Create KeyPad.java

programmers/KeyPad.java

@@ -0,0 +1,66 @@
+class Pos{
+    int x;
+    int y;
+
+    public Pos(int y, int x){
+        this.y = y;
+        this.x = x;
+    }
+}
+
+class Solution {
+    public static String solution(int[] numbers, String hand) {
+        String answer = "";
+        Pos left = new Pos(3, 0);       // *에서 시작
+        Pos right = new Pos(3, 2);      // #에서 시작
+        Pos key[] = new Pos[10];
+
+        int cnt = 1;
+        key[0] = new Pos(3,1);  // 0 위치
+
+        for(int i=0; i<3; i++){
+            for(int j=0; j<3; j++)
+                key[cnt++] = new Pos(i,j);
+        }
+
+            for(int i=0; i<numbers.length; i++){
+            Pos next =  key[numbers[i]];
+
+            if((next.y == 0 || next.y == 1 || next.y == 2) && next.x == 0) {  // 1, 4, 7 인 경우
+                left = next;
+                answer += "L";
+            }
+            else if((next.y == 0 || next.y == 1 || next.y == 2) && next.x == 2) { // 3, 6, 9인 경우
+                right = next;
+                answer += "R";
+            }
+            else{   // 2, 5, 8, 0 인 경우
+                int leftDis = Math.abs(left.x - next.x) + Math.abs(left.y - next.y);
+                int rightDis = Math.abs(right.x - next.x) + Math.abs(right.y - next.y);
+
+                if(hand.equals("left")) {
+                    if(leftDis<= rightDis){
+                        answer+= "L";
+                        left = next;
+                    }else{
+                        answer +="R";
+                        right = next;
+                    }
+
+                }
+                else if(hand.equals("right")) {
+                    if(leftDis >= rightDis){
+                        answer+= "R";
+                        right=next;
+                    }else{
+                        answer += "L";
+                        left = next;
+                    }
+                }
+            }
+
+        }
+
+        return answer;
+    }
+}