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Articles by karthikeya Boyini
Page 82 of 142
Java Program to decrement a Date using the Calendar Class
Import the following package for Calendar class in Javaimport java.util.Calendar;Firstly, create a Calendar object and display the current dateCalendar calendar = Calendar.getInstance(); System.out.println("Current Date = " + calendar.getTime());Now, let us decrement the date using the add() method and Calendar.DATE constant. Set a negative value since we are decrementing the datecalendar.add(Calendar.DATE, -3);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()); // Decrementing date by 3 calendar.add(Calendar.DATE, -3); System.out.println("Updated ...
Read MoreReverse words in a given String in Java
The order of the words in a string can be reversed and the string displayed with the words in reverse order. An example of this is given as follows.String = I love mangoes Reversed string = mangoes love IA program that demonstrates this is given as follows.Exampleimport java.util.regex.Pattern; public class Example { public static void main(String[] args) { String str = "the sky is blue"; Pattern p = Pattern.compile("\s"); System.out.println("The original string is: " + str); String[] temp = p.split(str); String rev = ""; ...
Read MoreDecrement a Month using the Calendar Class in Java
Import the following package for Calendar class in Javaimport java.util.Calendar;Firstly, create a Calendar object and display the current dateCalendar calendar = Calendar.getInstance(); System.out.println("Current Date = " + calendar.getTime());Now, let us decrement the month using the add() method and Calendar.MONTH constant. Set a negative value here since we are decrementingcalendar.add(Calendar.MONTH, -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()); // Decrementing Month by 2 calendar.add(Calendar.MONTH, -2); System.out.println("Updated Date ...
Read MoreSort the words in lexicographical order in Java
The words are sorted in lexicographical order or dictionary order. This means that the words are alphabetically ordered based on their component alphabets. An example of this is given as follows.The original order of the words is Tom Anne Sally John The lexicographical order of the words is Anne John Sally TomA program that demonstrates this is given as follows.Examplepublic class Example { public static void main(String[] args) { String[] words = { "Peach", "Orange", "Mango", "Cherry", "Apple" }; int n = 5; System.out.println("The original order of the words is: ...
Read MoreSubtract seconds from current time 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 decrement the seconds using the calendar.add() method and Calendar.SECOND constant. Set a negative value since we are decrementingcalendar.add(Calendar.SECOND, -20);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()); // Subtract 20 seconds from current date calendar.add(Calendar.SECOND, -20); ...
Read MoreUnix date format in Java
Use the ‘c’ date conversion character to display UNIX date format in Java.System.out.printf("Unix date format: %tc",d);Above, d is a date object.Date d = new Date();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(); System.out.printf("Unix date format: %tc",d); System.out.printf("Unix date format: %Tc",d); } }OutputUnix date format: Mon Nov 26 12:24:10 UTC 2018 Unix date format: MON NOV 26 12:24:10 UTC 2018
Read MoreDisplay numbers with thousands separator in Java
To display number with thousands separator, set a comma flag.System.out.printf( "%,d",78567);The above would result.78, 567Let’s check for bigger numbers.System.out.printf( "%,d", 463758);The above would result.463,758Examplepublic class Demo { public static void main( String args[] ) { System.out.printf( "%,d", 95647 ); System.out.printf( "%,d", 687467 ); System.out.printf( "%,.2f", 7546.21 ); System.out.printf( "%,.2f", 463758.787 ); System.out.printf( "%,.2f", 123456.5 ); } }Output95,647 687,467 7,546.21 463,758.79 123,456.50
Read MoreLocale-specific morning/afternoon indicator in Java
Locale-specific morning/afternoon indicator is the AM/PM marker indicator.Use the ‘p’ conversion character to display AM/PM.System.out.printf("Morning/afternoon indicator: %tp",d);Exampleimport java.util.Date; public class Demo { public static void main(String[] args) { Date d = new Date(); System.out.printf("Morning/afternoon indicator: %tp",d); System.out.printf("Morning/afternoon indicator: %Tp",d); } }OutputMorning/afternoon indicator: pm Morning/afternoon indicator: PM
Read MorePermutation and Combination in Java
Permutation and Combination are a part of Combinatorics. Permutation is the different arrangements that a set of elements can make if the elements are taken one at a time, some at a time or all at a time. Combination is is the different ways of selecting elements if the elements are taken one at a time, some at a time or all at a time.An example of this is given as follows −Permutation = factorial(n) / factorial(n-r); Combination = factorial(n) / (factorial(r) * factorial(n-r)); n = 5 r = 3 Permutation = 60 Combination = 10A program that demonstrates this ...
Read MoreArgument Index in Java
Argument indices allow programmers to reorder the output. Let us see an example.Examplepublic class Demo { public static void main(String[] args) { System.out.printf("Before reordering = %s %s %s %s %s %s", "one", "two", "three", "four", "five", "six" ); System.out.printf("After reordering = %6$s %5$s %4$s %3$s %2$s %1$s", "one", "two", "three", "four", "five", "six" ); System.out.printf("Before reordering = %d %d %d", 100, 200, 300); System.out.printf("After reordering = %2$d %3$d %1$d", 100, 200, 300); } }OutputBefore reordering = one two three four five six After reordering = six ...
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