Added new stream question for Extracting unique matching strings from string array

README.md

@@ -130,3 +130,9 @@ This repository contains sample Java 8 coding questions that can be used for int
 32. **Calculate the age of a person in years**
 
     Write a Java 8 program to calculate the age of a person in years given their birthday.
+
+33. **Extract unique matching strings from String array**
+
+    Write a Java 8 program to extract Unique String starting with "#" from the String array Using Java Streams.
+
+

src/com/rohit/Sample.java

@@ -4,6 +4,7 @@
 import java.time.Period;
 import java.util.*;
 import java.util.function.Function;
+import java.util.stream.Collectors;
 import java.util.stream.IntStream;
 import java.util.stream.Stream;
 
@@ -249,6 +250,13 @@ public static void main(String[] args) {
          * Write a Java 8 program to calculate the age of a person in years given their birthday.
          */
         calculatePersonAgeInYear();
+
+        /**
+         * Extract unique matching strings from String array
+         * 
+         * Write a Java 8 program to extract Unique String starting with "#" from the String array Using Java Streams 
+         */
+        extractUniqueStringStartingWithHashtag();
     }
 
     private static void calculatePersonAgeInYear() {
@@ -607,4 +615,19 @@ private static void separationOfEvenOddNumberInMap() {
 
         System.out.println(evenAddOddSeparation);
     }
-}
+
+    private static void extractUniqueStringStartingWithHashtag() {
+	       String[] input = new String[]{
+	                "This JEP is #mainly for scientific #applications",
+	                "and it makes #floating-point operations consistently #strict.",
+	                "The default #floating-point operations are #strict or strictfp,"
+	        };
+
+	       List<String> output = Arrays.stream(input).flatMap(line -> Arrays.stream(line.split(" ")))
+						       					   	 .filter(word -> word.startsWith("#"))
+						       					   	 .map(str ->  "#" + str.substring(1).replaceAll("^\\W+|\\W+$", ""))
+						       					   	 .distinct()
+						       					   	 .collect(Collectors.toList());
+	       output.forEach(System.out::println);
+	}
+}