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Java Articles
Page 120 of 450
How to swap two String variables without third variable.
To swap the contents of two strings (say s1 and s2) without the third, first of all concatenate them and store in s1. Now using the substring() method of the String class store the value of s1 in s2 and vice versa.Examplepublic class Sample { public static void main(String args[]){ String s1 = "tutorials"; String s2 = "point"; System.out.println("Value of s1 before swapping :"+s1); System.out.println("Value of s2 before swapping :"+s2); int i = s1.length(); s1 = s1+s2; s2 = s1.substring(0, ...
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 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 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 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 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 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 MoreDifference between HashMap and HashSet in Java.
HashMap and HashSet both are one of the most important classes of Java Collection framework.Following are the important differences between HashMap and HashSet.Sr. No.KeyHashMapHashSet1ImplementationHashmap is the implementation of Map interface.Hashset on other hand is the implementation of set interface.2Internal implementationHashmap internally do not implements hashset or any set for its implementation.Hashset internally uses Hashmap for its implementation.3Storage of elementsHashMap Stores elements in form of key-value pair i.e each element has its corresponding key which is required for its retrieval during iteration.HashSet stores only objects no such key value pairs maintained.4Method to add elementPut method of hash map is used to ...
Read MoreJava Program to count letters in a String
Let’s say we have the following string, that has some letters and numbers.String str = "9as78";Now loop through the length of this string and use the Character.isLetter() method. Within that, use the charAt() method to check for each character/ number in the string.for (int i = 0; i < str.length(); i++) { if (Character.isLetter(str.charAt(i))) count++; }We have set a count variable above to get the length of the letters in the string.Here’s the complete example.Examplepublic class Demo { public static void main(String []args) { String str = "9as78"; int count = ...
Read MoreHow to create date object in Java?
Using the Date classYou can create a Date object using the Date() constructor of java.util.Date constructor as shown in the following example. The object created using this constructor represents the current time.Exampleimport java.util.Date; public class CreateDate { public static void main(String args[]) { Date date = new Date(); System.out.print(date); } }OutputThu Nov 02 15:43:01 IST 2018Using the SimpleDateFormat classUsing the SimpleDateFormat class and the parse() method of this you can parse a date string in the required format and create a Date object representing the specified date.Exampleimport java.text.ParseException; import java.text.SimpleDateFormat; ...
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