упорядочил папки с кодом.

src/Repository/ServerExchangeUnit_2021.java

@@ -0,0 +1,41 @@
+package Repository;
+import Common.Utils.Utils;
+
+import java.io.File;
+import java.io.Serializable;
+public class ServerExchangeUnit_2021 implements Serializable {
+    public String codeName;
+    public String arg;
+    public Serializable object;
+    //--------
+    public ServerExchangeUnit_2021(ServerCode code_in, String arg_in, Serializable object_in) {
+        codeName = code_in.toString();
+        arg = arg_in;
+        object = object_in;
+    }
+    public ServerExchangeUnit_2021(ServerCode code_in, String arg_in) {
+        codeName = code_in.toString();
+        arg = arg_in;
+        object = null;
+    }
+    public ServerExchangeUnit_2021(ServerCode code_in) {
+        codeName = code_in.toString();
+        arg = null;
+        object = null;
+    }
+    //--------
+    public ServerCode getCode() throws Exception {
+        return ServerCode.valueOf(codeName);
+    }
+    //--------
+    public void Unpack() throws Exception {
+        Utils.unpackFile((byte[]) object, new File(arg));
+    }
+    public void Unpack(File file) throws Exception {
+        Utils.unpackFile((byte[]) object, file);
+    }
+    public void Print() {
+        System.out.println("codeName=" + Utils.Brackets(codeName));
+        System.out.println(arg);
+    }
+}