java_upgrade/src/main/java/RandomDemo.java at master · amhtech/java_upgrade · GitHub

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import java.util.OptionalInt;

import java.util.Random;

import java.util.stream.IntStream;

public class RandomDemo {

public static void main(String[] args) {

Random r = new Random();

int sum = IntStream.generate(() -> r.nextInt(10))

.limit(10)

.map(n -> {

System.out.println("n = " + n);

return n;

})

.filter(n -> n % 2 == 0) // only even numbers

.peek(System.out::println)

.map(n -> n * 2)

.sum();

System.out.println(sum);

System.out.println("Filtering integers:");

OptionalInt first = IntStream.generate(() -> r.nextInt(10))

.peek(System.out::println)

.filter(n -> n > 7)

.findFirst();

}

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