diff --git a/programmers/모의고사/solution.java b/programmers/모의고사/solution.java
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index 0000000..275a236
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+++ b/programmers/모의고사/solution.java
@@ -0,0 +1,34 @@
+// [문제 링크]: https://school.programmers.co.kr/learn/courses/30/lessons/42840
+
+import java.util.*;
+import java.lang.*;
+import java.util.stream.Collectors;
+class Solution {
+    public int[] solution(int[] answers) {
+        int[] answer = {};
+        int[][] player = {{1,2,3,4,5},{2, 1, 2, 3, 2, 4, 2, 5},{3,3,1,1,2,2,4,4,5,5}};
+        HashMap<Integer, Integer> pls = new HashMap<>();
+        for(int a = 0; a < answers.length ; a++){
+            for(int bb = 0; bb < player.length; bb++){
+                int[] p = player[bb];
+                int index = a%p.length;
+                if(p[index] == answers[a]) {
+                    System.out.println("b: "+bb+" index "+index+" "+p[index]+" "+answers[a]);
+                    pls.put(bb+1, pls.getOrDefault(bb+1,0)+1);
+                }
+            }
+        }
+        int maxData = pls.entrySet().stream()
+                .sorted(Map.Entry.comparingByValue(Comparator.reverseOrder()))
+                .collect(Collectors.toList()).get(0).getValue();
+        System.out.println(maxData);
+        List<Integer> keyList = new ArrayList<Integer>();
+        for(Map.Entry<Integer, Integer> entry : pls.entrySet()){
+            if(entry.getValue()==maxData){
+              keyList.add(entry.getKey());
+            }
+        }
+        System.out.println(keyList);
+        return keyList.stream().mapToInt(i->i).toArray();
+    }
+}
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