added StreamDemo5 class

sauravpd · sauravpd · commit 62b904ef6452 · 2020-01-01T21:08:16.000+05:30
diff --git a/java8Tutorials/src/main/java/java8/stream/StreamDemo5.java b/java8Tutorials/src/main/java/java8/stream/StreamDemo5.java
@@ -0,0 +1,31 @@
+package java8.stream;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import java.util.stream.Stream;
+
+/**
+ * 
+ * @author saurav
+ *
+ */
+public class StreamDemo5 
+{
+	public static void main(String[] args) 
+	{
+		
+		Stream.of("a1", "aa", "a3")
+        .map(a->findInt(a))
+        .forEach(System.out::println);
+	}
+	
+	private static Integer findInt(String s)
+	{
+		Matcher m=Pattern.compile("[0-9]+").matcher(s);
+		if(m.find())
+		{
+			return Integer.parseInt(m.group());
+		}
+		return null;
+	}
+}
