diff --git a/front/index.html b/front/index.html
index d110546..84be708 100644
--- a/front/index.html
+++ b/front/index.html
@@ -30,7 +30,10 @@
             <input id="second" class="form-control" type='number' value='0' />
         </div>
         <div>
-            <button type="button" class="btn btn-primary" id="calculate">Тык</button>
+            <button type="button" class="btn btn-primary my-2" id="calculate">Числа</button>
+        </div>
+        <div>
+            <button type="button" class="btn btn-primary mb-2" id="calculateStr">Строки</button>
         </div>
         <div>
             Результат:
diff --git a/front/script.js b/front/script.js
index e7a11c1..cfc600d 100644
--- a/front/script.js
+++ b/front/script.js
@@ -1,26 +1,30 @@
 const calculateButton = document.getElementById("calculate");
+const calculateStrButton = document.getElementById("calculateStr");
 const first = document.getElementById("first");
 const second = document.getElementById("second");
 const select = document.getElementById("operation");
 const result = document.getElementById("result");
 
 calculateButton.onclick = function() {
-    calculate();
+    calculate("num");
+};
+calculateStrButton.onclick = function() {
+    calculate("str");
 };
 
-function calculate() {
+function calculate(parametr) {
     switch (parseInt(select.value)) {
         case 1:
-            doSmth("plus")
+            doSmth("plus", parametr)
             break;
         case 2:
-            doSmth("minus")
+            doSmth("minus", parametr)
             break;
         case 3:
-            doSmth("mult")
+            doSmth("mult", parametr)
             break;
         case 4:
-            doSmth("div")
+            doSmth("div", parametr)
             break;
     };
 }
@@ -32,8 +36,9 @@ function checkNum(res) {
         return res
 }
 
-function doSmth(address) {
-    fetch(`http://localhost:8080/${address}?first=${first.value}&second=${second.value}`)
+function doSmth(address, type) {
+    console.log("Тип " + type)
+    fetch(`http://localhost:8080/${address}?first=${first.value}&second=${second.value}&type=${type}`)
         .then(response => response.text())
         .then(res => result.innerHTML = checkNum(res));
 }
\ No newline at end of file
diff --git a/src/main/java/com/labwork1/app/AppApplication.java b/src/main/java/com/labwork1/app/AppApplication.java
index 2203f45..d5d2762 100644
--- a/src/main/java/com/labwork1/app/AppApplication.java
+++ b/src/main/java/com/labwork1/app/AppApplication.java
@@ -12,7 +12,7 @@ public class AppApplication {
 	public static void main(String[] args) {
 		SpringApplication.run(AppApplication.class, args);
 	}
-	@GetMapping("/hello")
+	/*@GetMapping("/hello")
 	public String hello(@RequestParam(value = "name", defaultValue = "World") String name) {
 		return String.format("Hello %s!", name);
 	}
@@ -39,5 +39,5 @@ public class AppApplication {
 			return null;
 		}
 		return Double.toString(first/second);
-	}
+	}*/
 }
diff --git a/src/main/java/com/labwork1/app/calc/controller/CalcController.java b/src/main/java/com/labwork1/app/calc/controller/CalcController.java
new file mode 100644
index 0000000..0ad5ae4
--- /dev/null
+++ b/src/main/java/com/labwork1/app/calc/controller/CalcController.java
@@ -0,0 +1,44 @@
+package com.labwork1.app.calc.controller;
+
+import com.labwork1.app.calc.service.CalcService;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class CalcController {
+    private final CalcService calcService;
+
+    public CalcController(CalcService calcService) {
+        this.calcService = calcService;
+    }
+
+    @GetMapping("/plus")
+    public String plus(@RequestParam(required = false, defaultValue = "0") Object first,
+                       @RequestParam(required = false, defaultValue = "0") Object second,
+                       @RequestParam(required = false, defaultValue = "num") String type) {
+        return calcService.plus((Object) first, (Object) second, type);
+    }
+    @GetMapping("/minus")
+    public String minus(@RequestParam(required = false, defaultValue = "0") Object first,
+                        @RequestParam(required = false, defaultValue = "0") Object second,
+                        @RequestParam(required = false, defaultValue = "num") String type) {
+        return calcService.minus((Object) first, (Object) second, type);
+    }
+    @GetMapping("/mult")
+    public String mult(@RequestParam(required = false, defaultValue = "1") Object first,
+                        @RequestParam(required = false, defaultValue = "1") Object second,
+                        @RequestParam(required = false, defaultValue = "num") String type) {
+        return calcService.mult((Object) first, (Object) second, type);
+    }
+    @GetMapping("/div")
+    public String div(@RequestParam(required = false, defaultValue = "1") Object first,
+                        @RequestParam(required = false, defaultValue = "1") Object second,
+                        @RequestParam(required = false, defaultValue = "num") String type) {
+        if(Integer.parseInt(second.toString()) == 0)
+        {
+            return null;
+        }
+        return calcService.div((Object) first, (Object) second, type);
+    }
+}
diff --git a/src/main/java/com/labwork1/app/calc/domain/CalcNum.java b/src/main/java/com/labwork1/app/calc/domain/CalcNum.java
new file mode 100644
index 0000000..b7b90ac
--- /dev/null
+++ b/src/main/java/com/labwork1/app/calc/domain/CalcNum.java
@@ -0,0 +1,46 @@
+package com.labwork1.app.calc.domain;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.DisposableBean;
+import org.springframework.beans.factory.InitializingBean;
+import org.springframework.stereotype.Component;
+
+@Component(value = "num")
+public class CalcNum implements ICalc<Integer>, InitializingBean, DisposableBean {
+    private final Logger log = LoggerFactory.getLogger(CalcNum.class);
+
+    @Override
+    public void afterPropertiesSet() {
+        log.info("CalcNum.afterPropertiesSet()");
+    }
+
+    @Override
+    public void destroy() {
+        log.info("CalcNum.destroy()");
+    }
+
+    @Override
+    public Integer Plus(Integer first, Integer second) {
+        return first + second;
+    }
+
+    @Override
+    public Integer Mult(Integer first, Integer second) {
+        return first * second;
+    }
+
+    @Override
+    public Integer Minus(Integer first, Integer second) {
+        return first - second;
+    }
+
+    @Override
+    public Integer Div(Integer first, Integer second) {
+        if (second == 0){
+            return null;
+        }else{
+            return first / second;
+        }
+    }
+}
diff --git a/src/main/java/com/labwork1/app/calc/domain/CalcStr.java b/src/main/java/com/labwork1/app/calc/domain/CalcStr.java
new file mode 100644
index 0000000..ac5aa4a
--- /dev/null
+++ b/src/main/java/com/labwork1/app/calc/domain/CalcStr.java
@@ -0,0 +1,46 @@
+package com.labwork1.app.calc.domain;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.DisposableBean;
+import org.springframework.beans.factory.InitializingBean;
+import org.springframework.stereotype.Component;
+
+@Component(value = "str")
+public class CalcStr implements ICalc<String>, InitializingBean, DisposableBean {
+    private final Logger log = LoggerFactory.getLogger(CalcStr.class);
+
+    @Override
+    public void afterPropertiesSet() {
+        log.info("CalcStr.afterPropertiesSet()");
+    }
+
+    @Override
+    public void destroy() {
+        log.info("CalcStr.destroy()");
+    }
+
+    @Override
+    public String Plus(String first, String second) {
+        return first.concat(second);
+    }
+
+    @Override
+    public String Mult(String first, String second) {
+        String temp = first;
+        for (int i = 0; i < Integer.parseInt(second) - 1; i++) {
+            temp = Plus(temp, first);
+        }
+        return temp;
+    }
+
+    @Override
+    public String Minus(String first, String second) {
+        return first.replaceFirst(second, "");
+    }
+
+    @Override
+    public String Div(String first, String second) {
+        return first.replaceAll(second, "");
+    }
+}
diff --git a/src/main/java/com/labwork1/app/calc/domain/ICalc.java b/src/main/java/com/labwork1/app/calc/domain/ICalc.java
new file mode 100644
index 0000000..a839a8d
--- /dev/null
+++ b/src/main/java/com/labwork1/app/calc/domain/ICalc.java
@@ -0,0 +1,11 @@
+package com.labwork1.app.calc.domain;
+
+public interface ICalc<T> {
+    T Plus(T first, T second);
+
+    T Mult(T first, T second);
+
+    T Minus(T first, T second);
+
+    T Div(T first, T second);
+}
diff --git a/src/main/java/com/labwork1/app/calc/service/CalcService.java b/src/main/java/com/labwork1/app/calc/service/CalcService.java
new file mode 100644
index 0000000..c20295b
--- /dev/null
+++ b/src/main/java/com/labwork1/app/calc/service/CalcService.java
@@ -0,0 +1,52 @@
+package com.labwork1.app.calc.service;
+
+import com.labwork1.app.calc.domain.CalcNum;
+import com.labwork1.app.calc.domain.CalcStr;
+import com.labwork1.app.calc.domain.ICalc;
+import org.springframework.context.ApplicationContext;
+import org.springframework.stereotype.Service;
+
+@Service
+public class CalcService {
+    private final ApplicationContext applicationContext;
+
+    public CalcService(ApplicationContext applicationContext) {
+        this.applicationContext = applicationContext;
+    }
+
+    public String plus(Object first, Object second, String type) {
+        final ICalc temp = (ICalc) applicationContext.getBean(type);
+        if (temp instanceof CalcStr) {
+            return String.format("%s", temp.Plus(first, second));
+        }else{
+            return String.format("%s", temp.Plus(Integer.parseInt(first.toString()), Integer.parseInt(second.toString())));
+        }
+    }
+
+    public String minus(Object first, Object second, String type) {
+        final ICalc temp = (ICalc) applicationContext.getBean(type);
+        if (temp instanceof CalcStr) {
+            return String.format("%s", temp.Minus(first, second));
+        }else{
+            return String.format("%s", temp.Minus(Integer.parseInt(first.toString()), Integer.parseInt(second.toString())));
+        }
+    }
+
+    public String mult(Object first, Object second, String type) {
+        final ICalc temp = (ICalc) applicationContext.getBean(type);
+        if (temp instanceof CalcStr) {
+            return String.format("%s", temp.Mult(first, second));
+        }else{
+            return String.format("%s", temp.Mult(Integer.parseInt(first.toString()), Integer.parseInt(second.toString())));
+        }
+    }
+
+    public String div(Object first, Object second, String type) {
+        final ICalc temp = (ICalc) applicationContext.getBean(type);
+        if (temp instanceof CalcStr) {
+            return String.format("%s", temp.Div(first, second));
+        }else{
+            return String.format("%s", temp.Div(Integer.parseInt(first.toString()), Integer.parseInt(second.toString())));
+        }
+    }
+}
diff --git a/src/test/java/com/labwork1/app/AppApplicationTests.java b/src/test/java/com/labwork1/app/AppApplicationTests.java
index 0d5c808..357b11b 100644
--- a/src/test/java/com/labwork1/app/AppApplicationTests.java
+++ b/src/test/java/com/labwork1/app/AppApplicationTests.java
@@ -1,13 +1,56 @@
 package com.labwork1.app;
 
+import com.labwork1.app.calc.service.CalcService;
+import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
 
 @SpringBootTest
 class AppApplicationTests {
 
+	@Autowired
+	CalcService calcService;
+
 	@Test
-	void contextLoads() {
+	void testPlusNum() {
+		final String res = calcService.plus(10, 10, "num");
+		Assertions.assertEquals(20, Integer.parseInt(res));
+	}
+	@Test
+	void testMinusNum() {
+		final String res = calcService.minus(5, 2, "num");
+		Assertions.assertEquals(3, Integer.parseInt(res));
+	}
+	@Test
+	void testMultNum() {
+		final String res = calcService.mult(10, 10, "num");
+		Assertions.assertEquals(100, Integer.parseInt(res));
+	}
+	@Test
+	void testDivNum() {
+		final String res = calcService.div(20, 10, "num");
+		Assertions.assertEquals(2, Integer.parseInt(res));
+	}
+	@Test
+	void testPlusStr() {
+		final String res = calcService.plus("10", "10", "str");
+		Assertions.assertEquals("1010", res);
+	}
+	@Test
+	void testMinusStr() {
+		final String res = calcService.minus("5252", "2", "str");
+		Assertions.assertEquals("552", res);
+	}
+	@Test
+	void testMultStr() {
+		final String res = calcService.mult("5", "3", "str");
+		Assertions.assertEquals("555", res);
+	}
+	@Test
+	void testDivStr() {
+		final String res = calcService.div("5252", "2", "str");
+		Assertions.assertEquals("55", res);
 	}
 
 }