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Articles by Samual Sam
Page 71 of 151
Java Program to generate random elements from a given array
Let’s say the following is our array −Integer[] arr = {2, 4, 6, 8, 10, 12, 14, 16, 18, 20};Now, we can convert it to a list before shuffling it −Listlist = Arrays.asList(arr); Collections.shuffle(list);The above shuffling generates random elements. Display them like this −for (Integer res: list) { System.out.print(res + " "); }Exampleimport java.util.Arrays; import java.util.Collections; import java.util.List; public class Demo { public static void main(String[] args) { Integer[] arr = {2, 4, 6, 8, 10, 12, 14, 16, 18, 20}; System.out.print("Array elements..."); for (Integer res: arr) { ...
Read MoreJava Program to convert java.util.Date to LocalDate
At first set the date with java.util.Date −java.util.Date date = new Date();Now, convert the date to LocalDate −Instant instant = Instant.ofEpochMilli(date.getTime()); System.out.println("LocalDate = "+LocalDateTime.ofInstant(instant, ZoneId.systemDefault()).toLocalDate());Exampleimport java.time.Instant; import java.time.LocalDateTime; import java.time.ZoneId; import java.util.Date; public class Demo { public static void main(String[] args) { java.util.Date date = new Date(); System.out.println("Date = "+date); Instant instant = Instant.ofEpochMilli(date.getTime()); System.out.println("LocalDate = "+LocalDateTime.ofInstant(instant, ZoneId.systemDefault()).toLocalDate()); } }OutputDate = Thu Apr 18 23:51:06 IST 2019 LocalDate = 2019-04-18
Read MoreDisplaying at most 10 characters in a string in Java
To display at most 10 characters in a string, work with the Formatter class.Import the following package for Formatter class in Java −import java.util.Formatter;Create a new Formatter object −Formatter f = new Formatter();Let us now display at most 10 characters in a string −f = new Formatter(); System.out.println("Displaying at most 10 characters: "+f.format("%.10s", "This is demo text!"));The following is an example −Exampleimport java.util.Formatter; public class Demo { public static void main(String args[]) { Formatter f = new Formatter(); String str = "This is demo text!"; ...
Read MoreShift right in a BigInteger in Java
To shift right in a BigInteger, use the shiftRight() method.The java.math.BigInteger.shiftRight(int n) returns a BigInteger whose value is (this >> n). Sign extension is performed. The shift distance, n, may be negative, in which case this method performs a left shift. It computes floor(this / 2n).The following is an example −Exampleimport java.math.*; public class Demo { public static void main(String[] args) { BigInteger one; one = new BigInteger("25"); one = one.shiftRight(3); System.out.println("Result: " +one); } }OutputResult: 3
Read MoreGet the JVM uptime from RuntimeMXBean in Java
RuntimeMXBean in the management interface for the runtime system of the Java virtual machine −RuntimeMXBean runtimeMX = ManagementFactory.getRuntimeMXBean();Let us get the JVM uptime using the getUptime() method −runtimeMX.getUptime()The following is an example −Exampleimport java.lang.management.ManagementFactory; import java.lang.management.RuntimeMXBean; import java.util.Date; public class Demo { public static void main(String args[]) throws Exception { RuntimeMXBean runtimeMX = ManagementFactory.getRuntimeMXBean(); System.out.println("JVM Uptime = "+runtimeMX.getUptime() + " ms"); } }OutputJVM Uptime = 81 msLet us run the code again, to get the following output −JVM Uptime = 78 ms
Read MoreJava Program to implement NOT operation on BigInteger
The BigInteger.not() method returns a BigInteger whose value is (~this). This method returns a negative value if and only if this BigInteger is non-negative.The following is an example −Exampleimport java.math.*; public class Demo { public static void main(String[] args) { BigInteger one, two, three; one = new BigInteger("6"); two = one.not(); System.out.println("Result (not operation): " +two); } }OutputResult (not operation): -7Let us see another example −Exampleimport java.math.*; public class Demo { public static void main(String[] args) { BigInteger bi1, bi2, bi3, bi4; ...
Read MoreDisplay month by name and number in Java
Use the ‘b’ conversion character for month name in Java.Use the ‘m’ conversion character for month number in Java.Here, we are using Formatter and Calendar class, therefore import the following packages.import java.util.Calendar; import java.util.Formatter;The following is an example to display month name and number −Exampleimport java.util.Calendar; import java.util.Formatter; public class Demo { public static void main(String args[]) { Formatter f = new Formatter(); Calendar cal = Calendar.getInstance(); System.out.println("Current date and time: "+cal.getTime()); f ...
Read MorePerform Bubble Sort on strings in Java
To perform Bubble Sort, try the below given code. In this each each pair of adjacent elements is compared and the elements are swapped if they are not in order.The following is an example.Examplepublic class Demo { public static void main(String []args) { String str[] = { "s", "k", "r", "v", "n"}; String temp; System.out.println("Sorted string..."); for (int j = 0; j < str.length; j++) { for (int i = j + 1; i < str.length; i++) { ...
Read MoreDisplay complete date and time information using Formatter in Java
Firstly, create a Formatter and Calendar object.Formatter f = new Formatter(); Calendar cal = Calendar.getInstance();Now display the current date and time. We have shown the date here in both lowercase and uppercase −f = new Formatter(); System.out.println(f.format("Date and Time (lowercase): %tc", cal)); f = new Formatter(); System.out.println(f.format("Date and Time (uppercase): %Tc", cal));The following is an example −Exampleimport java.util.Calendar; import java.util.Formatter; public class Demo { public static void main(String args[]) { Formatter f = new Formatter(); Calendar cal = Calendar.getInstance(); ...
Read MoreDisplay the day in week using SimpleDateFormat('E') in Java
To display the day in week, use the SimpleDateFormat(“E”) as shown below −Format f = new SimpleDateFormat("E"); String strDayinWeek = f.format(new Date()); System.out.println("Day in week = "+strDayinWeek);Since, we have used the Format and SimpleDateFormat class above, therefore import the following packages. With that, we have also used the Date.import java.text.Format; import java.text.SimpleDateFormat; import java.util.Date;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(); SimpleDateFormat simpleformat = new SimpleDateFormat("dd/MMMM/yyyy hh:mm:s"); ...
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