diff --git a/README.md b/README.md
index 8d7e8aee..16460788 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,10 @@
-# java-baseball-precourse
\ No newline at end of file
+# java-baseball-precourse
+
+# 프로젝트 기능 목록
+
+1. 사용자 입력 받기
+2. 입력 데이터 확인
+3. 결과 계산
+4. 계산된 결과 출력
+5. 에러 핸들링
+6. 게임 재시작 기능
\ No newline at end of file
diff --git a/src/main/java/Application.java b/src/main/java/Application.java
new file mode 100644
index 00000000..3000636a
--- /dev/null
+++ b/src/main/java/Application.java
@@ -0,0 +1,8 @@
+public class Application {
+    public static void main(String[] args){
+
+        BaseballProcess game = new BaseballProcess();
+
+        game.startGame();
+    }
+}
diff --git a/src/main/java/BaseballProcess.java b/src/main/java/BaseballProcess.java
new file mode 100644
index 00000000..563e6ed6
--- /dev/null
+++ b/src/main/java/BaseballProcess.java
@@ -0,0 +1,95 @@
+import java.util.*;
+
+public class BaseballProcess {
+
+    private List<Integer> randomNumber;
+    private Scanner sc = new Scanner(System.in);
+    
+    // 테스트 용도
+    public void setRandomNumber(List<Integer> randomNumber) {
+        this.randomNumber = randomNumber;
+    }
+    public List<Integer> getRandomNumber() {
+        return randomNumber;
+    }
+
+    public BaseballProcess(){
+        restart();
+    }
+
+    public void startGame(){
+        while(true){
+            System.out.print("숫자를 입력해 주세요 : ");
+            String input = sc.nextLine();
+
+            List<Integer> guess = parseInput(input);
+
+            int[] result = checkGuess(guess);
+
+            if(result[0] == 3){
+                System.out.println("3스트라이크");
+                System.out.println("3개의 숫자를 모두 맞히셨습니다! 게임 종료");
+                System.out.println("게임을 새로 시작하려면 1, 종료하렬면 2를 입력하세요.");
+
+                String command = sc.nextLine();
+                if("2".equals(command)){
+                    sc.close();
+                    break;
+                }
+                else{
+                    restart();
+                }
+            }
+            else{
+                printResult(result[0], result[1]);
+            }
+        }
+    }
+
+    public List<Integer> parseInput(String input){
+        List<Integer> number = new ArrayList<>();
+        for(char c: input.toCharArray()){
+            number.add(Character.getNumericValue(c));
+        }
+
+        return number;
+    }
+
+    public int[] checkGuess(List<Integer> guess){
+        int strike = 0;
+        int ball = 0;
+
+        for(int i=0; i<guess.size(); i++){
+            if(guess.get(i).equals(randomNumber.get(i))){
+                strike += 1;
+            }
+            else if(randomNumber.contains(guess.get(i))){
+                ball += 1;
+            }
+        }
+
+        return new int[]{strike, ball};
+    }
+
+    private void printResult(int strike, int ball){
+        if(strike==0 && ball==0){
+            System.out.println("낫싱");
+        }
+        else{
+            if(ball>0 && strike>0){
+                System.out.printf("%d볼 %d스트라이크\n", ball, strike);
+            }
+            else if(ball > 0){
+                System.out.printf("%d볼\n", ball);
+            }
+            else if(strike > 0){
+                System.out.printf("%d스트라이크\n", strike);
+            }
+        }
+    }
+
+    private void restart(){
+        randomNumber = RandomNumberGeneration.randomNumberProduce();
+        // System.out.printf("테스트: %s\n", randomNumber.toString());
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/RandomNumberGeneration.java b/src/main/java/RandomNumberGeneration.java
new file mode 100644
index 00000000..7d429396
--- /dev/null
+++ b/src/main/java/RandomNumberGeneration.java
@@ -0,0 +1,18 @@
+import java.util.*;
+
+public class RandomNumberGeneration {
+
+    public static List<Integer> randomNumberProduce(){
+        List<Integer> number = new ArrayList<>();
+
+        while(number.size() < 3){
+            int randomNum = (int)(Math.random()*9) + 1;
+
+            if(!number.contains(randomNum)){
+                number.add(randomNum);
+            }
+        }
+
+        return number;
+    }
+}
diff --git a/src/test/java/BaseballProcessTest.java b/src/test/java/BaseballProcessTest.java
new file mode 100644
index 00000000..cd7a6689
--- /dev/null
+++ b/src/test/java/BaseballProcessTest.java
@@ -0,0 +1,30 @@
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import static org.assertj.core.api.Assertions.*;
+
+import java.util.Arrays;
+import java.util.List;
+
+class BaseballProcessTest {
+
+    private BaseballProcess baseballProcess;
+
+    @BeforeEach
+    void setUp() {
+        baseballProcess = new BaseballProcess();
+        baseballProcess.setRandomNumber(Arrays.asList(1, 2, 3));
+    }
+
+    @Test
+    void testParseInput() {
+        List<Integer> expected = Arrays.asList(1, 2, 3);
+        assertThat(baseballProcess.parseInput("123")).isEqualTo(expected);
+    }
+
+    @Test
+    void testCheckGuess() {
+        assertThat(baseballProcess.checkGuess(Arrays.asList(1, 2, 3))).containsExactly(3, 0);
+        assertThat(baseballProcess.checkGuess(Arrays.asList(1, 2, 4))).containsExactly(2, 0);
+        assertThat(baseballProcess.checkGuess(Arrays.asList(4, 1, 2))).containsExactly(0, 2);
+    }
+}