added java 8 streams

Author: itsmrajesh

src/corejava/java8/streams/StreamsDemo.java

@@ -0,0 +1,41 @@
+package corejava.java8.streams;
+
+import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class StreamsDemo {
+
+	public static void main(String[] args) {
+		List<Integer> l1 = new ArrayList<>();
+
+		for (int i = 0; i <= 10; i++) {
+			l1.add(i);
+		}
+
+		System.out.println(l1);
+
+		
+
+		List<Integer> l2 = l1.stream().filter(i -> i % 2 == 0).collect(Collectors.toList());
+
+		System.out.println(l2);
+
+		long count = l1.stream().filter(i -> i % 2 == 0).count();
+		System.out.println("Number of even numbers are: " + count);
+
+		Comparator<Integer> comp = (i1, i2) -> i1.compareTo(i2);
+
+		List<Integer> l3 = l1.stream().sorted(comp).collect(Collectors.toList());
+		System.out.println(l3);
+
+		Integer max = l1.stream().max(comp).get();
+		System.out.println(max);
+		Integer min = l1.stream().min(comp).get();
+		System.out.println(min);
+
+		l1.stream().forEach(i -> System.out.println(i));
+	}
+
+}

src/corejava/java8/streams/UpperToLowerCase.java

@@ -0,0 +1,24 @@
+package corejava.java8.streams;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class UpperToLowerCase {
+
+	public static void main(String[] args) {
+
+		List<String> l1 = new ArrayList<>();
+		l1.add("JOHN");
+		l1.add("BHARATH");
+		l1.add("JIM");
+		
+		System.out.println(l1);
+		
+		List<String> l2 = l1.stream().map(s->s.toLowerCase()).collect(Collectors.toList());
+		
+		System.out.println(l2);
+
+	}
+
+}