한 디짓만 변경하여 최대값 찾기

Author: holmir97

Max69Num.java

@@ -0,0 +1,24 @@
+
+public class Max69Num {
+    public static void main(String[] args) {
+        System.out.println(maximum69Number(9699));
+    }
+    public static int maximum69Number (int num) {
+        String tmp="";
+        String strNum = Integer.toString(num);
+        String[] arrStrNum = strNum.split("");
+
+        for(int i = 0; i<arrStrNum.length; i++){
+            if(arrStrNum[i].equals("6")){
+                arrStrNum[i] = "9";
+                break;
+            }
+        }
+        for(int i =0 ;i<arrStrNum.length;i++)
+            tmp = tmp.concat(arrStrNum[i]);
+
+        strNum = tmp;
+        num = Integer.parseInt(strNum);
+        return num;
+    }
+}