techindepth

import java.util.stream.Collectors;
import java.util.stream.Stream;
 
public class StreamPeekEx {
 
    public static void main(String a[]) {
 
        Stream.of("bus", "car", "bycle", "flight", "train")
                .filter(e -> e.length() > 3)
                .peek(e -> System.out.println("Filtered value: " + e))

techindepth

import java.util.stream.Collectors;
import java.util.stream.Stream;
 
public class StreamPeekEx {
 
    public static void main(String a[]) {
 
        Stream.of("bus", "car", "bycle", "flight", "train")
                .filter(e -> e.length() > 3)
                .peek(e -> System.out.println("Filtered value: " + e))

techindepth

public static void main(String[] args) {
    System.out.println("Stream without terminal operation");
     
    Arrays.stream(new int[] { 1, 2, 3 }).map(i -> {
        System.out.println("doubling " + i);
        return i * 2;
    });
  
    System.out.println("Stream with terminal operation");
        Arrays.stream(new int[] { 1, 2, 3 }).map(i -> {

techindepth

import java.time.LocalTime;
import java.util.Arrays;
import java.util.stream.Stream;

public class SequentialParallelComparison {

    public static void main (String[] args) {
        String[] strings = {"1", "2", "3", "4", "5", "6", "7", "8", "9", "10"};

        System.out.println("-------\nRunning sequential\n-------");

techindepth

targetLongList = 
    sourceLongList.stream().
    filter(l -> l > 100).
    collect(Collectors.toList());

techindepth

@Test
public void testflatMap() throws Exception {
    List<Integer> together = Stream.of(asList(1, 2), asList(3, 4)) // Stream of List<Integer>
            .flatMap(List::stream)
            .map(integer -> integer + 1)
            .collect(Collectors.toList());
    assertEquals(asList(2, 3, 4, 5), together);
    }

techindepth

@Test
public void convertStringToUpperCaseStreams() {
    List<String> collected = Stream.of("a", "b", "hello") // Stream of String 
            .map(String::toUpperCase) // Returns a stream consisting of the results of applying the given function to the elements of this stream.
            .collect(Collectors.toList());
    assertEquals(asList("A", "B", "HELLO"), collected);
}  

techindepth

Stream<String> stringStream = Stream.of("a", "b", "c");
String[] stringArray = stringStream.toArray(size -> new String[size]);
Arrays.stream(stringArray).forEach(System.out::println);

/*Output
a
b
c
*/

techindepth

Map<String, Choice> result =
    choices.stream().collect(Collectors.toMap(Choice::getName,
                                              Function.identity()));

techindepth

<servlet-mapping>
    <servlet-name>dispatcher</servlet-name>
    <url-pattern>/*</url-pattern>
</servlet-mapping>