diff --git a/bin/finalexam/StandardIO/DateFormatOutput.class b/bin/finalexam/StandardIO/DateFormatOutput.class
index 0bd9754..d29f13d 100644
Binary files a/bin/finalexam/StandardIO/DateFormatOutput.class and b/bin/finalexam/StandardIO/DateFormatOutput.class differ
diff --git a/bin/finalexam/StandardIO/StringInitialization.class b/bin/finalexam/StandardIO/StringInitialization.class
index 1c404e4..f0c4134 100644
Binary files a/bin/finalexam/StandardIO/StringInitialization.class and b/bin/finalexam/StandardIO/StringInitialization.class differ
diff --git a/src/finalexam/StandardIO/DateFormatOutput.java b/src/finalexam/StandardIO/DateFormatOutput.java
index b20a643..ca970fc 100644
--- a/src/finalexam/StandardIO/DateFormatOutput.java
+++ b/src/finalexam/StandardIO/DateFormatOutput.java
@@ -15,22 +15,19 @@ public class DateFormatOutput {
         String yearStr = "";
         String monthStr = "";
         String dateStr = "";
-        for (int i = 0; i < arr[0].length(); i++) {
+        for (int i = 0; i < arr[0].length(); i++)
             yearStr += num[arr[0].charAt(i) - '0'];
-        }
         yearStr += "年";
-        if (month < 10) {
+        if (month < 10)
             monthStr = num[month] + "月";
-        } else {
+        else
             monthStr = "十" + num[month % 10] + "月";
-        }
-        if (date < 10) {
+        if (date < 10)
             dateStr = num[date] + "日";
-        } else if (date < 20) {
+        else if (date < 20)
             dateStr = "十" + num[date % 10] + "日";
-        } else {
+        else
             dateStr = num[date / 10] + "十" + num[date % 10] + "日";
-        }
         System.out.println(yearStr + monthStr + dateStr);
     }
 }
diff --git a/src/finalexam/StandardIO/StringInitialization.java b/src/finalexam/StandardIO/StringInitialization.java
index af0d675..3f3883a 100644
--- a/src/finalexam/StandardIO/StringInitialization.java
+++ b/src/finalexam/StandardIO/StringInitialization.java
@@ -6,13 +6,14 @@ public class StringInitialization {
     public static void main(String[] var0) {
         Scanner sc = new Scanner(System.in);
         String s = sc.nextLine();
-        StringBuffer sb = new StringBuffer(s);
-        sb.setCharAt(0, Character.toUpperCase(sb.charAt(0)));
-        for (int i = 1; i < s.length(); ++i)
-            if (s.charAt(i - 1) != ',' && s.charAt(i - 1) != ' ')
-                sb.setCharAt(i, Character.toLowerCase(sb.charAt(i)));
+        char[] c = s.toCharArray();
+        c[0] = Character.toUpperCase(c[0]);
+        for (int i = 1; i < c.length; i++) {
+            if (c[i - 1] != ',' && c[i - 1] != ' ')
+                c[i] = Character.toLowerCase(c[i]);
             else
-                sb.setCharAt(i, Character.toUpperCase(sb.charAt(i)));
-        System.out.println(sb);
+                c[i] = Character.toUpperCase(c[i]);
+        }
+        System.out.println(new String(c));
     }
 }