Adding initial examples for streams

training/src/main/java/info/jab/fp/stream/StreamExamples.java

@@ -0,0 +1,39 @@
+package info.jab.fp.stream;
+
+import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.Gatherers;
+
+public class StreamExamples {
+
+    public void example1() {
+          var text = """
+                item1
+                item2
+                --
+                item11
+                item12
+                """;
+
+        var result = text.lines()
+        .gather(Gatherers.windowFixed(2))
+        .toList();
+    }
+
+    public void example2() {
+        var text = """
+            item1
+            item2
+            --
+            item11
+            item12
+            """;
+
+        var result = text.lines()
+            .gather(Gatherers.fold(() -> 0, (value, s) -> value + 1))
+            .findFirst().orElseThrow();
+
+        System.out.println(result);
+    }
+
+}