Merge pull request #15804 from Neetika23/RangeStream

Stream file

core-java-modules/core-java-streams/src/test/java/com/baeldung/stream/range/StreamRangeUnitTest.java

@@ -0,0 +1,38 @@
+package com.baeldung.stream.range;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.stream.Collectors;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class StreamRangeUnitTest {
+
+    @Test
+    public void whenRangeStreamUsingLimitSkip_thenPrintsRange() {
+        List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
+        List<Integer> expectedRange = Arrays.asList(3, 4, 5, 6, 7);
+
+        List<Integer> range = numbers.stream()
+                .skip(2)
+                .limit(5)
+                .collect(Collectors.toList());
+
+        assertEquals(expectedRange, range);
+    }
+
+    @Test
+    public void whenRangeStreamUsingCollectingAndThen_thenPrintsRange() {
+        List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
+        List<Integer> expectedRange = Arrays.asList(3, 4, 5, 6, 7);
+
+        List<Integer> range = numbers.stream()
+                .filter(n -> n >= 3 && n <= 7)
+                .collect(Collectors.collectingAndThen(Collectors.toList(), Collections::unmodifiableList));
+
+        assertEquals(expectedRange, range);
+    }
+}