added convert to mobile sequence and Reverse Words

Author: neeraj-a2912

Strings/ConvertToMobileSequence.java

@@ -0,0 +1,25 @@
+package Strings;
+
+public class ConvertToMobileSequence {
+
+    String printSequence(String S) 
+    { 
+        // code here
+        String[] nums = { "2", "22", "222", "3", "33", "333", "4", "44", "444", "5", "55", "555",
+                        "6", "66", "666", "7", "77", "777","7777", "8", "88", "888", "9", "99", "999", "9999" };
+        
+        String ans = "";
+        for(int i=0; i<S.length(); i++){
+            if(S.charAt(i)==' '){
+                ans += 0;
+            }else{
+                int j = S.charAt(i) - 'A';
+                ans += nums[j];
+            }
+        }
+        return ans;
+    }
+    public static void main(String[] args) {
+        // take user input accordingly
+    }
+}

Strings/ReverseWords.java

@@ -0,0 +1,27 @@
+package Strings;
+
+import java.util.Stack;
+
+public class ReverseWords {
+    public static String reverseWords(String S)
+    {
+        // code here 
+        Stack<String> st = new Stack<>();
+        
+        for(String word : S.split("\\.")){
+            st.push(word);
+        }
+        
+        String s ="";
+        while(!st.isEmpty()){
+            s += st.pop();
+            if(!st.isEmpty()){
+                s+=".";
+            }
+        }
+        return s;
+    }
+    public static void main(String[] args) {
+        // take inputs accordingly
+    }
+}