diff --git a/Application.java b/Application.java
new file mode 100644
index 000000000..534509bcd
--- /dev/null
+++ b/Application.java
@@ -0,0 +1,116 @@
+package baseball;
+import camp.nextstep.edu.missionutils.test.Randoms;
+import camp.nextstep.edu.missionutils.test.Console;
+
+
+public class Application {
+    public static void main(String[] args) {
+        Computer computer = new Computer();
+        Player player = new Player();
+        boolean gameover = true;
+        Again again = new Again();
+        Judging judge = new Judging();
+        while(gameover){
+            List<Integer> ComputerNumber = computer.computerNum();
+            String answer = "";
+            while(answer != "3스트라이크"){
+                answer = judge.Result(ComputerNumber, player.PlayerNum());
+                System.out.println(answer);
+            }
+            gameover = again.doitagain();
+        }
+
+
+    }
+}
+
+
+public class Computer{
+    public int computerNum{
+        List<Integer>  randomNum = new ArrayList<>();
+        while (randomNum.size()<3) {
+            int num = Randoms.pickNumberInRange(1,9);
+            if (!randomNum.contains(num)) {
+                randomNum,add(num);
+            }
+        }
+        return randomNum;
+    }
+}
+
+
+public class Player{
+    public int PlayerNum(){
+        System.out.println("숫자를 입력하세요: ");
+        String input = Console.readLine();
+        List<Integer> playerNum = new ArrayList<Integer>(3);
+        try {
+            for (String number : input) {
+                playerNum.add(Integer.parseInt(number));
+            }
+        } catch (IllegalArgumentException e) {
+            System.out.println("입력이 올바르지 않습니다.");
+        }
+        return playerNum;
+    }
+}
+
+
+public class Guessing{
+    public int Strikes(List<Integer> computerNum, List<Integer> playerNum){
+        int strike = 0;
+        for(int i = 0; i < 3; i++){
+            if(computerNum[i] = playerNum[i]){
+                strike+=1;
+            }
+        }
+        return strike
+    }
+    public int TotalCounts(List<Integer> computerNum, List<Integer> playerNum){
+        int total = 0;
+        for(int i = 0;i < 3; i++){
+            if(computerNum.contains(playerNum[i])){
+                total += 1;
+            }
+        }
+        return total;
+    }
+}
+
+
+public class Judging{
+    Guessing guess = new Guessing;
+    public String Result(List<Integer> computerNum, List<Integer> playerNum){
+        int strike = guess.Strikes(computerNum, playerNum);
+        int total = guess.TotalCounts(computerNum, playerNum);
+        int ball = total - strike;
+        if (strike == 3){
+            return "3스트라이크";
+        }
+        else if (total == 0){
+            return "낫싱";
+        }
+        else if (strike == 0){
+            return ball + "볼";
+        }
+        else if (ball == 0){
+            return stirke + "스트라이크";
+        }
+        return ball + "볼 " + strike + "스트라이크";
+    }
+}
+
+
+public class Again{
+    public boolean doitagain(){
+        System.out.println("3개의 숫자를 모두 맞히셨습니다! 게임 종료");
+        Syste.out.println("게임을 새로 시작하려면 1, 종료하려면 2를 입력하세요.");
+        int again = Console.readLine();
+        if (again == 1){
+           return true;
+        }
+        else{
+            return false;
+        }
+    }
+}
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