encode and decode strings solved

Author: mintheon

encode-and-decode-strings/mintheon.java

@@ -0,0 +1,39 @@
+import java.util.ArrayList;
+import java.util.List;
+
+public class Codec {
+  String SPLIT = ":";
+
+  // Encodes a list of strings to a single string.
+  public String encode(List<String> strs) {
+    StringBuilder encoded = new StringBuilder();
+
+    for(String str : strs) {
+      encoded.append(str.length()).append(SPLIT).append(str);
+    }
+
+    return encoded.toString();
+  }
+
+  // Decodes a single string to a list of strings.
+  public List<String> decode(String s) {
+    List<String> decoded = new ArrayList<>();
+
+    int pointer = 0;
+    while(pointer < s.length()) {
+      int index = s.indexOf(SPLIT, pointer);
+      int length = Integer.parseInt(s.substring(pointer, index));
+
+      String str = s.substring(index + 1, index + 1 + length);
+      decoded.add(str);
+
+      pointer = index + 1 + length;
+    }
+
+    return decoded;
+  }
+}
+
+// Your Codec object will be instantiated and called as such:
+// Codec codec = new Codec();
+// codec.decode(codec.encode(strs));