diff --git a/core-java-12/pom.xml b/core-java-12/pom.xml
new file mode 100644
index 0000000000..729b29381b
--- /dev/null
+++ b/core-java-12/pom.xml
@@ -0,0 +1,48 @@
+
+
+ 4.0.0
+ com.baeldung
+ core-java-12
+ 0.1.0-SNAPSHOT
+ core-java-12
+ jar
+ http://maven.apache.org
+
+
+ com.baeldung
+ parent-modules
+ 1.0.0-SNAPSHOT
+
+
+
+
+ org.assertj
+ assertj-core
+ ${assertj.version}
+ test
+
+
+
+
+
+
+ org.apache.maven.plugins
+ maven-compiler-plugin
+ ${maven-compiler-plugin.version}
+
+ ${maven.compiler.source.version}
+ ${maven.compiler.target.version}
+
+
+
+
+
+
+ 12
+ 12
+ 3.6.1
+
+
+
\ No newline at end of file
diff --git a/core-java-12/src/test/java/com/baeldung/collectors/CollectorsUnitTest.java b/core-java-12/src/test/java/com/baeldung/collectors/CollectorsUnitTest.java
new file mode 100644
index 0000000000..68915b504d
--- /dev/null
+++ b/core-java-12/src/test/java/com/baeldung/collectors/CollectorsUnitTest.java
@@ -0,0 +1,77 @@
+package com.baeldung.collectors;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Objects;
+
+import org.junit.Test;
+
+import static java.util.stream.Collectors.maxBy;
+import static java.util.stream.Collectors.minBy;
+import static java.util.stream.Collectors.teeing;
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Unit tests for collectors additions in Java 12.
+ */
+public class CollectorsUnitTest {
+
+ @Test
+ public void whenTeeing_ItShouldCombineTheResultsAsExpected() {
+ List numbers = Arrays.asList(42, 4, 2, 24);
+ Range range = numbers.stream()
+ .collect(teeing(
+ minBy(Integer::compareTo),
+ maxBy(Integer::compareTo),
+ (min, max) -> new Range(min.orElse(null), max.orElse(null))
+ ));
+
+ assertThat(range).isEqualTo(new Range(2, 42));
+ }
+
+ /**
+ * Represents a closed range of numbers between {@link #min} and
+ * {@link #max}, both inclusive.
+ */
+ private static class Range {
+
+ private final Integer min;
+
+ private final Integer max;
+
+ Range(Integer min, Integer max) {
+ this.min = min;
+ this.max = max;
+ }
+
+ Integer getMin() {
+ return min;
+ }
+
+ Integer getMax() {
+ return max;
+ }
+
+ @Override
+ public boolean equals(Object o) {
+ if (this == o) return true;
+ if (o == null || getClass() != o.getClass()) return false;
+ Range range = (Range) o;
+ return Objects.equals(getMin(), range.getMin()) &&
+ Objects.equals(getMax(), range.getMax());
+ }
+
+ @Override
+ public int hashCode() {
+ return Objects.hash(getMin(), getMax());
+ }
+
+ @Override
+ public String toString() {
+ return "Range{" +
+ "min=" + min +
+ ", max=" + max +
+ '}';
+ }
+ }
+}
diff --git a/pom.xml b/pom.xml
index bf225d82f0..d97c30ad64 100644
--- a/pom.xml
+++ b/pom.xml
@@ -377,6 +377,7 @@
core-groovy
+
core-java-8