/
StreamSources.java
96 lines (83 loc) · 2.33 KB
/
StreamSources.java
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package functional.stream.sources;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Stream;
import org.junit.jupiter.api.MethodOrderer;
import org.junit.jupiter.api.Order;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.TestMethodOrder;
/**
* Stream sources as List, Set, Array, Map, Stream.of(), etc.
*/
@TestMethodOrder(MethodOrderer.OrderAnnotation.class)
public class StreamSources {
@Test
@Order(1)
public void streamOfTest() {
Stream.of(4, 2, 3, 5, 9, 6, 1, 8, 7)
.sorted()
.forEach(System.out::println);
}
@Test
@Order(2)
public void streamListTest() {
List<Integer> list = new ArrayList<>();
list.add(1);
list.add(4);
list.add(3);
list.add(2);
list.stream()
.sorted()
.forEach(System.out::println);
}
@Test
@Order(3)
public void streamSetTest() {
Set<Integer> set = new HashSet<>();
set.add(1);
set.add(1); //Set does not allow duplicate elements.
set.add(4);
set.add(3);
set.add(2);
set.stream()
.sorted()
.forEach(System.out::println);
}
@Test
@Order(4)
public void streamArrayTest() {
int[] array = { 1, 4, 3, 2 };
Arrays.stream(array)
.sorted()
.forEach(System.out::println);
}
@Test
@Order(5)
public void streamMapTest() {
Map<String, Integer> map = new HashMap<>();
map.put("Ronaldo", 36);
map.put("Messi", 33);
map.put("Ozil", 32);
map.put("Xavi", 41);
System.out.println("--EntrySet Test--");
map.entrySet()
.stream()
.filter(footballer -> footballer.getValue() > 32)
.forEach(System.out::println);
System.out.println("\n--KeySet Test--");
map.keySet()
.stream()
.filter(footballerName -> footballerName.contains("z"))
.forEach(System.out::println);
System.out.println("\n--Values Test--");
map.values()
.stream()
.filter(footballerAge -> footballerAge > 33)
.forEach(System.out::println);
}
}