README.md

@@ -2,4 +2,7 @@
 
 Hello!
 
-Here are the materials required to complete the exercises of Part 4 - Object Properties and Data Structure.
\ No newline at end of file
+Here are the materials required to complete the exercises of Part 4 - Object Properties and Data Structure.
+
+
+**NOTE: requires jdk 21!**
\ No newline at end of file

exercise1/TestZipper.java

@@ -36,7 +36,7 @@ class TestZipper extends Zipper {
                                 Originally was fetched from %s.
                                 The founded file is %s.
                                 The file contains %d lines.
-                                The file contians %d words.
+                                The file contains %d words.
                                 Possible title of the work: %s
                                 
                                 """,