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Programming Articles
Page 1563 of 2547
Set a GregorianCalendar object to a particular date in Java
To work with the GregorianCalendar class, import the following package.import java.util.GregorianCalendar;Firstly, create a GregorianCalendar object.GregorianCalendar calendar = new GregorianCalendar();Now, set the above-created object to a date. Here 0 is for 1st month.calendar.set(2018, 0, 25);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 calendar = new GregorianCalendar(); // 0 is for 1st month calendar.set(2018, 0, 25); System.out.println("" + calendar.getTime()); } }OutputThu Jan 25 16:51:24 UTC 2018
Read MoreDisplay TimeZone in zzzz format in Java
Use the zzzz format like this for TimeZone.SimpleDateFormat("zzzz");Let us see an example −// displaying timezone in zzzz format simpleformat = new SimpleDateFormat("zzzz"); String strTimeZone = simpleformat.format(new Date()); System.out.println("TimeZone in zzzz format = "+strTimeZone);Above, we have used the SimpleDateFormat class, therefore the following package is imported −import java.text.SimpleDateFormat;The following is an example −Exampleimport java.text.Format; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Calendar; public class Demo { public static void main(String[] args) throws Exception { // displaying current date and time Calendar cal = Calendar.getInstance(); ...
Read MoreGet number of available processors in Java
In order to get the number of available processors in Java, we use the availableProcessors() method. The java.lang.Runtime.availableProcessors() method returns the number of processors which are available to the Java virtual machine. This number may vary during a particular call of the virtual machine.Declaration − The java.lang.Runtime.availableProcessors() method is declared as follows −public int availableProcessors()Let us see a program to get the number of available processors in Java −Examplepublic class Example { public static void main(String[] args) { // print statement at the start of the program System.out.println("Start..."); System.out.print("Number of ...
Read MoreJava Program to get the day of the week from GregorianCalendar
For GregorianCalendar class, import the following package.import java.util.GregorianCalendar;Create an object.GregorianCalendar calendar = new GregorianCalendar();To get the day of the week, use the following field.GregorianCalendar.DAY_OF_WEEKThe following is an example.Exampleimport java.util.Calendar; import java.util.GregorianCalendar; public class Demo { public static void main(String[] a) { GregorianCalendar calendar = new GregorianCalendar(); System.out.println("Day of Week = " + calendar.get(GregorianCalendar.DAY_OF_WEEK)); System.out.println("Date = " + calendar.get(GregorianCalendar.DATE)); System.out.println("Month = " + calendar.get(GregorianCalendar.MONTH)); System.out.println("Year = " + calendar.get(GregorianCalendar.YEAR)); } }OutputDay of Week = 2 Date = 19 Month = 10 Year = 2018
Read MoreGenerate Random Integer Numbers in Java
In order to generate Random Integer Numbers in Java, we use the nextInt() method of the java.util.Random class. This returns the next random integer value from this random number generator sequence.Declaration − The java.util.Random.nextInt() method is declared as follows −public int nextInt()Let us see a program to generate random integer numbers in Java −Exampleimport java.util.Random; public class Example { public static void main(String[] args) { Random rd = new Random(); // creating Random object System.out.println(rd.nextInt()); } }Output27100093Note - The output might vary on Online Compilers.
Read MoreGenerate Random bytes in Java
In order to generate random bytes in Java, we use the nextBytes() method. The java.util.Random.nextBytes() method generates random bytes and provides it to the user defined byte array.Declaration − The java.util.Random.nextBytes() method is declared as follows −public void nextBytes(byte[] bytes)where bytes is the byte array.Let us see a program to generate random bytes in Java −Exampleimport java.util.Random; public class Example { public static void main(String[] args) { Random rd = new Random(); byte[] arr = new byte[7]; rd.nextBytes(arr); System.out.println(arr); } }Output[B@15db9742Note − The output might vary ...
Read MoreExtracting MAC address using Python
We know that the MAC address is a hardware address which means it is unique for the network card installed on our PC. It is always unique that means no two devices on a local network could have the same MAC addresses. The main purpose of MAC address is to provide a unique hardware address or physical address for every node on a local area network (LAN) or other networks. A node means a point at which a computer or other device (e.g. a printer or router) will remain connected to the network. Method1 Using uuid.getnode() In this example getnode() ...
Read MoreJava Program to concatenate a String and Integers
To concatenate a String and some integer values, you need to use the + operator. Let’s say the following is the string. String str = "Demo Text"; Now, we will concatenate integer values. String res = str + 1 + 2 + 3 + 4 + 5; The following is the final example. Example public class Demo { public static void main(String[] args) { String str = "Demo Text"; System.out.println("String = "+str); String res = str + 1 + 2 + 3 + 4 + 5; System.out.println(res); } } Output String = Demo Text Demo Text12345
Read MoreModify Date and Time from GregorianCalendar in Java
For GregorianCalendar class, import the following package.import java.util.GregorianCalendar;Firstly, let us display the current date and time.GregorianCalendar cal = (GregorianCalendar) GregorianCalendar.getInstance(); System.out.println("Current date: " + cal.getTime());Now, modify the date. Here we are adding two days to the month using the add() method.cal.add((GregorianCalendar.MONTH), 2);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()); cal.add((GregorianCalendar.MONTH), 2); System.out.println("Modified date: " + cal.getTime()); } }OutputCurrent date: Mon Nov 19 17:52:55 UTC 2018 Modified date: Sat Jan 19 ...
Read MoreJava Program to display previous year from GregorianCalendar
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 year.cal.add((GregorianCalendar.YEAR), -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()); // previous year cal.add((GregorianCalendar.YEAR), -1); System.out.println("Modified date: " + cal.getTime()); } }OutputCurrent date: Mon Nov 19 18:05:49 UTC 2018 Modified date: Sun Nov 19 18:05:49 UTC 2017
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