created java file

Author: GouravRusiya30

Java/reverse-words-in-a-string.java

@@ -0,0 +1,39 @@
+/**
+* Reverse Words in a String
+* Medium
+* 
+* Given an input string, reverse the string word by word
+
+Example 1:
+
+Input: "the sky is blue"
+Output: "blue is sky the"
+
+Example 2:
+
+Input: "  hello world!  "
+Output: "world! hello"
+Explanation: Your reversed string should not contain leading or trailing spaces.
+* 
+* Runtime: 7 ms
+* Memory Usage: 41.8 MB
+*
+*/
+class Solution {
+    public String reverseWords(String s) {
+        s = s.trim();
+        
+        String [] strArr = s.split(" ");
+        
+        String ans = "";
+        
+        for (int i=strArr.length-1; i>=0; i--) {
+            if (strArr[i].isEmpty()){
+        		continue;
+        	}
+            ans += strArr[i].trim() + " ";
+        }
+        
+        return ans.trim();
+    }
+}