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Articles on Trending Technologies
Technical articles with clear explanations and examples
Reverse an Integer in Java
To reverse an integer in Java, try the following code −Exampleimport java.lang.*; public class Demo { public static void main(String[] args) { int i = 239, rev = 0; System.out.println("Original: " + i); while(i != 0) { int digit = i % 10; rev = rev * 10 + digit; i /= 10; } System.out.println("Reversed: " + rev); } }OutputOriginal: 239 Reversed: 932In the above program, we have the following int value, which we will reverse.int i = 239;Now, loop through until the value is 0. Find the remainder and perform the following operations to get the reverse of the given integer 239.while(i != 0) { int digit = i % 10; rev = rev * 10 + digit; i /= 10; }
Read MoreHow to assign int value to char variable in Java
To assign int value to a char variable in Java would consider the ASCII value and display the associated character/ digit.Here, we have a char.char val;Now assign int value to it.val = 77;Now, when you will print the value of “val”, it would display the character associate with the value (ASCII) 77.The following is the complete example.Examplepublic class Demo { public static void main(String []args) { char val; val = 77; System.out.print("Value: "); System.out.println(val); } }OutputValue: M
Read MoreHexadecimal literal of type long in Java
Hexadecimal literal of type long is represented as − long hexLong = 0XABL; For Hexadecimal, the 0x or 0X is to be placed in the beginning of a number. Note − Digits 10 to 15 are represented by a to f (A to F) in Hexadecimal Example public class Demo { public static void main(String []args) { long hexLong = 0XABL; System.out.println("Hexadecimal literal of type long: "+hexLong); } } Output Hexadecimal literal of type long:171
Read MoreJava Program to return a Date set to the last possible millisecond of the minute
Let us first set the calendar object −Calendar calendar = Calendar.getInstance();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 milliseconds.For seconds −calendar.set(Calendar.SECOND, calendar.getMaximum(Calendar.SECOND));For milliseconds −calendar.set(Calendar.MILLISECOND, calendar.getMaximum(Calendar.MILLISECOND));The following is an example that returns a Date set to the last possible millisecond of the minute −Exampleimport java.util.Calendar; import java.util.GregorianCalendar; public class Demo { public static void main(String[] argv) throws Exception { Calendar calendar = Calendar.getInstance(); // seconds calendar.set(Calendar.SECOND, calendar.getMaximum(Calendar.SECOND)); // milliseconds ...
Read MoreGet Operating System temporary directory / folder in Java
To get the temporary directory in Java, use the System.getProperty() method. Use theIt’s syntax is −String getProperty(String key)Above, the key is the name of the system property. Since, we want the Java Home Directory name, therefore we will add the key as −java.io.tmpdirThe following is an example −Examplepublic class Demo { public static void main(String []args){ String strTmp = System.getProperty("java.io.tmpdir"); System.out.println("OS current temporary directory: " + strTmp); System.out.println("OS Name: " + System.getProperty("os.name")); System.out.println("OS ...
Read MoreDump the content of an array in Java
An array can be easily printed by using the method java.util.Arrays.toString() in Java. This method returns a string representation of the array contents that is enclosed in square brackets. If the array is null, then this method returns null.A program that demonstrates this is given as follows −Exampleimport java.util.Arrays; public class Demo { public static void main(String args[]) { String str[] = {"John", "Harry", "Sally", "Emma", "Peter"}; System.out.println("The array content is:"); System.out.println(Arrays.toString(str)); } }OutputThe array content is: [John, Harry, Sally, Emma, Peter]Now let us understand the above program.The string ...
Read MoreDefine integer literals as octal values in Java
Literals with a leading zero are octal literals. Any number prefixed with a 0 is considered octal. Octal numbers can only use digits 0-7, just like decimal can use 0-9, and binary can use 0-1. To define integer literals as octal value in Java is effortless. Here is the declaration and initialization. int myOct = 023; Example public class Demo { public static void main(String []args) { int myOct = 023; System.out.println(myOct); } } Output 19 Let us see another example. Example public class Demo { public static void main(String []args) { int myOct = 010; System.out.println(myOct); } } Output 8
Read MoreLocale-specific formatting in Java
For locale-specific formatting, firstly import the following packages.import java.util.Calendar; import java.util.Formatter; import java.util.Locale;Create a Formatter and Calendar object −Formatter f = new Formatter(); Calendar c = Calendar.getInstance();We are formatting for different Locales −f.format(Locale.TAIWAN, "Locale.TAIWAN: %tc", c); f.format(Locale.ITALY, "Locale.ITALY: %tc", c);The following is an example −Exampleimport java.util.Calendar; import java.util.Formatter; import java.util.Locale; public class Demo { public static void main(String args[]) { Formatter f = new Formatter(); Calendar c = Calendar.getInstance(); f.format(Locale.TAIWAN, "Locale.TAIWAN: %tc", c); ...
Read MoreJava program to display Astrological sign or Zodiac sign for given date of birth
Each date of birth corresponds to a given Zodiac sign. A table that demonstrates these signs and their corresponding dates is given below −Zodiac SignDateAriesMarch 21 - April 19TaurusApril 20 - May 20GeminiMay 21 - June 20CancerJune 21 - July 22LeoJuly 23 - August 22VirgoAugust 23 - September 22LibraSeptember 23 - October 22ScorpioOctober 23 - November 21SagittariusNovember 22 - December 21CapricornDecember 22 - January 19AquariusJanuary 20 - February 18PiscesFebruary 19 - March 20A program that displays the Astrological sign or Zodiac sign for a given date of birth is given as follows.Examplepublic class Example { public static void main ...
Read MoreFormat Output with Formatter in Java
For Formatter, import the following package −import java.util.Formatter;Now create a Formatter object −Formatter f1 = new Formatter();Now, we will format the output with Formatter −f1.format("Rank and Percentage of %s = %d %f", "John", 2, 98.5);The following is an example −Exampleimport java.util.Formatter; public class Demo { public static void main(String args[]) { Formatter f1 = new Formatter(); Formatter f2 = new Formatter(); f1.format("Rank and Percentage of %s = %d %f", "John", 2, 98.5); System.out.println(f1.toString()); ...
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