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Articles on Trending Technologies
Technical articles with clear explanations and examples
Replace '*' with '^' with Java Regular Expressions
To replace *' with '^' using Java Regular Expressions, we need to use the replaceAll() method. The replaceAll() method returns a String replacing all the character sequence matching the regular expression and String after replacement.Declaration − The java.lang.String.replaceAll() method is declared as follows −public String replaceAll(String regex, String replaced) Let us see a program to replace '*' with '^' using Java Regular Expressions −Examplepublic class Example { public static void main( String args[] ) { String str = new String("H*e*l*l*o"); System.out.println( "Initial String : "+ str); // replacing '*' with ...
Read MoreContainsKey() method in C#
Set a Hashtable collection and add some elements to it.Hashtable h = new Hashtable(); h.Add(1, "Sam"); h.Add(2, "Jack"); h.Add(3, "Andy"); h.Add(4, "Katie"); h.Add(5, "Beth"); h.Add(6, "Benjamin");Use the ContainsKey() method to check whether a key exists in a Hashtable or not.Let’s check for key 3. It returns True of the key is found.h.ContainsKey(3));Exampleusing System; using System.Collections; public class Demo { public static void Main() { Hashtable h = new Hashtable(); h.Add(1, "Sam"); h.Add(2, "Jack"); h.Add(3, "Andy"); h.Add(4, "Katie"); h.Add(5, "Beth"); ...
Read MoreHow to use StringBuilder in C#?
With StringBuilder, you can expand the number of characters in the string. String cannot be changed once it is created, but StringBuildercan be expanded. It does not create a new object in the memory.Initialize StringBuilder.StringBuilder str = new StringBuilder();Let us see an example to learn how to work with StringBuilder in C#.Exampleusing System; using System.Text; public class Program { public static void Main() { StringBuilder str = new StringBuilder("Web World!!",30); str.Replace("World", "Arena"); Console.WriteLine(str); } }OutputWeb Arena!!Above the Replace() method of StringBuilder is used to to replace a string in C#.
Read MoreC++ Program to Multiply two Numbers
Multiplication of two numbers a and b yields their product. Value of a is added as many times as the value of b to get the product of a and b.For example.5 * 4 = 20 7 * 8 = 56 9 * 9 = 81Program to Multiply two Numbers using * OperatorA program to multiply two numbers using the * operator is given as follows −Example#include using namespace std; int main() { int a = 6, b = 8; cout
Read MoreReplace one string with another string with Java Regular Expressions
To replace one string with another string using Java Regular Expressions, we need to use the replaceAll() method. The replaceAll() method returns a String replacing all the character sequence matching the regular expression and String after replacement.Declaration − The java.lang.String.replaceAll() method is declared as follows −public String replaceAll(String regex, String replaced) Let us see a program to replace one string with another string using Java Regular Expressions −Examplepublic class Example { public static void main( String args[] ) { String str = new String("Good Harry Good"); System.out.println( "Initial String : "+ str); ...
Read MoreClear a Hashtable in C#
Clear a Hashtable, using the Clear() method in C#.The following is our Hashtable −Hashtable h = new Hashtable(); h.Add(1, "Amit"); h.Add(2, "Sachin"); h.Add(3, "Rahul");Use the clear method.h.Clear();If you will now try to display the Hashtable, nothing would get display since the Hashtable is empty.Exampleusing System; using System.Collections; public class Demo { public static void Main() { Hashtable h = new Hashtable(); h.Add(1, "Amit"); h.Add(2, "Sachin"); h.Add(3, "Rahul"); Console.WriteLine("Keys and Values list:"); foreach (var key in h.Keys ) { ...
Read MoreC++ Program to Check Whether a Number is Palindrome or Not
A palindrome number remains the same if its digits are reversed i.e its value does not change. A palindrome number can also be called symmetric. For example: The numbers 12321, 1551, 11 etc are palindromes as they do not change even if their digits are reversed.A program that checks if a number is palindrome or not is as follows.Example#include using namespace std; void palindrome(int num) { int rev=0,val; val = num; while(num > 0) { rev = rev * 10 + num % 10; num = num / 10; } if(val==rev) cout
Read MoreCheck two numbers for equality in Java
To check two numbers for equality in Java, we can use the Equals() method as well as the == operator.Firstly, let us set Integers.Integer val1 = new Integer(5); Integer val2 = new Integer(5);Now, to check whether they are equal or not, let us use the == operator.(val1 == val2)Let us now see the complete example.Examplepublic class Demo { public static void main( String args[] ) { Integer val1 = new Integer(5); Integer val2 = new Integer(5); Integer val3 = new Integer(10); System.out.println("Integer 1 = "+val1); ...
Read MoreGet the list of all the public fields in Java
An array of field objects is returned by the method java.lang.Class.getFields(). These field objects include the accessible public fields of the class that is represented by the class object.Also, the getFields() method returns a zero length array if the class or interface has no public fields that are accessible or if a primitive type, array class or void is represented in the Class object.A program that demonstrates this is given as follows −Exampleimport java.lang.reflect.*; public class Demo { public static void main(String[] argv) throws Exception { Class c = java.lang.Thread.class; Field[] fields = ...
Read MoreHow to use the ?: conditional operator in C#?
A conditional operator is represented by the symbol '?:' The first operand is the evaluating expression. It has right to left associativity.The syntax for conditional operator.expression ? expression : expressionThe conditional operator works as follows −The first operand is implicitly converted to bool.If the first operand evaluates to true, the second operand is evaluated.If the first operand evaluates to false, the third operand is evaluated.Remember, only one of the last two operands is evaluated in a conditional expression.Exampleusing System; namespace Demo { class Program { static void Main(string[] args) { int num1 ...
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