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Extract Data from a Stream

Harinath
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Extract data from an object using peek() and map() methods

Let us start with a simple example

// { autofold
import java.util.stream.Stream;
public class Main {
public static void main(String[] args) {
// }
long count = Stream.of(1, 2, 3, 4, 5).map(i -> i * i).count();
System.out.printf("This stream has %d elements", count);
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Square each element in the above stream and print

// { autofold
import java.util.stream.Stream;
public class Main {
public static void main(String[] args) {
// }
long count = Stream.of(1, 2, 3, 4, 5)
.map(i -> i * i)
.peek(i -> System.out.printf("%d ", i))
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

The map() operation in the stream applies the given lambda function(i - > i * i) as an argument on the elements of the stream. The count method returns the value 5. To Print the square value of each value in the stream, we used intermediate method peek().

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