diff --git a/src/main/java/com/epam/izh/rd/online/repository/SimpleFileRepository.java b/src/main/java/com/epam/izh/rd/online/repository/SimpleFileRepository.java
index 1783b845..80219433 100644
--- a/src/main/java/com/epam/izh/rd/online/repository/SimpleFileRepository.java
+++ b/src/main/java/com/epam/izh/rd/online/repository/SimpleFileRepository.java
@@ -1,5 +1,16 @@
 package com.epam.izh.rd.online.repository;
 
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
+import java.net.URL;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Arrays;
+import java.util.Objects;
+
 public class SimpleFileRepository implements FileRepository {
 
     /**
@@ -10,7 +21,18 @@ public class SimpleFileRepository implements FileRepository {
      */
     @Override
     public long countFilesInDirectory(String path) {
-        return 0;
+        URL resource = getClass().getClassLoader().getResource(path);
+        File dir = new File(resource.getFile());
+        if (!dir.exists()) return 0L;
+        if (dir.isFile()) return 1L;
+        if (dir.isDirectory()) {
+            File[] dirs = dir.listFiles();
+            if (dirs == null || dirs.length == 0) return 0L;
+            return Arrays.stream(dirs)
+                    .map(d -> countFilesInDirectory(path + "/" + d.getName()))
+                    .reduce(Long::sum).orElse(0L);
+        }
+        return 0L;
     }
 
     /**
@@ -21,7 +43,18 @@ public long countFilesInDirectory(String path) {
      */
     @Override
     public long countDirsInDirectory(String path) {
-        return 0;
+        URL resource = getClass().getClassLoader().getResource(path);
+        File dir = new File(resource.getFile());
+        if (!dir.exists()) return 0L;
+        if (dir.isFile()) return 0L;
+        if (dir.isDirectory()) {
+            File[] dirs = dir.listFiles();
+            if (dirs == null || dirs.length == 0) return 1L;
+            return Arrays.stream(dirs)
+                    .map(d -> countDirsInDirectory(path + "/" + d.getName()))
+                    .reduce(Long::sum).orElse(0L) + 1L;
+        }
+        return 0L;
     }
 
     /**
@@ -32,7 +65,23 @@ public long countDirsInDirectory(String path) {
      */
     @Override
     public void copyTXTFiles(String from, String to) {
-        return;
+        File fileFrom = new File(from);
+        File fileTo = new File(to);
+        Path pathFrom = Paths.get(fileFrom.getParent());
+        Path pathTo = Paths.get(fileTo.getParent());
+        try {
+            if (!Files.exists(pathTo)) {
+                Files.createDirectories(pathTo);
+            }
+            for (File item : Objects.requireNonNull(pathFrom.toFile().listFiles())) {
+                if (item.getAbsolutePath().endsWith(".txt")) {
+                    Files.copy(fileFrom.toPath(), fileTo.toPath());
+                }
+            }
+        }  catch (IOException ex) {
+            System.out.println(ex.getMessage());
+        }
+
     }
 
     /**
@@ -44,7 +93,17 @@ public void copyTXTFiles(String from, String to) {
      */
     @Override
     public boolean createFile(String path, String name) {
-        return false;
+        URL resource = getClass().getClassLoader().getResource("");
+        File dir = new File(resource.getFile() + "/" + path);
+        File file = new File(resource.getPath() + "/" + path, name);
+        try {
+            if (dir.mkdirs() || dir.exists()) {
+                file.createNewFile();
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        return file.exists();
     }
 
     /**
@@ -55,6 +114,15 @@ public boolean createFile(String path, String name) {
      */
     @Override
     public String readFileFromResources(String fileName) {
-        return null;
+        String pathFile = "./src/main/resources/" + fileName;
+        StringBuilder content = new StringBuilder();
+        try (BufferedReader bw = new BufferedReader(new FileReader(pathFile))) {
+            String buff = null;
+            while ((buff = bw.readLine()) != null) content.append(buff);
+        }
+        catch (IOException ex) {
+            System.out.println(ex.getMessage());
+        }
+        return content.toString();
     }
-}
+}
\ No newline at end of file
diff --git a/src/main/java/com/epam/izh/rd/online/service/SimpleBigNumbersService.java b/src/main/java/com/epam/izh/rd/online/service/SimpleBigNumbersService.java
index a94c7bba..dfd83525 100644
--- a/src/main/java/com/epam/izh/rd/online/service/SimpleBigNumbersService.java
+++ b/src/main/java/com/epam/izh/rd/online/service/SimpleBigNumbersService.java
@@ -2,6 +2,7 @@
 
 import java.math.BigDecimal;
 import java.math.BigInteger;
+import java.math.RoundingMode;
 
 public class SimpleBigNumbersService implements BigNumbersService {
 
@@ -13,7 +14,7 @@ public class SimpleBigNumbersService implements BigNumbersService {
      */
     @Override
     public BigDecimal getPrecisionNumber(int a, int b, int range) {
-        return null;
+        return new BigDecimal((double) a / b).setScale(range, RoundingMode.HALF_UP);
     }
 
     /**
@@ -22,8 +23,23 @@ public BigDecimal getPrecisionNumber(int a, int b, int range) {
      * @param range номер числа, считая с числа 2
      * @return простое число
      */
+    public static boolean isPrime(int number){
+        for(int i=2; i<number; i++){
+            if(number%i == 0){
+                return false;
+            }
+        }
+        return true;
+    }
+
     @Override
     public BigInteger getPrimaryNumber(int range) {
-        return null;
+        int i = 0, num = 2;
+        while (i <= range) {
+            if (isPrime(num++)) {
+                i++;
+            }
+        }
+        return BigInteger.valueOf(--num);
     }
-}
+}
\ No newline at end of file
diff --git a/src/main/java/com/epam/izh/rd/online/service/SimpleDateService.java b/src/main/java/com/epam/izh/rd/online/service/SimpleDateService.java
index 70d64dfd..c0b4f08f 100644
--- a/src/main/java/com/epam/izh/rd/online/service/SimpleDateService.java
+++ b/src/main/java/com/epam/izh/rd/online/service/SimpleDateService.java
@@ -2,6 +2,7 @@
 
 import java.time.LocalDate;
 import java.time.LocalDateTime;
+import java.time.Year;
 import java.time.format.DateTimeFormatter;
 
 public class SimpleDateService implements DateService {
@@ -14,7 +15,8 @@ public class SimpleDateService implements DateService {
      */
     @Override
     public String parseDate(LocalDate localDate) {
-        return null;
+        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd-MM-yyyy");
+        return localDate.format(formatter);
     }
 
     /**
@@ -25,7 +27,8 @@ public String parseDate(LocalDate localDate) {
      */
     @Override
     public LocalDateTime parseString(String string) {
-        return null;
+        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm");
+        return LocalDateTime.parse(string, formatter);
     }
 
     /**
@@ -37,7 +40,7 @@ public LocalDateTime parseString(String string) {
      */
     @Override
     public String convertToCustomFormat(LocalDate localDate, DateTimeFormatter formatter) {
-        return null;
+        return localDate.format(formatter);
     }
 
     /**
@@ -47,7 +50,15 @@ public String convertToCustomFormat(LocalDate localDate, DateTimeFormatter forma
      */
     @Override
     public long getNextLeapYear() {
-        return 0;
+        long year = LocalDate.now().getYear();
+        if (Year.isLeap(year)) return year;
+        else {
+            while(!Year.isLeap(year)) {
+                year = (year % 100 == 0 ? ++year : year + (year % 4));
+            }
+        }
+
+        return year;
     }
 
     /**
@@ -57,8 +68,9 @@ public long getNextLeapYear() {
      */
     @Override
     public long getSecondsInYear(int year) {
-        return 0;
+        return (long) LocalDate.of(year, 1, 1).lengthOfYear() * 24 * 3600;
+
     }
 
 
-}
+}
\ No newline at end of file
diff --git a/src/main/java/com/epam/izh/rd/online/service/SimpleRegExpService.java b/src/main/java/com/epam/izh/rd/online/service/SimpleRegExpService.java
index b6eff56b..9f157e60 100644
--- a/src/main/java/com/epam/izh/rd/online/service/SimpleRegExpService.java
+++ b/src/main/java/com/epam/izh/rd/online/service/SimpleRegExpService.java
@@ -1,5 +1,13 @@
 package com.epam.izh.rd.online.service;
 
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.Objects;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
 public class SimpleRegExpService implements RegExpService {
 
     /**
@@ -11,7 +19,24 @@ public class SimpleRegExpService implements RegExpService {
      */
     @Override
     public String maskSensitiveData() {
-        return null;
+        StringBuilder result = null;
+        try {
+            File file = new File("C:/Users/Roma/IdeaProjects/java-data-handling-template/src/main/resources/sensitive_data.txt");
+            FileReader fr = new FileReader(file);
+            BufferedReader reader = new BufferedReader(fr);
+
+            result = new StringBuilder(reader.readLine());
+            Pattern pattern = Pattern.compile("(\\d{4} ){4}");
+            Matcher matcher =  pattern.matcher(result);
+
+            while (matcher.find()) {
+                result.replace(matcher.start() + 5, matcher.end() - 5, "**** **** ");
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+
+        return Objects.requireNonNull(result).toString();
     }
 
     /**
@@ -22,6 +47,25 @@ public String maskSensitiveData() {
      */
     @Override
     public String replacePlaceholders(double paymentAmount, double balance) {
-        return null;
+        StringBuilder result = null;
+        try  {
+            File file = new File("C:/Users/Roma/IdeaProjects/java-data-handling-template/src/main/resources/sensitive_data.txt");
+            FileReader fr = new FileReader(file);
+            BufferedReader reader = new BufferedReader(fr);
+
+            result = new StringBuilder(reader.readLine());
+            Pattern pattern = Pattern.compile("(\\$\\{)payment_amount}");
+            Matcher matcher =  pattern.matcher(result);
+            if (!matcher.find()) throw new IOException();
+            result.replace(matcher.start(), matcher.end(), Integer.toString((int) paymentAmount));
+            pattern = Pattern.compile("(\\$\\{)balance}");
+            matcher =  pattern.matcher(result);
+            if (!matcher.find()) throw new IOException();
+            result.replace(matcher.start(), matcher.end(), Integer.toString((int) balance));
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+
+        return Objects.requireNonNull(result).toString();
     }
-}
+}
\ No newline at end of file
diff --git a/src/main/java/com/epam/izh/rd/online/service/SimpleTextService.java b/src/main/java/com/epam/izh/rd/online/service/SimpleTextService.java
index 68951fbe..561dfc6e 100644
--- a/src/main/java/com/epam/izh/rd/online/service/SimpleTextService.java
+++ b/src/main/java/com/epam/izh/rd/online/service/SimpleTextService.java
@@ -1,5 +1,7 @@
 package com.epam.izh.rd.online.service;
 
+import java.util.Locale;
+
 public class SimpleTextService implements TextService {
 
     /**
@@ -13,7 +15,7 @@ public class SimpleTextService implements TextService {
      */
     @Override
     public String removeString(String base, String remove) {
-        return null; //TODO
+        return base.replace(remove, ""); //TODO
     }
 
     /**
@@ -24,7 +26,7 @@ public String removeString(String base, String remove) {
      */
     @Override
     public boolean isQuestionString(String text) {
-        return false; //TODO
+        return text.lastIndexOf("?") == text.length() - 1 && text.length() != 0; //TODO
     }
 
     /**
@@ -35,7 +37,7 @@ public boolean isQuestionString(String text) {
      */
     @Override
     public String concatenate(String... elements) {
-        return null; //TODO
+        return String.join("", elements); //TODO
     }
 
     /**
@@ -47,8 +49,15 @@ public String concatenate(String... elements) {
      */
     @Override
     public String toJumpCase(String text) {
-        return null; //TODO
-    }
+        String result = "";
+        for (int i = 0; i < text.length() - 1;) {
+            result += text.substring(i, i + 1).toLowerCase();
+            result += text.substring(i + 1, i + 2).toUpperCase();
+            i += 2;
+        }
+        return result; //TODO
+
+    } //TODO
 
     /**
      * Метод определяет, является ли строка палиндромом.
@@ -59,6 +68,14 @@ public String toJumpCase(String text) {
      */
     @Override
     public boolean isPalindrome(String string) {
-       return false; //TODO
+        if (string.length() > 0) {
+            string = string.toLowerCase().replaceAll("\\s+", "");
+            String invertedString = "";
+            for (int i = 0; i < string.length(); i++) {
+                invertedString = string.charAt(i) + invertedString;
+            }
+            return string.equals(invertedString);
+        }
+        return false;
     }
-}
+}
\ No newline at end of file