feat: 입출력 구현체 구현

Author: wonu606

calculator/doc/기능_목록.md

@@ -4,7 +4,7 @@
 
 ### 입력
 
-- [ ] 메뉴 번호를 입력받는다.
+- [x] 메뉴 번호를 입력받는다.
 - [ ] 계산 시, 중위 연산식을 입력받는다.
 
 ### 출력

calculator/src/main/java/com/wonu606/Main.java

@@ -2,15 +2,17 @@
 
 import com.wonu606.app.App;
 import com.wonu606.calculator.CalculatorApp;
+import com.wonu606.io.ConsolePrinter;
 import com.wonu606.io.Input;
 import com.wonu606.io.Print;
+import com.wonu606.io.ConsoleInput;
 import java.io.IOException;
 
 public class Main {
 
     public static void main(String[] args) {
-        Input input;
-        Print printer;
+        Input input = new ConsoleInput();
+        Print printer = new ConsolePrinter();
 
         CalculatorApp app = new CalculatorApp();
         try {

calculator/src/main/java/com/wonu606/io/ConsoleInput.java

@@ -0,0 +1,19 @@
+package com.wonu606.io;
+
+import java.io.IOException;
+import java.util.Scanner;
+
+public class ConsoleInput implements Input {
+
+    Scanner scanner = new Scanner(System.in);
+
+    @Override
+    public String getInput() throws IOException {
+        return scanner.nextLine();
+    }
+
+    @Override
+    public void tearDown() {
+        scanner.close();
+    }
+}

calculator/src/main/java/com/wonu606/io/ConsolePrinter.java

@@ -0,0 +1,18 @@
+package com.wonu606.io;
+
+public class ConsolePrinter implements Print {
+
+    @Override
+    public void print(String message) {
+        System.out.println(message);
+    }
+
+    @Override
+    public void print(int number) {
+        print(String.valueOf(number));
+    }
+
+    @Override
+    public void tearDown() {
+    }
+}

calculator/src/test/java/com/wonu606/io/ConsoleInputTest.java

@@ -17,7 +17,7 @@ void testMenuSelectionInput() throws IOException {
         InputStream in = new ByteArrayInputStream(menuSelection.getBytes());
         System.setIn(in);
 
-        Input input;
+        Input input = new ConsoleInput();
         assertThat(menuSelection).isEqualTo(input.getInput());
         input.tearDown();
     }
@@ -29,7 +29,7 @@ void testExpressionInput() throws IOException {
         InputStream in = new ByteArrayInputStream(expression.getBytes());
         System.setIn(in);
 
-        Input input;
+        Input input = new ConsoleInput();
         assertThat(expression).isEqualTo(input.getInput());
         input.tearDown();
     }
@@ -41,7 +41,7 @@ void testNewLineInput() throws IOException {
         InputStream in = new ByteArrayInputStream(newLine.getBytes());
         System.setIn(in);
 
-        Input input;
+        Input input = new ConsoleInput();
         assertThat("").isEqualTo(input.getInput());
         input.tearDown();
     }

calculator/src/test/java/com/wonu606/io/ConsolePrinterTest.java

@@ -16,7 +16,7 @@ void testIntegerPrint() {
         OutputStream out = new ByteArrayOutputStream();
         System.setOut(new PrintStream(out));
 
-        Print printer;
+        Print printer = new ConsolePrinter();
         int number = -1;
         printer.print(number);
 
@@ -29,7 +29,7 @@ void testStringPrint() {
         OutputStream out = new ByteArrayOutputStream();
         System.setOut(new PrintStream(out));
 
-        Print printer;
+        Print printer = new ConsolePrinter();
         String str = "Hello World";
         printer.print(str);