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Articles on Trending Technologies
Technical articles with clear explanations and examples
What is the class "class" in Java?
The Java.lang.Class class instance represent classes and interfaces in a running Java application. It has no public constructor. Example Following is the example demonstrates the usage of the class Class. The java.lang.Class.getCanonicalName() method returns the canonical name of the underlying class as defined by the Java Language Specification. It returns null if the class does not have a canonical name. import java.lang.*; public class ClassDemo { public static void main(String[] args) { ClassDemo c = new ClassDemo(); Class cls = c.getClass(); ...
Read MoreModular Exponentiation (Power in Modular Arithmetic) in java
The java.math.BigInteger.modPow(BigInteger exponent, BigInteger m) returns a BigInteger whose value is (thisexponent mod m). Unlike pow, this method permits negative exponents. You can calculate the modular Exponentiation using this method.Programimport java.math.*; public class BigIntegerDemo { public static void main(String[] args) { // create 3 BigInteger objects BigInteger bi1, bi2, bi3; // create a BigInteger exponent BigInteger exponent = new BigInteger("2"); bi1 = new BigInteger("7"); bi2 = new BigInteger("20"); // perform modPow operation on bi1 using bi2 and exp bi3 = bi1.modPow(exponent, bi2); String str = bi1 + "^" +exponent+ " mod " + bi2 + " is " +bi3; // print bi3 value System.out.println( str ); } }Output:7^2 mod 20 is 9
Read MoreHow to iterate over arrays and objects in jQuery?
To iterate over arrays and objects in jQuery, use the jQuery forEach() loop. You can try to run the following code to learn how to iterate over arrays and objects −Example $(document).ready(function(){ $("#button1").click(function(){ var arr = [{subject: "Maths", id:3}, {subject: "History", id:7}]; arr.forEach(function(el, index) { alert(el.id+" "+el.subject); }); }); }); Result
Read MoreModular multiplicative inverse in java
The java.math.BigInteger.modInverse(BigInteger m) returns a BigInteger whose value is (this-1 mod m). Using this method you can calculate Modular multiplicative inverse for a given number.Programimport java.math.*; public class BigIntegerDemo { public static void main(String[] args) { // create 3 BigInteger objects BigInteger bi1, bi2, bi3; // create a BigInteger exponent BigInteger exponent = new BigInteger("2"); bi1 = new BigInteger("7"); bi2 = new BigInteger("20"); // perform modPow operation on bi1 using bi2 and exp bi3 = bi1.modPow(exponent, bi2); String str = bi1 + "^" +exponent+ " mod " + bi2 + " is " +bi3; // print bi3 value System.out.println( str ); } }Output7^2 mod 20 is 9
Read MoreHow to convert a Java String to an Int?
The parseXxx() method is used to get the primitive data type of a certain String. In this case to convert a String to integer you could use the parseInt() method.Examplepublic class Test { public static void main(String args[]) { int x =Integer.parseInt("9"); double c = Double.parseDouble("5"); int b = Integer.parseInt("444",16); System.out.println(x); System.out.println(c); System.out.println(b); } }Output9 5.0 1092
Read MoreWhat is the difference between super and this, keywords in Java?
The this is a keyword in Java which is used as a reference to the object of the current class. Using it you can − Differentiate the instance variables from local variables if they have same names, within a constructor or a method. Call one type of constructor (parametrized constructor or default) from other in a class. It is known as explicit constructor invocation. Example class Superclass { int age; Superclass(int age) { this.age = age; } public void ...
Read MoreWrite a Java program to capitalize each word in the string?
You can capitalize words in a string using the toUpperCase() method of the String class. This method converts the contents of the current string to Upper case letters.Examplepublic class StringToUpperCaseEmp { public static void main(String[] args) { String str = "string abc touppercase "; String strUpper = str.toUpperCase(); System.out.println("Original String: " + str); System.out.println("String changed to upper case: " + strUpper); } }OutputOriginal String: string abc touppercase String changed to upper case: STRING ABC TOUPPERCASE
Read MoreJava Program to check whether one String is a rotation of another.
To find weather a string is rotation of another, concat the first string to itself twice and find weatherExamplepublic class Sample { public static void main(String args[]){ String str1 = "gala"; String str2 = "alag"; String s3 = str1+str1; if(s3.contains(str2)) { System.out.println("str1 is rotation of str2"); } else { System.out.println("str1 is not rotation of str2"); } } }
Read MorePollard's Rho Algorithm for Prime Factorization in java
It is an algorithm to perform factorization on given integers. Following is the program implementing the Rho Algorithm for Prime Factorization.Programpublic class PollardsRho { int num = 65; public int gcd(int a, int b) { int gcd = 0; for(int i = 1; i
Read MoreWhere do we use $.extend() method in jQuery?
The jQuery.extend() method is used to merge contents of two or more objects together. The object is merged into the first object. You can try to run the following code to learn how to use extend() method −Example $(document).ready(function() { $("#button1").click(function() { var obj1 = { maths: 60, history: {pages: 150,price: 400,lessons: 30}, science: 120 }; var obj2 = { history: { price: 150, lessons: 24 }, economics: 250 }; $.extend(true, obj1, obj2); $("#demo").append(JSON.stringify(obj1)); }); }); Result
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