diff --git a/programmers/[1차] 프렌즈4블록/solution.java b/programmers/[1차] 프렌즈4블록/solution.java
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+++ b/programmers/[1차] 프렌즈4블록/solution.java	
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+// [문제 링크]: https://school.programmers.co.kr/learn/courses/30/lessons/17679
+
+import java.util.*;
+class Solution {
+    public int solution(int m, int n, String[] board) {
+        int answer = 0, rlen = board.length, clen = board[0].length();
+        Character[][] boa = new Character[rlen][clen];
+        for(int a = 0; a < rlen; a++) boa[a] = board[a].chars().mapToObj(c -> (char)c).toArray(Character[]::new);
+        while(true){
+            Character[][] temp = new Character[rlen][clen]; 
+            for(int a = 0; a < rlen; a++) {
+                temp[a] = boa[a].clone();
+                // System.out.println(Arrays.toString(temp[a])); //프린트해서 확인하기
+            }
+            HashSet<Integer> hs = new HashSet<>();
+            boolean bigChk = false;
+            for(int a = 0; a < rlen-1; a++){
+                for(int b = 0; b < clen-1; b++){
+                    Character me = boa[a][b];
+                    boolean chk = true;
+                    for(int c = 0; c < 2; c++){
+                        for(int d = 0; d < 2; d++){
+                            if(c == 0 && d == 0) continue;
+                            if(me == ' ') {
+                                chk = false;
+                                break;
+                            }
+                            if(boa[a+c][b+d] != me) chk = false;
+                        }
+                    }
+                    if(chk) {
+                        bigChk = true;
+                        for(int c = 0; c < 2; c++){
+                            for(int d = 0; d < 2; d++){
+                                hs.add((a+c)*clen+b+d);
+                            }
+                        }
+                    }
+                }
+            } 
+            if(!bigChk) break;
+            
+            for(int set : hs){
+                int r = set/clen, c = set%clen;
+                temp[r][c] = ' ';
+                answer++;
+            }
+            boa = trans(remove(trans(temp)));
+        }
+
+        return answer;
+    }
+    public Character[][] trans(Character[][] ob){
+        Character[][] temp = new Character[ob[0].length][ob.length];
+        for(int a = 0; a < ob.length; a++){
+            for(int b = 0; b < ob[0].length; b++){
+                temp[b][a] = ob[a][b];
+            }
+        }
+        return temp;
+    }
+    public Character[][] remove(Character[][] temp){
+        for(int a = 0; a < temp.length; a++){
+            Arrays.sort(temp[a], new Comparator<Character>(){
+              @Override
+              public int compare(Character s1, Character s2){
+                  if(s1 == ' ' && s2 == ' ') return 0;
+                  else if(s1 == ' ' && s2 != ' ') return -1;
+                  else if(s1 != ' ' && s2 == ' ') return 1;
+                  else return 0;
+              }
+            });
+        }
+        return temp;
+    }
+}
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