diff --git a/src/app/Artifacts.java b/src/app/Artifacts.java
index 5d5e863..d9c258e 100644
--- a/src/app/Artifacts.java
+++ b/src/app/Artifacts.java
@@ -4,11 +4,11 @@ import java.io.File;
 
 public class Artifacts {
 
-    Tools tools = new Tools();
+    private Tools tools = new Tools();
 
     /**
-     * @param file
-     * @return
+     * @param file <i>File</i>
+     * @return file with md5 field
      */
     public MFile getMFile(File file) {
         MFile mfile = new MFile();
diff --git a/src/app/Controller.java b/src/app/Controller.java
index 701a422..ec31b42 100644
--- a/src/app/Controller.java
+++ b/src/app/Controller.java
@@ -1,10 +1,8 @@
 package app;
 
-import javafx.beans.property.StringProperty;
 import javafx.concurrent.Task;
 import javafx.fxml.FXML;
 import javafx.scene.control.*;
-import javafx.scene.control.cell.PropertyValueFactory;
 import javafx.scene.text.Text;
 
 
@@ -55,7 +53,7 @@ public class Controller {
 
         Task<Void> loadDirTask = new Task<Void>() {
             @Override
-            public Void call() throws Exception {
+            public Void call() {
 
                 loadDirState.setText("");
                 calcMd5State.setText("");
@@ -103,7 +101,7 @@ public class Controller {
 
         Task<Void> delDoubleTask = new Task<Void>() {
             @Override
-            public Void call() throws Exception {
+            public Void call()  {
 
                 for (int i = 0; i < doubles.size(); i++) {
                     new Execute().execute(new String[]{"rm", doubles.get(i).file.getAbsolutePath()});
diff --git a/src/app/Main.java b/src/app/Main.java
index 866edbb..0088ff6 100644
--- a/src/app/Main.java
+++ b/src/app/Main.java
@@ -2,12 +2,8 @@ package app;
 
 import javafx.application.Application;
 import javafx.fxml.FXMLLoader;
-import javafx.geometry.Insets;
 import javafx.scene.Parent;
 import javafx.scene.Scene;
-import javafx.scene.control.Button;
-import javafx.scene.control.TextField;
-import javafx.scene.layout.GridPane;
 import javafx.stage.Stage;
 
 
diff --git a/src/app/QuicksortMd5.java b/src/app/QuicksortMd5.java
index dd338ab..44491fe 100644
--- a/src/app/QuicksortMd5.java
+++ b/src/app/QuicksortMd5.java
@@ -4,7 +4,7 @@ import app.Artifacts.MFile;
 
 import java.util.Map;
 
-public class QuicksortMd5 {
+class QuicksortMd5 {
     private Map<Integer, MFile> md5Pool;
     private int i;
     private int j;
diff --git a/src/app/Routines.java b/src/app/Routines.java
index 21c6614..77a2c50 100644
--- a/src/app/Routines.java
+++ b/src/app/Routines.java
@@ -10,15 +10,13 @@ import java.util.Map;
 
 import app.Artifacts.MFile;
 
-public class Routines {
+class Routines {
 
-    Execute x;
-    Tools tools;
+    private final Execute x;
 
 
     public Routines() {
         this.x = new Execute();
-        this.tools = new Tools();
     }
 
 
@@ -43,10 +41,10 @@ public class Routines {
             e.printStackTrace();
         }
         // [3]
-        Map<Integer, File> filepool = new HashMap<Integer, File>();
+        Map<Integer, File> filepool = new HashMap<>();
         int j = 0;
-        for (int i = 0; i < lines.size(); i++) {
-            File file = new File(lines.get(i));
+        for (String line : lines) {
+            File file = new File(line);
             if (type == "dir" && file.isDirectory() || type == "file" && file.isFile()) {
                 filepool.put(j, file);
                 j++;
diff --git a/src/app/Tools.java b/src/app/Tools.java
index d9b076d..bde8c67 100644
--- a/src/app/Tools.java
+++ b/src/app/Tools.java
@@ -3,9 +3,9 @@ package app;
 import java.io.BufferedReader;
 import java.io.IOException;
 
-public class Tools {
+class Tools {
 
-    Execute x;
+    private final Execute x;
 
     public Tools() {
         x = new Execute();
diff --git a/src/app/Write.java b/src/app/Write.java
index 1ac81cc..ea7cad1 100644
--- a/src/app/Write.java
+++ b/src/app/Write.java
@@ -7,7 +7,7 @@ import java.util.Map;
 
 import app.Artifacts.MFile;
 
-public class Write {
+class Write {
 
     /**
      * Write <b>text</b> to file at <b>path</b> .
diff --git a/src/app/layout.fxml b/src/app/layout.fxml
index bba9d9f..b6217ff 100644
--- a/src/app/layout.fxml
+++ b/src/app/layout.fxml
@@ -1,11 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
-<?import java.lang.*?>
-<?import java.util.*?>
-<?import javafx.scene.*?>
+
 <?import javafx.scene.control.*?>
 <?import javafx.scene.layout.*?>
-<?import java.net.*?>
 <?import javafx.geometry.*?>
 <?import javafx.scene.control.*?>
 <?import javafx.scene.layout.*?>
@@ -38,7 +35,6 @@
     />
 
     <Text   fx:id="loadDirState"
-            text=""
             GridPane.rowIndex="1"
             GridPane.columnIndex="1"
     />
@@ -50,7 +46,6 @@
     />
 
     <Text   fx:id="calcMd5State"
-            text=""
             GridPane.rowIndex="2"
             GridPane.columnIndex="1"
     />
@@ -62,7 +57,6 @@
     />
 
     <Text   fx:id="sortFileState"
-            text=""
             GridPane.rowIndex="3"
             GridPane.columnIndex="1"
     />
@@ -74,7 +68,6 @@
     />
 
     <Text   fx:id="findDoubleState"
-            text=""
             GridPane.rowIndex="4"
             GridPane.columnIndex="1"
     />
@@ -86,7 +79,6 @@
     />
 
     <Text   fx:id="delDoubleState"
-            text=""
             GridPane.rowIndex="5"
             GridPane.columnIndex="1"
     />