package examples;

import java.util.ArrayList;

import java.util.stream.Stream;

public class Example1 {

public static void main(String[] args) {

// An ArrayList of Integer numbers.

ArrayList<Integer> list = new ArrayList<>();

// adding 10 random numbers to the list

for (int i = 0; i < 10; i++) {

// a random number from 1 (inclusive) to 100 (exclusive)

int randomNumber = (int) ((Math.random() * 100) + 1);

list.add(randomNumber);

}

System.out.println("Original List: " + list);

// Create a "Stream" for the ArrayList.

Stream<Integer> stream = list.stream();

// let us find out the smallest element in the list

var smallestElement = stream.min(Integer::compare);

// let us print out the smallest element

if (smallestElement.isPresent()) {

System.out.println(smallestElement.get());

}

// OR we can simplify it like this

smallestElement.ifPresent(System.out::println);

// create another stream for the arraylist

stream = list.stream();

// we can find out the largest element in the list also

var largestElement = stream.max(Integer::compare);

largestElement.ifPresent(System.out::println);

// let us sort the list

Stream<Integer> sortedStream = list.stream().sorted();

// let us print all the element in this sorted stream

System.out.println("These are the elements in the sorted stream: ");

sortedStream.forEach(number -> System.out.print(number + " "));

// let's say we want to find out all the odd numbers from the arraylist

// we can do this like

// 1. Create a stream for the data source

stream = list.stream();

// 2. Apply any intermediate functions

stream = stream.sorted().filter(number -> number % 2 != 0);

// let us print the numbers now

System.out.println("\nAll the odd valued elements in the arraylist: ");

stream.forEach(number -> System.out.print(number + " "));

}

}