Program to Iterate over a Stream with Indices in Java 8

In Java 8, we can iterate over a stream with indices using the IntStream class. Here's an example program that demonstrates how to do this:

import java.util.stream.IntStream;

public class StreamWithIndicesExample {
    public static void main(String[] args) {
        String[] words = {"hello", "world", "java", "stream"};

        IntStream.range(0, words.length)
                .forEach(i -> System.out.println(i + ": " + words[i]));
    }
}

In this program, we have an array of strings words. We use the IntStream.range method to create a stream of integers from 0 to the length of the array. We then use the forEach method to iterate over the stream and print out each index and its corresponding element in the array.

Output:

0: hello
1: world
2: java
3: stream

Another way to achieve the same result is by using the Stream.iterate method. Here's an example program that demonstrates how to do this:

import java.util.stream.Stream;

public class StreamWithIndicesExample {
    public static void main(String[] args) {
        String[] words = {"hello", "world", "java", "stream"};

        Stream.iterate(0, i -> i + 1)
                .limit(words.length)
                .forEach(i -> System.out.println(i + ": " + words[i]));
    }
}

In this program, we use the Stream.iterate method to create a stream of integers starting from 0 and incrementing by 1. We then use the limit method to limit the stream to the length of the array. Finally, we use the forEach method to iterate over the stream and print out each index and its corresponding element in the array.

Output:

0: hello
1: world
2: java
3: stream