diff --git a/build.gradle b/build.gradle
new file mode 100644
index 0000000..63d620b
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,20 @@
+plugins {
+    id 'java'
+}
+
+group 'org.example'
+version '1.0-SNAPSHOT'
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    // https://mvnrepository.com/artifact/junit/junit
+    testImplementation group: 'junit', name: 'junit', version: '4.13.2'
+}
+
+test {
+    useJUnit()
+}
+
diff --git a/src/main/java/ru/sber/mironov/ClientType/ClientType.java b/src/main/java/ru/sber/mironov/ClientType/ClientType.java
new file mode 100644
index 0000000..3247a12
--- /dev/null
+++ b/src/main/java/ru/sber/mironov/ClientType/ClientType.java
@@ -0,0 +1,33 @@
+package ru.sber.mironov.ClientType;
+
+
+import ru.sber.mironov.Clients.Client;
+import ru.sber.mironov.Clients.HoldingClient;
+import ru.sber.mironov.Clients.IndividualClient;
+import ru.sber.mironov.Clients.LegalEntityClient;
+import ru.sber.mironov.MyJsonLibrary.MyJsonObject;
+
+
+import java.util.HashMap;
+import java.util.List;
+
+public enum ClientType {
+    INDIVIDUAL {
+        public Client createClient(MyJsonObject client) {
+            return new IndividualClient(client);
+        }
+    },
+    LEGAL_ENTITY {
+        public Client createClient(MyJsonObject client) {
+            return new LegalEntityClient(client);
+        }
+    },
+    HOLDING {
+        public Client createClient(MyJsonObject client) {
+            return new HoldingClient(client);
+        }
+    };
+
+    public abstract Client createClient(MyJsonObject client);
+}
+
diff --git a/src/main/java/ru/sber/mironov/Clients/Client.java b/src/main/java/ru/sber/mironov/Clients/Client.java
new file mode 100644
index 0000000..a3c002f
--- /dev/null
+++ b/src/main/java/ru/sber/mironov/Clients/Client.java
@@ -0,0 +1,40 @@
+package ru.sber.mironov.Clients;
+
+import ru.sber.mironov.ClientType.ClientType;
+import ru.sber.mironov.MyJsonLibrary.MyJsonObject;
+
+import java.util.HashMap;
+
+public class Client {
+    private final String name;
+    private final String inn;
+    private final ClientType type;
+
+    public Client(String name, String inn, ClientType type) {
+        this.name = name;
+        this.inn = inn;
+        this.type = type;
+    }
+
+    public Client(MyJsonObject client) {
+        this.name = (String) client.getString("name");
+        this.inn = (String) client.getString("inn");
+        this.type = ClientType.valueOf(client.getString("ClientType"));
+    }
+
+    public String toString() {
+        return name.toString() + " " + inn.toString() + " " + type;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public String getInn() {
+        return inn;
+    }
+
+    public ClientType getType() {
+        return type;
+    }
+}
diff --git a/src/main/java/ru/sber/mironov/Clients/HoldingClient.java b/src/main/java/ru/sber/mironov/Clients/HoldingClient.java
new file mode 100644
index 0000000..3c34785
--- /dev/null
+++ b/src/main/java/ru/sber/mironov/Clients/HoldingClient.java
@@ -0,0 +1,17 @@
+package ru.sber.mironov.Clients;
+
+
+import ru.sber.mironov.MyJsonLibrary.MyJsonObject;
+
+public class HoldingClient extends Client {
+    private final double level;
+
+    public HoldingClient(MyJsonObject client) {
+        super(client);
+        level = Double.parseDouble(client.getString("level"));
+    }
+
+    public double getLevel() {
+        return level;
+    }
+}
diff --git a/src/main/java/ru/sber/mironov/Clients/IndividualClient.java b/src/main/java/ru/sber/mironov/Clients/IndividualClient.java
new file mode 100644
index 0000000..02089b1
--- /dev/null
+++ b/src/main/java/ru/sber/mironov/Clients/IndividualClient.java
@@ -0,0 +1,26 @@
+package ru.sber.mironov.Clients;
+
+
+import ru.sber.mironov.ClientType.ClientType;
+import ru.sber.mironov.MyJsonLibrary.MyJsonObject;
+
+
+import java.util.HashMap;
+
+public class IndividualClient extends Client {
+    private final int salary;
+
+    public IndividualClient(String name, String inn, ClientType type, int salary) {
+        super(name, inn, type);
+        this.salary = salary;
+    }
+
+    public IndividualClient(MyJsonObject client) {
+        super(client);
+        this.salary = Integer.parseInt(client.getString("salary"));
+    }
+
+    public int getSalary() {
+        return salary;
+    }
+}
diff --git a/src/main/java/ru/sber/mironov/Clients/LegalEntityClient.java b/src/main/java/ru/sber/mironov/Clients/LegalEntityClient.java
new file mode 100644
index 0000000..3a2f3d5
--- /dev/null
+++ b/src/main/java/ru/sber/mironov/Clients/LegalEntityClient.java
@@ -0,0 +1,24 @@
+package ru.sber.mironov.Clients;
+
+
+import ru.sber.mironov.ClientType.ClientType;
+import ru.sber.mironov.MyJsonLibrary.MyJsonObject;
+
+public class LegalEntityClient extends Client {
+
+    private final Boolean realLegal;
+
+    public LegalEntityClient(String name, String inn, ClientType type, Boolean realLegal) {
+        super(name, inn, type);
+        this.realLegal = realLegal;
+    }
+
+    public LegalEntityClient(MyJsonObject client) {
+        super(client);
+        realLegal = Boolean.parseBoolean(client.getString("realLegsl"));
+    }
+
+    public Boolean getRealLegal() {
+        return realLegal;
+    }
+}
diff --git a/src/main/java/ru/sber/mironov/ClientsJsonParser/ClientsJsonParser.java b/src/main/java/ru/sber/mironov/ClientsJsonParser/ClientsJsonParser.java
new file mode 100644
index 0000000..f49e8f5
--- /dev/null
+++ b/src/main/java/ru/sber/mironov/ClientsJsonParser/ClientsJsonParser.java
@@ -0,0 +1,35 @@
+package ru.sber.mironov.ClientsJsonParser;
+
+
+import ru.sber.mironov.ClientType.ClientType;
+import ru.sber.mironov.Clients.Client;
+import ru.sber.mironov.MyJsonLibrary.MyJsonArray;
+
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.ArrayList;
+
+public class ClientsJsonParser {
+    public static ArrayList<Client> parseClientsJson(String filePath) throws IOException {
+        StringBuilder fileData = new StringBuilder();
+
+        try (BufferedReader reader = new BufferedReader(new FileReader(filePath))) {
+            char[] buf = new char[1024];
+            int numRead;
+            while ((numRead = reader.read(buf)) != -1) {
+                String readData = String.valueOf(buf, 0, numRead);
+                fileData.append(readData);
+            }
+        }
+        String content = fileData.toString();
+        MyJsonArray clients = new MyJsonArray(content);
+
+        ArrayList<Client> people = new ArrayList<>();
+        for (var o : clients) {
+            ClientType ct = ClientType.valueOf(o.getString("ClientType"));
+            people.add(ct.createClient(o));
+        }
+        return people;
+    }
+}
diff --git a/src/main/java/ru/sber/mironov/Main.java b/src/main/java/ru/sber/mironov/Main.java
new file mode 100644
index 0000000..072d0cb
--- /dev/null
+++ b/src/main/java/ru/sber/mironov/Main.java
@@ -0,0 +1,51 @@
+package ru.sber.mironov;
+
+import ru.sber.mironov.ClientsJsonParser.ClientsJsonParser;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class Main {
+    public static void main(String[] args) throws IOException {
+        /*String[] a = {"1", "2", "3"};
+        ArrayList<String> q = new ArrayList<>(List.of(a));*/
+        String fileName = "src/main/resources/Clients.json";
+        System.out.println(ClientsJsonParser.parseClientsJson(fileName));
+
+        /*String s = "[\n" +
+                "  {\n" +
+                "    \"ClientType\": \"INDIVIDUAL\",\n" +
+                "    \"inn\": \"1688\",\n" +
+                "    \"name\": \"Alex\",\n" +
+                "    \"salary\": \"100\"\n" +
+                "  },\n" +
+                "  {\n" +
+                "    \"ClientType\": \"LEGAL_ENTITY\",\n" +
+                "    \"name\": \"Vadim\",\n" +
+                "    \"inn\": \"1432\"\n" +
+                "  },\n" +
+                "  {\n" +
+                "    \"ClientType\": \"HOLDING\",\n" +
+                "    \"name\": \"Gera\",\n" +
+                "    \"inn\": \"2001\"\n" +
+                "  }\n" +
+                "]";
+        String str = "{ { { {";
+        Pattern p = Pattern.compile("\\{(\\s.+)+?}");
+        Matcher m = p.matcher(s);
+        while (m.find()) {
+            System.out.println(s.substring(m.start(), m.end()));
+        }*/
+        /*var people = ClientsJsonParser.parseClientsJson((args[0]));
+        System.out.println(people);*/
+
+
+
+
+    }
+}
+
+
diff --git a/src/main/java/ru/sber/mironov/MyJsonLibrary/MyJsonArray.java b/src/main/java/ru/sber/mironov/MyJsonLibrary/MyJsonArray.java
new file mode 100644
index 0000000..ce728a7
--- /dev/null
+++ b/src/main/java/ru/sber/mironov/MyJsonLibrary/MyJsonArray.java
@@ -0,0 +1,46 @@
+package ru.sber.mironov.MyJsonLibrary;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Iterator;
+import java.util.List;
+import java.util.function.Consumer;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class MyJsonArray implements Iterable<MyJsonObject> {
+    ArrayList<MyJsonObject> jsonObjects;
+
+    public MyJsonArray(String content) {
+        ArrayList<MyJsonObject> clients = new ArrayList<>();
+        for (var x : getSubstrings(content)) {
+            clients.add(new MyJsonObject(content.substring(x.get(0), x.get(1))));
+        }
+        jsonObjects = clients;
+    }
+
+    @Override
+    public Iterator<MyJsonObject> iterator() {
+        return jsonObjects.iterator();
+    }
+
+    @Override
+    public void forEach(Consumer<? super MyJsonObject> action) {
+        jsonObjects.forEach(action);
+    }
+
+    private ArrayList<ArrayList<Integer>> getSubstrings(String content) {
+        ArrayList<ArrayList<Integer>> res = new ArrayList<>();
+        int prev = 0;
+        int now = 0;
+        for (int i = 0; i < content.length(); i++) {
+            if (content.charAt(i) == '{') {
+                prev = i;
+            } else if (content.charAt(i) == '}') {
+                now = i + 1;
+                res.add(new ArrayList<>(List.of(prev, now)));
+            }
+        }
+        return res;
+    }
+}
diff --git a/src/main/java/ru/sber/mironov/MyJsonLibrary/MyJsonObject.java b/src/main/java/ru/sber/mironov/MyJsonLibrary/MyJsonObject.java
new file mode 100644
index 0000000..4ffac9a
--- /dev/null
+++ b/src/main/java/ru/sber/mironov/MyJsonLibrary/MyJsonObject.java
@@ -0,0 +1,34 @@
+package ru.sber.mironov.MyJsonLibrary;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class MyJsonObject {
+    private final Map<String, String> map;
+
+    public MyJsonObject(Map<String, String> map) {
+        this.map = map;
+    }
+
+    public MyJsonObject(String str) {
+        Map<String, String> newMap = new HashMap<>();
+        String[] strings = str.split(",");
+        for (var s : strings) {
+            String[] splitString = s.replace("\s", "")
+                    .replace("{", "")
+                    .replace("}", "")
+                    .replace("\"", "")
+                    .replace(",", "")
+                    .replaceAll("[ \\f\\n\\r\\t\\v]", "")
+                    .split(":");
+            newMap.put(splitString[0], splitString[1]);
+        }
+        map = newMap;
+    }
+
+    public String getString(String key) {
+        return map.get(key);
+    }
+}
diff --git a/src/main/resources/Clients.json b/src/main/resources/Clients.json
new file mode 100644
index 0000000..388f389
--- /dev/null
+++ b/src/main/resources/Clients.json
@@ -0,0 +1,20 @@
+[
+  {
+    "ClientType": "INDIVIDUAL",
+    "inn": "1688",
+    "name": "Alex",
+    "salary": 100
+  },
+  {
+    "ClientType": "LEGAL_ENTITY",
+    "name": "Vadim",
+    "inn": "1432",
+    "realLegal": false
+  },
+  {
+    "ClientType": "HOLDING",
+    "name": "Gera",
+    "inn": "2001",
+    "level": 34.5
+  }
+]
\ No newline at end of file
diff --git a/src/test/java/ru/sber/mironov/ClientsJsonParser/ClientsJsonParserTest.java b/src/test/java/ru/sber/mironov/ClientsJsonParser/ClientsJsonParserTest.java
new file mode 100644
index 0000000..37226af
--- /dev/null
+++ b/src/test/java/ru/sber/mironov/ClientsJsonParser/ClientsJsonParserTest.java
@@ -0,0 +1,41 @@
+package ru.sber.mironov.ClientsJsonParser;
+
+import org.junit.After;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+import ru.sber.mironov.ClientType.ClientType;
+import ru.sber.mironov.Clients.Client;
+import ru.sber.mironov.Clients.HoldingClient;
+import ru.sber.mironov.Clients.IndividualClient;
+import ru.sber.mironov.Clients.LegalEntityClient;
+
+import java.io.IOException;
+import java.util.ArrayList;
+
+
+public class ClientsJsonParserTest {
+    private ArrayList<Client> people;
+
+    @Before
+    public void setUpPeople() throws IOException {
+        String fileName = "src/test/resources/Clients.json";
+
+        people = ClientsJsonParser.parseClientsJson(fileName);
+    }
+
+    @After
+    public void tearDown() {
+        people.clear();
+    }
+
+    @Test
+    public void parseClientsJson() {
+        Assert.assertEquals(this.people.get(0).getName(), "Alex");
+        Assert.assertEquals(this.people.get(0).getInn(), "1688");
+        Assert.assertEquals(this.people.get(0).getType(), ClientType.INDIVIDUAL);
+        Assert.assertEquals(((IndividualClient) people.get(0)).getSalary(), 100);
+        Assert.assertEquals(((LegalEntityClient) people.get(1)).getRealLegal(), false);
+        assert (((HoldingClient) people.get(2)).getLevel() == 34.5);
+    }
+}
\ No newline at end of file
diff --git a/src/test/resources/Clients.json b/src/test/resources/Clients.json
new file mode 100644
index 0000000..388f389
--- /dev/null
+++ b/src/test/resources/Clients.json
@@ -0,0 +1,20 @@
+[
+  {
+    "ClientType": "INDIVIDUAL",
+    "inn": "1688",
+    "name": "Alex",
+    "salary": 100
+  },
+  {
+    "ClientType": "LEGAL_ENTITY",
+    "name": "Vadim",
+    "inn": "1432",
+    "realLegal": false
+  },
+  {
+    "ClientType": "HOLDING",
+    "name": "Gera",
+    "inn": "2001",
+    "level": 34.5
+  }
+]
\ No newline at end of file