StreamsAPI-Tutorials/StreamExamples/IntStreamExamples.java at main · CodeJamm/StreamsAPI-Tutorials · GitHub

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package StreamExamples;

import java.util.Arrays;

import java.util.function.IntPredicate;

import java.util.stream.Collectors;

import java.util.stream.IntStream;

import java.util.List;

public class IntStreamExamples

{

public static void main(String[] args)

{

//IntStream.of() method -> creating an Intstream of data

IntStream.of(1,2,3).forEach(e->System.out.print(e+" "));

System.out.println();

//IntStream.range() method -> start inclusive and end exclusive

IntStream.range(1, 5).forEach(e->System.out.print(e+" "));

System.out.println();

//IntStream.rangeClosed() method -> both start and end are inclusive

IntStream.rangeClosed(0, 4).forEach(e->System.out.print(e+" "));

System.out.println();

//IntStream.iterate() method -> acts like a loop

IntStream.iterate(0, i -> i + 2).limit(10).forEach(e->System.out.print(e+" "));

System.out.println();

//IntStream.generate() method -> generates n random numbers as mentioned in limit()

IntStream.generate(()->{return (int)(Math.random() * 10000);})

.limit(10).forEach(e->System.out.print(e+" "));

System.out.println();

//prints primes numbers within a given range by calling the isPrime function using lambda expression

IntStream.range(1, 100).filter(IntStreamExamples::isPrime).boxed()

.collect(Collectors.toList()).forEach(e->System.out.print(e+" "));

System.out.println();

//IntStream to Array using toArray() method

int[] intArray = IntStream.of(1, 2, 3, 4, 5).toArray();

System.out.println(Arrays.toString(intArray));

//IntStream to list using toList() method -> boxed streams

List<Integer> ints = IntStream.of(1,2,3,4,5).boxed().collect(Collectors.toList());

System.out.println(ints);

//IntStream to list using toList() method -> mapping integers to list

List<Integer> list = IntStream.of(1,2,3,4,5)

.mapToObj(Integer::valueOf).collect(Collectors.toList());

System.out.println(list);

}

public static boolean isPrime(int i)

{

IntPredicate isDivisible = index -> i % index == 0;

return i > 1 && IntStream.range(2, i).noneMatch(isDivisible);

}

StreamsAPI-Tutorials/StreamExamples/IntStreamExamples.java at main · CodeJamm/StreamsAPI-Tutorials · GitHub

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