🎉 feat: initial commit for 1019 using java

developer-zoe · developer-zoe · commit 0ac5a99bc698 · 2019-04-20T00:44:24.000+08:00
diff --git a/BasicLevel_Java/1019. 数字黑洞 (20).java b/BasicLevel_Java/1019. 数字黑洞 (20).java
@@ -0,0 +1,41 @@
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.Arrays;
+
+public class Main {
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        String str = br.readLine();
+        int num = Integer.parseInt(str);
+        while (true) {
+            int m = inc(num);
+            int n = desc(num);
+            num = m - n;
+            System.out.printf("%04d - %04d = %04d\n", m, n, num);
+            if (num == 6174 || num == 0) {
+                break;
+            }
+        }
+    }
+
+    public static int desc(int number) {
+        char[] array = String.format("%04d", number).toCharArray();
+        Arrays.sort(array);
+        int temp = 0;
+        for (int i = 0; i < 4; i++) {
+            temp = temp * 10 + (array[i] - '0');
+        }
+        return temp;
+    }
+
+    public static int inc(int number) {
+        char[] array = String.format("%04d", number).toCharArray();
+        Arrays.sort(array);
+        int temp = 0;
+        for (int i = 3; i >= 0; i--) {
+            temp = temp * 10 + (array[i] - '0');
+        }
+        return temp;
+    }
+}
