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Java Articles
Page 2 of 450
Why do we need generics in Java?
Reference typesAs we know a class is a blue print in which we define the required behaviors and properties and, an interface is similar to class but it is a Specification (containing abstract methods).These are also considered as datatypes in Java, unlike other primitive datatypes a literal of these kind of types points/refers to the location of the object. They are also known as reference types.GenericsGenerics is a concept in Java where you can enable a class, interface and, method, accept all (reference) types as parameters. In other words it is the concept which enables the users to choose the ...
Read MoreDifference Between Daemon Threads and User Threads In Java
As we know java is a language that supports multi threading and on the basis of nature threads in java are classified into two types Daemon thread and User thread.The following are the important differences between Daemon Threads and User Threads.Sr. No.KeyDaemon ThreadsUser Threads1NatureDaemon thread is low in priority i.e JVM does not care much about these types of threads.User threads are recognized as high priority thread i.e. JVM will wait for any active user thread to get completed.2CPU availabilityIt is not guaranteed that Daemon thread always gets CPU usage whenever it requires due to its low priority.User thread always ...
Read MoreMatching Nonprintable Characters using Java regex
There are 7 common non printable characters used in general and each character has its own hexadecimal representation.NamecharactersHexa-decimal representationbell\a0x07Escape\e0x1BForm feed\f0x0CLine feed0x0ACarriage return\r0X0DHorizontal tab\t0X09Vertical tab\v0X0BExample 1import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexExample1 { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("Enter input text: "); String input = sc.nextLine(); String regex = "\x09"; //Creating a pattern object Pattern pattern = Pattern.compile(regex); //Matching the compiled pattern in the String Matcher matcher = ...
Read MoreDifference between sum of the squares of and square of sum first n natural numbers.
Problem StatementWith a given number n, write a program to find the difference between sum of the squares of and square of sum first n natural numbers.Examplen = 3 Squares of first three numbers = 3x3 + 2x2 + 1x1 = 9 + 4 + 1 = 14 Squares of sum of first three numbers = (3 + 2 + 1)x(3 + 2 + 1) = 6x6 = 36 Difference = 36 - 14 = 22Examplepublic class JavaTester { public static int difference(int n){ //sum of squares of n natural numbers ...
Read MoreDifference between sums of odd and even digits.
Problem StatementWith a given long integer n, write a program to find the difference between sum of the odd digits and even digits to be 0 or not. Index starts from 0.Examplen = 1212112 Sum of odd position elements = 2 + 2 + 1 = 5 Sum of even position elements = 1 + 1 + 1 + 2 = 5 Difference = 5 - 5 = 0 Output = YesExampleclass JavaTester { public static int difference(int n){ return (n % 11); } public static void main(String args[]){ int n = 1212112; System.out.println("Number: " + n); System.out.println(difference(n) == 0 ? "Yes" : "No"); n = 12121121; System.out.println("Number: " + n); System.out.println(difference(n) == 0 ? "Yes" : "No"); } }OutputNumber : 1212112 Output: Yes Number : 12121121 Output: No
Read MoreDifference between sums of odd level and even level nodes of a Binary Tree in Java
Problem StatementWith a given binary tree, write a program to find the difference between sum of nodes at odd level and even level. Assume root at level 1, left/right child of root at level 2 and so on.Example 5 / \ 2 6 / \ \ 1 4 8 / / \ 3 7 9 Sum of nodes at odd level = 5 + 1 + 4 + 8 = 18 Sum of ...
Read MoreDifference between the largest and the smallest primes in an array in Java
Problem StatementWith a given array of integers where all elements are less than 1000000. Find the difference between the largest and the smallest primes in an array.ExampleArray: [ 1, 2, 3, 4, 5 ] Largest Prime Number = 5 Smallest Prime Number = 2 Difference = 5 - 3 = 2.SolutionUse Sieve of Eratosthenes approach, which is an efficient way to find out all prime numbers smaller than a given number. Then we will figure out the largest and smallest prime number to get the required difference.Examplepublic class JavaTester { static int MAX = 1000000; ...
Read MoreDifference between Traits and Abstract Classes in Scala.
TraitsTraits are similar to interfaces in Java and are created using trait keyword.Abstract ClassAbstract Class is similar to abstract classes in Java and are created using abstract keyword.Exampletrait SampleTrait { // Abstract method def test // Non-Abstract method def tutorials() { println("Traits tutorials") } } abstract class SampleAbstractClass { // Abstract method def test // Non-abstract meythod def tutorials() { println("Abstract Class tutorial") } } class Tester extends SampleAbstractClass { def test() { println("Welcome to Tutorialspoint") ...
Read MoreIncremental Java infinite loop
ExampleFollowing is the required program −public class Tester { public static void main(String args[]) { int i = 0; do { i++; System.out.println(i); }while (true); } }The output will keep printing numbers in sequential order.
Read MoreIncremental Java infinite loop
ExampleFollowing is the required program −public class Tester { public static void main(String args[]) { int i = 0; do { i++; System.out.println(i); }while (true); } }The output will keep printing numbers in sequential order.
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