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Articles on Trending Technologies
Technical articles with clear explanations and examples
Java program to extract 'k' bits from a given position
Extraction of k bits from the given position in a number involves converting the number into its binary representation. An example of this is given as follows −Number = 20 Binary representation = 10100 k = 3 Position = 2 The bits extracted are 010 which represent 2.A program that demonstrates this is given as follows.Examplepublic class Example { public static void main (String[] args) { int number = 20, k = 3, pos = 2; int exNum = ((1 > (pos - 1)); System.out.println("Extract " + k + " ...
Read MoreDisplay the Operating System name in Java
Use the System.getProperty() method in Java to get the Operating System name.It’s syntax is −String getProperty(String key)Above, the key is the name of the system property. Since, we want the OS name, therefore we will add the key as −os.nameExamplepublic class Demo { public static void main(String[] args) { System.out.print("Operating System: "); System.out.println(System.getProperty("os.name")); } }OutputOperating System: Linux
Read MoreSpace format specifiers in Java
For format specifier, import the following package −import java.util.Formatter;Create a formatter object and set space format specifier −Formatter f = new Formatter(); f.format("% d", -50); System.out.println(f); f = new Formatter(); f.format("% d", 90); System.out.println(f); f = new Formatter(); f.format("%10d", -50); System.out.println(f); f = new Formatter(); f.format("% 10d", 90); System.out.println(f);The following is an example displaying different forms of space format specifiers −Exampleimport java.util.Formatter; public class Demo { public static void main(String args[]) { Formatter f = new Formatter(); f.format("% d", -50); ...
Read MoreSwap elements of ArrayList with Java collections
In order to swap elements of ArrayList with Java collections, we need to use the Collections.swap() method. It swaps the elements at the specified positions in the list.Declaration −The java.util.Collections.swap() method is declared as follows −public static void swap(List list, int i, int j)where i is the index of the first element to be swapped, j is the index of the other element to be swapped and list is the list where the swapping takes place.Let us see a program to swap elements of ArrayList with Java collections −Exampleimport java.util.*; public class Example { public static void main ...
Read MoreConvert string to char array in Java
The following is our string.String str = "Tutorial";Now, use the toCharArray() method to convert string to char array.char[] ch = str.toCharArray();Now let us see the complete example.Examplepublic class Demo { public static void main(String []args) { String str = "Tutorial"; System.out.println("String: "+str); char[] ch = str.toCharArray(); System.out.println("Character Array..."); for (int i = 0; i < ch.length; i++) { System.out.print(ch[i]+" "); } } }OutputString: Tutorial Character Array... T u t o r i a l
Read MoreDetermine if a String is a legal Java Identifier
To determine if a String is a legal Java Identifier, use the Character.isJavaIdentifierPart() and Character.isJavaIdentifierStart() methods.Character.isJavaIdentifierPart()The java.lang.Character.isJavaIdentifierPart() determines if the character (Unicode code point) may be part of a Java identifier as other than the first character.A character may be part of a Java identifier if any of the following are true.it is a letterit is a currency symbol (such as '$')it is a connecting punctuation character (such as '_')it is a digitit is a numeric letter (such as a Roman numeral character)Character.isJavaIdentifierStart()The java.lang.Character.isJavaIdentifierStart() determines if the character (Unicode code point) is permissible as the first character in a Java ...
Read MoreFormatting a Negative Number Output with Parentheses in Java
A negative number output can be shown using the Formatter object −Formatter f = new Formatter(); f.format("%12.2f", -7.598); System.out.println(f);Try the below given code to format a Negative Number Output with Parentheses −Formatter f = new Formatter(); f.format("%(d", -50); System.out.println(f);The following is an example −Exampleimport java.util.Formatter; public class Demo { public static void main(String args[]) { Formatter f = new Formatter(); f.format("% d", 50); System.out.println(f); // negative number inside parentheses f = new Formatter(); f.format("%(d", -50); System.out.println(f); } }Output50 (50)
Read MoreTokenizing a String in Java
We have the following string −String str = "This is demo text, and demo line!";To tokenize the string, let us split them after every period (.) and comma (,)String str = "This is demo text, and demo line!";The following is the complete example.Examplepublic class Demo { public static void main(String[] args) { String str = "This is demo text, and demo line!"; String[] res = str.split("[, .]", 0); for(String myStr: res) { System.out.println(myStr); } } }OutputThis is demo text and demo line!
Read MoreAdd grouping specifiers for large numbers in Java
For using the Formatter class, import the following package −import java.util.Formatter;We can group specifiers as shown below −Formatter f = new Formatter(); f.format("%,.2f", 38178.9889);The above sets thousands separator and 2 decimal places.The following is an example −Exampleimport java.util.Formatter; public class Demo { public static void main(String args[]) { Formatter f = new Formatter(); f.format("%d", 50); System.out.println(f); f = new Formatter(); f.format("%,.2f", 38178.9889); System.out.println(f); } }Output50 38,178.99
Read MoreThe # format flag in Java
Apply the # flag to the %o, %x, %e, and %f format specifiers. If you want to display the hexadecimal number with a 0x prefix, then precede the %x specifier with #.Preceding the %x specifier with a #, the hexadecimal number will be printed with a 0x prefix.Let us see an example wherein $e is used. It includes a decimal point, even if the decimal digits are not present −Exampleimport java.util.Formatter; public class Demo { public static void main(String args[]) { Formatter f = new Formatter(); System.out.println(f.format("%#e", 5F)); } }Output5.000000e+00
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