refactor 401

Author: fishercoder1534

src/main/java/com/fishercoder/solutions/_401.java

@@ -29,7 +29,7 @@ public List<String> readBinaryWatch(int num) {
             List<String> times = new ArrayList<>();
             for (int h = 0; h < 12; h++) {
                 for (int m = 0; m < 60; m++) {
-                    if (Integer.bitCount(h * 60 + m) == num) {
+                    if (Integer.bitCount(h * 64 + m) == num) {
                         times.add(String.format("%d:%02d", h,
                             m));//%02 means to pad this two-digit decimal number on the left with zeroes
                     }

src/test/java/com/fishercoder/_401Test.java

@@ -0,0 +1,24 @@
+package com.fishercoder;
+
+import com.fishercoder.solutions._401;
+import java.util.Arrays;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+import static junit.framework.TestCase.assertEquals;
+
+public class _401Test {
+  private static _401.Solution1 solution1;
+
+  @BeforeClass
+  public static void setup() {
+    solution1 = new _401.Solution1();
+  }
+
+  @Test
+  public void test1() {
+    assertEquals(
+        Arrays.asList("0:01", "0:02", "0:04", "0:08", "0:16", "0:32", "1:00", "2:00", "4:00",
+            "8:00"), solution1.readBinaryWatch(1));
+  }
+}