Front output of array was changed to basic for arrays.

.idea/.name

@@ -0,0 +1 @@
+sbapp

src/main/java/ru/ulstu/is/sbapp/Controllers/StringController.java

@@ -15,28 +15,28 @@ public class StringController {
         this.converterService = converterService;
     }
     @GetMapping("/toupper")
-    public String toUpper(@RequestParam(value = "value",defaultValue = " ") Object value,
+    public Object toUpper(@RequestParam(value = "value",defaultValue = " ") Object value,
                           @RequestParam(value = "type",defaultValue = "String") String converterType)
     {
         return converterService.toUpper(value,converterType);
     }
 
     @GetMapping("/removews")
-    public String removeWhitespaces(@RequestParam(value = "value",defaultValue = " ") Object value,
+    public Object removeWhitespaces(@RequestParam(value = "value",defaultValue = " ") Object value,
                                     @RequestParam(value = "type",defaultValue = "String") String converterType)
     {
         return converterService.removeWhitespaces(value,converterType);
     }
 
     @GetMapping("/removedigits")
-    public String removeDigits(@RequestParam(value = "value",defaultValue = " ") Object value,
+    public Object removeDigits(@RequestParam(value = "value",defaultValue = " ") Object value,
                                @RequestParam(value = "type",defaultValue = "String") String converterType)
     {
         return converterService.removeDigits(value,converterType);
     }
 
     @GetMapping("/tolower")
-    public String toLower(@RequestParam(value = "value",defaultValue = " ") Object value,
+    public Object toLower(@RequestParam(value = "value",defaultValue = " ") Object value,
                           @RequestParam(value = "type",defaultValue = "String") String converterType)
     {
         return converterService.toLower(value,converterType);

src/main/java/ru/ulstu/is/sbapp/Implementation/StringArrayConverter.java

@@ -3,48 +3,29 @@ package ru.ulstu.is.sbapp.Implementation;
 import org.springframework.stereotype.Component;
 import ru.ulstu.is.sbapp.Interfaces.Converter;
 
+import java.util.Arrays;
+import java.util.stream.Collectors;
+
 @Component(value = "AString")
-public class StringArrayConverter implements Converter<String []>
+public class StringArrayConverter implements Converter<String[]>
 {
-    public StringBuilder fullStr;
-
     @Override
-    public String toUpper(String [] value) {
-        fullStr = new StringBuilder();
-        for (String word : value)
-        {
-            fullStr.append(word.toUpperCase() + "|");
-        }
-        return fullStr.toString();
+    public String[] toUpper(String[] value) {
+        return Arrays.stream(value).map(word -> word.toUpperCase()).toArray(String[]::new);
     }
 
     @Override
-    public String removeWhitespaces(String[] value) {
-        fullStr = new StringBuilder();
-        for (String word : value)
-        {
-            fullStr.append(word.replaceAll("\s+","") + "|");
-        }
-        return fullStr.toString();
+    public String[] removeWhitespaces(String[] value) {
+        return (String[]) Arrays.stream(value).map(word -> word.replaceAll("\s+","")).toArray(String[]::new);
     }
 
     @Override
-    public String removeDigits(String[] value) {
-        fullStr = new StringBuilder();
-        for (String word : value)
-        {
-            fullStr.append(word.replaceAll("\\d","") + "|");
-        }
-        return fullStr.toString();
+    public String[] removeDigits(String[] value) {
+        return (String[]) Arrays.stream(value).map(word -> word.replaceAll("\\d","")).toArray(String[]::new);
     }
 
     @Override
-    public String toLower(String[] value) {
-        fullStr = new StringBuilder();
-        for (String word : value)
-        {
-            fullStr.append(word.toLowerCase() + "|");
-        }
-        return fullStr.toString();
+    public String[] toLower(String[] value) {
+        return (String[]) Arrays.stream(value).map(word -> word.toLowerCase()).toArray(String[]::new);
     }
 }

src/main/java/ru/ulstu/is/sbapp/Interfaces/Converter.java

@@ -1,9 +1,11 @@
 package ru.ulstu.is.sbapp.Interfaces;
 
+import org.springframework.context.annotation.Bean;
+
 public interface Converter<T>
 {
-    public String toUpper(T value);
-    public String removeWhitespaces(T value);
-    public String removeDigits(T value);
-    public String toLower(T value);
+    public T toUpper(T value);
+    public T removeWhitespaces(T value);
+    public T removeDigits(T value);
+    public T toLower(T value);
 }

src/main/java/ru/ulstu/is/sbapp/Services/ConverterService.java

@@ -1,6 +1,7 @@
 package ru.ulstu.is.sbapp.Services;
 
 import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.Bean;
 import org.springframework.stereotype.Service;
 import ru.ulstu.is.sbapp.Interfaces.Converter;
 import java.util.Arrays;
@@ -9,50 +10,43 @@ import java.util.Arrays;
 public class ConverterService
 {
     private final ApplicationContext applicationContext;
-    private String[] str;
     public ConverterService(ApplicationContext applicationContext)
     {
         this.applicationContext = applicationContext;
     }
+    public Object toUpper(Object value, String converterType)
+    {
+        Converter converter = (Converter) applicationContext.getBean(converterType);
+        if(converterType.equals("String")) {
+            return converter.toUpper(value);
+        }
 
-    public String toUpper(Object value, String converterType)
-    {
-        Converter converter = (Converter) applicationContext.getBean(converterType);
-        if(converterType.equals("String"))
-        {
-            return converter.toUpper(value.toString());
-        }
-        str = value.toString().split(" ");
-        return converter.toUpper(str);
+        return converter.toUpper(value.toString().split("\s+"));
     }
-    public String removeWhitespaces(Object value, String converterType)
+    public Object removeWhitespaces(Object value, String converterType)
     {
         Converter converter = (Converter) applicationContext.getBean(converterType);
-        if(converterType.equals("String"))
-        {
-            return converter.removeWhitespaces(value.toString());
+        if(converterType.equals("String")) {
+            return converter.removeWhitespaces(value);
         }
-        str = value.toString().split(" ");
-        return converter.removeWhitespaces(str);
+        return converter.removeWhitespaces(value.toString().split("\s+"));
     }
-    public String removeDigits(Object value, String converterType)
+    public Object removeDigits(Object value, String converterType)
     {
         Converter converter = (Converter) applicationContext.getBean(converterType);
         if(converterType.equals("String"))
         {
-            return converter.removeDigits(value.toString());
+            return converter.removeDigits(value);
         }
-        str = value.toString().split(" ");
-        return converter.removeDigits(str);
+        return converter.removeDigits(value.toString().split("\s+"));
     }
-    public String toLower(Object value, String converterType)
+    public Object toLower(Object value, String converterType)
     {
         Converter converter = (Converter) applicationContext.getBean(converterType);
         if(converterType.equals("String"))
         {
-            return converter.toLower(value.toString());
+            return converter.toLower(value);
         }
-        str = value.toString().split(" ");
-        return converter.toLower(str);
+        return converter.toLower(value.toString().split("\s+"));
     }
 }

src/test/java/ru/ulstu/is/sbapp/ConverterServiceTests.java

@@ -36,21 +36,25 @@ public class ConverterServiceTests
     @Test
     public void aStringToUpper()
     {
-        Assertions.assertEquals("LOVE|PROGRAMMING|",converterService.toUpper("love programming","AString"));
+        String expected[] = new String[]{"LOVE","PROGRAMMING"};
+        Assertions.assertArrayEquals(expected,(String[])converterService.toUpper("love programming","AString"));
     }
     @Test
     public void aStringToLower()
     {
-        Assertions.assertEquals("love|programming|",converterService.toLower("LOVE PROGRAMMING","AString"));
+        String expected[] = new String[]{"love","programming"};
+        Assertions.assertArrayEquals(expected,(String[])converterService.toLower("LOVE PROGRAMMING","AString"));
     }
     @Test
     public void aStringRemoveDigits()
     {
-        Assertions.assertEquals("LVE|PRGRAMMNG|",converterService.removeDigits("L0VE PR0GRAMM1NG","AString"));
+        String expected[] = new String[]{"LVE","PRGRAMMNG"};
+        Assertions.assertArrayEquals(expected, (String[]) converterService.removeDigits("L0VE PR0GRAMM1NG","AString"));
     }
     @Test
     public void aStringRemoveWhitespaces()
     {
-        Assertions.assertEquals("lo|ve|pro|gramm|i|ng|",converterService.removeWhitespaces("lo ve pro gramm i ng","AString"));
+        String expected[] = new String[]{"lo","ve","pro","gramm","i","ng"};
+        Assertions.assertArrayEquals(expected,(String[])converterService.removeWhitespaces("lo ve pro gramm i ng","AString"));
     }
 }