use the Properties class and import the following package −import java.util.Properties;Use the getProperties() method first and create an object −Properties p = System.getProperties();Now, set the key for path separator −p.getProperty("path.separator")The following is an example −Exampleimport java.util.Properties; public class Demo { public static void main(String[] args) { Properties p = System.getProperties(); System.out.println("Separator is "+p.getProperty("path.separator")); } }OutputSeparator is :
Read MoreSet width and precision to format output in Java
Set width in output as shown below. Here, %10 sets a 10 character fieldSystem.out.printf("d1 = %10.2f d2 = %8g", d1, d2);Above, the value after the decimal is for decimal places i.e. 5.3 is for 3 decimal places −System.out.printf("d1 = %5.3f d2 = %2.5f", d1, d2);The following is an example −Examplepublic class Demo { public static void main(String[] args) throws Exception { double d1 = 399.8877; double d2 = 298.87690; System.out.printf("d1 = %10.2f d2 = %8g", d1, d2); System.out.printf("d1 = %5.3f d2 = %2.5f", d1, d2); } }Outputd1 = 399.89 d2 = 298.877 d1 = 399.888 d2 = 298.87690
Read MoreConcatenate 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 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 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 ...
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