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Java Articles
Page 93 of 450
Add week to current date using Calendar.add() method in Java
Import the following package for Calendar class in Javaimport java.util.Calendar;Firstly, create a Calendar object and display the current date and timeCalendar calendar = Calendar.getInstance(); System.out.println("Current Date and Time = " + calendar.getTime());Now, let us increment the weeks using the calendar.add() method and Calendar.WEEK_OF_YEAR constant.calendar.add(Calendar.WEEK_OF_YEAR, 2);The following is an exampleExampleimport java.util.Calendar; public class Demo { public static void main(String[] args) { Calendar calendar = Calendar.getInstance(); System.out.println("Current Date = " + calendar.getTime()); // Adding 2 weeks calendar.add(Calendar.WEEK_OF_YEAR, 2); System.out.println("Updated Date = " + calendar.getTime()); } ...
Read MoreChecks if two calendar objects represent the same local time in Java
Use the == operator to compare two calendar objects.Let us first create the first calendar object and set date −Calendar date1 = Calendar.getInstance(); date1.set(Calendar.YEAR, 2040); date1.set(Calendar.MONTH, 10); date1.set(Calendar.DATE, 25); date1.set(Calendar.HOUR_OF_DAY, 11); date1.set(Calendar.MINUTE, 30); date1.set(Calendar.SECOND, 10);Now, the following is the second calendar object −Calendar date2 = Calendar.getInstance(); date2.set(Calendar.YEAR, 2040); date2.set(Calendar.MONTH, 10); date2.set(Calendar.DATE, 25); date2.set(Calendar.HOUR_OF_DAY, 11); date2.set(Calendar.MINUTE, 30); date2.set(Calendar.SECOND, 10);Let is now compare them using == and && operators −if(date1.get(Calendar.SECOND) == date2.get(Calendar.SECOND) && date1.get(Calendar.MINUTE) == date2.get(Calendar.MINUTE) && date1.get(Calendar.HOUR) == date2.get(Calendar.HOUR) && date1.get(Calendar.DAY_OF_YEAR) == date2.get(Calendar.DAY_OF_YEAR) && date1.get(Calendar.YEAR) == date2.get(Calendar.YEAR) ) { System.out.println("The local time for the calendar objects is same..."); } ...
Read MoreDays till End of Year in Java
To get the days until the end of the year, find the difference between the total days in the current year with the total number of passed.Firstly, calculate the day of the year.Calendar calOne = Calendar.getInstance(); int dayOfYear = calOne.get(Calendar.DAY_OF_YEAR);Now, calculate the total days in the current year 2018.int year = calOne.get(Calendar.YEAR); Calendar calTwo = new GregorianCalendar(year, 11, 31); int day = calTwo.get(Calendar.DAY_OF_YEAR); System.out.println("Days in current year: "+day);Find the difference and you will get the days until the end of the year.The following is the complete example.Exampleimport java.util.Calendar; import java.util.GregorianCalendar; public class Demo { public static void main(String args[]) ...
Read MoreConvert day of year to day of month in Java
Firstly, set the day of year using DAY_OF_YEAR constant.Calendar cal = Calendar.getInstance(); cal.set(Calendar.YEAR, 2018); cal.set(Calendar.DAY_OF_YEAR, 320);Now, get the day of month −int res = cal.get(Calendar.DAY_OF_MONTH);The following is an example −Exampleimport java.util.Calendar; public class Demo { public static void main(String[] args) { Calendar cal = Calendar.getInstance(); cal.set(Calendar.YEAR, 2018); cal.set(Calendar.DAY_OF_YEAR, 320); System.out.println("Date = " + cal.getTime()); int res = cal.get(Calendar.DAY_OF_MONTH); System.out.println("Day of month = " + res); } }OutputDate = Fri Nov 16 07:54:55 UTC 2018 Day of month = 16
Read MoreEnum for days of week in Java
To set enum for days of the week, set them as constantsenum Days { Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday }Now create objects and set the above constants −Days today = Days.Wednesday; Days holiday = Days.Sunday;The following is an example −Examplepublic class Demo { enum Days { Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday } public static void main(String[] args) { Days today = Days.Wednesday; Days holiday = Days.Sunday; System.out.println("Today = " + today); System.out.println(holiday+ " is holiday"); } }OutputToday = Wednesday Sunday is holiday
Read MoreJava Program to use == operator to compare enums
We can use the == operator to compare enums in Java.Let’s say we have the following enum.enum Devices { LAPTOP, MOBILE, TABLET; }Here are some of the objects and we have assigned some values as well −Devices d1, d2, d3; d1 = Devices.LAPTOP; d2 = Devices.LAPTOP; d3 = Devices.TABLET;Let us now see an example wherein we will compare them using == operator −Examplepublic class Demo { enum Devices { LAPTOP, MOBILE, TABLET; } public static void main(String[] args) { Devices d1, d2, d3; d1 = Devices.LAPTOP; ...
Read MoreCreate BigInteger via string in Java
BigInteger class is used for big integer calculations which are outside the limit of the primitive data types. It provides operations for modular arithmetic, GCD calculation, primality testing, prime generation, bit manipulation, and a few other miscellaneous operations.Firstly, set a string −String str = "268787878787687";Now, create a new object for BigInteger and pass the above string −BigInteger bInteger = new BigInteger(str);The following is an example −Exampleimport java.math.BigInteger; public class Demo { public static void main(String[] argv) throws Exception { String str = "268787878787687"; BigInteger bInteger = new BigInteger(str); System.out.println(bInteger); } }Output268787878787687
Read MoreCreate BigInteger via long type variable in Java
BigInteger class is used for big integer calculations which are outside the limit of the primitive data types. It provides operations for modular arithmetic, GCD calculation, primality testing, prime generation, bit manipulation, and a few other miscellaneous operations.Firstly, set a long value −Long l = 198L;Now, create a new object for BigInteger and pass the above value −BigInteger bInteger = new BigInteger(l);The following is an example −Exampleimport java.math.BigInteger; public class Demo { public static void main(String[] argv) throws Exception { Long l = 198L; BigInteger bInteger = BigInteger.valueOf(l); System.out.println(bInteger); } }Output198
Read MoreCreate BigInteger from byte array in Java
BigInteger class provides operations for modular arithmetic, GCD calculation, primality testing, prime generation, bit manipulation, and a few other miscellaneous operations.Let’s say the following is our byte array −byte[] arr = new byte[] { 0x1, 0x00, 0x00 };We will now convert them to BigInteger −BigInteger bInteger = new BigInteger(arr);The following is an example that creates BigInteger from a byte array in Java.Exampleimport java.math.BigInteger; public class Demo { public static void main(String[] argv) throws Exception { byte[] arr = new byte[] { 0x1, 0x00, 0x00 }; BigInteger bInteger = new BigInteger(arr); System.out.println(bInteger); } }Output65536
Read MoreNegate a BigInteger in Java
Use the BigInteger negate() method in Java to negate a BigInteger.First, let us create an object −BigInteger one, two; one = new BigInteger("200");Negate the above and assign it to the second object −two = one.negate();The following is an example −Exampleimport java.math.*; public class BigIntegerDemo { public static void main(String[] args) { BigInteger one, two; one = new BigInteger("200"); System.out.println("Actual Value: " +one); // negate two = one.negate(); System.out.println("Negated Value: " +two); } }OutputActual Value: 200 Negated Value: -200
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