Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
Java Articles
Page 58 of 450
DoubleStream min() method in Java
The min() method of the DoubleStream class returns an OptionalDouble describing the minimum element of this stream, or an empty OptionalDouble if this stream is empty.The syntax is as follows:OptionalDoublemin()Here, OptionalDouble is a container object which may or may not contain a double valueTo use the DoubleStream class in Java, import the following package:import java.util.stream.DoubleStream;Create a DoubleStream and add elements to the stream:DoubleStream doubleStream = DoubleStream.of(67.9, 89.9, 10.5, 95.8, 49.6);Get the maximum element from the DoubleStream:OptionalDouble res = doubleStream.max();The following is an example to implement DoubleStream min() method in Java:Exampleimport java.util.OptionalDouble; import java.util.stream.DoubleStream; public class Demo { public static ...
Read MoreDoubleStream count() method in Java
The count() method of the DoubleStream class returns the count of the elements in the stream.The syntax is as follows:long count()To use the DoubleStream class in Java, import the following package:import java.util.stream.DoubleStream;Create DoubleStream and add some elements:DoubleStream doubleStream = DoubleStream.of(50.8, 67.9, 35.7, 23.6, 89.9);Now, get the count of elements in the DoubleStream:long res = doubleStream.count();The following is an example to implement DoubleStream count() method in Java:Exampleimport java.util.stream.DoubleStream; public class Demo { public static void main(String[] args) { DoubleStream doubleStream = DoubleStream.of(50.8, 67.9, 35.7, 23.6, 89.9); long res = doubleStream.count(); System.out.println("Count ...
Read MoreIntStream summaryStatistics() method in Java
The summaryStatistics() method in the IntStream class is used to return summary data about the elements of this stream. The syntax is as follows:IntSummaryStatistics summaryStatistics()Create an IntStream and add some elements:IntStream intStream = IntStream.of(30, 60, 90);Now, get the summary data about the above elements:IntSummaryStatistics details = intStream.summaryStatistics();The following is an example to implement IntStream summaryStatistics() method in Java:Exampleimport java.util.stream.IntStream; import java.util.IntSummaryStatistics; public class Demo { public static void main(String[] args) { IntStream intStream = IntStream.of(30, 60, 90); IntSummaryStatistics details = intStream.summaryStatistics(); System.out.println("Details = "+details); } }OutputDetails = IntSummaryStatistics{count=3, sum=180, ...
Read MoreJava Program to get prime numbers using the Sieve of Eratosthenes algorithm
To find all prime numbers up to any given limit, use the Sieve of Eratosthenes algorithm. At first we have set the value to be checked −int val = 30;Now, we have taken a boolean array with a length one more than the val −boolean[] isprime = new boolean[val + 1];Loop through val and set numbers as TRUE. Also, set 0 and 1 as false since both these number are not prime −isprime[0] = false; isprime[1] = false;Following is an example showing rest of the steps to get prime numbers using the Sieve of Eratosthenes algorithm −Examplepublic class Demo { ...
Read MoreHow to convert Integer array list to integer array in Java?
To convert integer array list to integer array is not a tedious task. First, create an integer array list and add some elements to it −ArrayList < Integer > arrList = new ArrayList < Integer > (); arrList.add(100); arrList.add(200); arrList.add(300); arrList.add(400); arrList.add(500);Now, assign each value of the integer array list to integer array. We used size() to get the size of the integer array list and placed the same size to the newly created integer array −final int[] arr = new int[arrList.size()]; int index = 0; for (final Integer value: arrList) { arr[index++] = value; }Exampleimport java.util.ArrayList; public class ...
Read MoreJava Program to calculate the area of a triangle using Heron's Formula
Heron’s formula gives the area of a triangle when the length of all three sides are already known.Let’s say we have the following three sides of a triangle −s1 = 15191235.0; s2 = 15191235.0; s3 = 1.01235479;Now, use the Heron’s formulae to find the area −area = (s1+s2+s3)/2.0d; resArea = Math.sqrt(area* (area - s1) * (area - s2) * (area - s3));Examplepublic class Demo { public static void main(String[] args) { // sides of a triangle double s1, s2, s3; double area, resArea; // three sides of ...
Read MoreInsert an element to List using ListIterator in Java
Let us first create an ArrayList −ArrayList < Integer > arrList = new ArrayList < Integer > (); arrList.add(100); arrList.add(200); arrList.add(300); arrList.add(400); arrList.add(500);Now, create a ListIterator from the above ArrayList and insert more elements −ListIterator < Integer > iterator = arrList.listIterator(); iterator.add(1000); iterator.add(2000); iterator.add(3000);Exampleimport java.util.ArrayList; import java.util.ListIterator; public class Demo { public static void main(String[] args) { ArrayListarrList = new ArrayList(); arrList.add(100); arrList.add(200); arrList.add(300); arrList.add(400); arrList.add(500); arrList.add(600); arrList.add(700); arrList.add(800); ListIteratoriterator = arrList.listIterator(); iterator.add(1000); iterator.add(2000); iterator.add(3000); for (Integer i: arrList) { System.out.println(i); } } }output1000 2000 3000 100 200 300 400 500 600 700 800
Read MoreGenerate 10 random four-digit numbers in Java
To generated random integer, use the Random class with nextInt. At first, create a Random object −Random rand = new Random();The Random above is a random number generator. Now, pick the random numbers one by one. We want 10 random four-digit numbers, therefore loop it until i = 1 to 10 −for (int i = 1; i
Read MoreJava Program to generate custom random number -1 or 1
To generate custom random number 1 or -1, you need to use nextBoolean(). At first take a loop and create a Random object on each iteration −for (int i = 0; i < 5; i++) { Random rand = new Random(); }Now, use nextBoolean() to generate 1 on TRUE condition, ekse -1 −for (int i = 0; i < 5; i++) { Random rand = new Random(); if (rand.nextBoolean()) System.out.println(1); else System.out.println(-1); }Exampleimport java.util.Random; public class Demo { public static void main(String[] args) { for (int ...
Read MoreHow to generate a random BigInteger value in Java?
To generate random BigInteger in Java, let us first set a min and max value −BigInteger maxLimit = new BigInteger("5000000000000"); BigInteger minLimit = new BigInteger("25000000000");Now, subtract the min and max −BigInteger bigInteger = maxLimit.subtract(minLimit); Declare a Random object and find the length of the maxLimit: Random randNum = new Random(); int len = maxLimit.bitLength();Now, set a new B integer with the length and the random object created above.Exampleimport java.math.BigInteger; import java.util.Random; public class Demo { public static void main(String[] args) { BigInteger maxLimit = new BigInteger("5000000000000"); BigInteger minLimit = new BigInteger("25000000000"); ...
Read More