diff --git "a/work/com/java/minxi/java_20240508/java_2302_\351\231\266\347\233\233\345\215\232_2344310243/Main_4.java" "b/work/com/java/minxi/java_20240508/java_2302_\351\231\266\347\233\233\345\215\232_2344310243/Main_4.java"
index 44b62e168d62a8809f3e51710138df1fefb7ff1f..05a422cf93d72bb18e87d8ce84ec46e25dc93ff8 100644
--- "a/work/com/java/minxi/java_20240508/java_2302_\351\231\266\347\233\233\345\215\232_2344310243/Main_4.java"
+++ "b/work/com/java/minxi/java_20240508/java_2302_\351\231\266\347\233\233\345\215\232_2344310243/Main_4.java"
@@ -39,4 +39,4 @@ public class Main_4 {
 
     }
     }
-}
+
diff --git "a/work/com/java/minxi/java_20240516/java_2302_\351\231\266\347\233\233\345\215\232_2344310243/Date.java" "b/work/com/java/minxi/java_20240516/java_2302_\351\231\266\347\233\233\345\215\232_2344310243/Date.java"
index fcf7e605e1d082abd5abdebf740cb81f627901a7..a5646bb2af8db4baec9c742286efb3e5f6e72fbb 100644
--- "a/work/com/java/minxi/java_20240516/java_2302_\351\231\266\347\233\233\345\215\232_2344310243/Date.java"
+++ "b/work/com/java/minxi/java_20240516/java_2302_\351\231\266\347\233\233\345\215\232_2344310243/Date.java"
@@ -1,7 +1,37 @@
 package com.java.minxi.java_20240516.java_2302_陶盛博_2344310243;
 
-public class Date {
-    public static void main(String[] args) {
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.Calendar;
+
+
+public class Date extends java.util.Date {
+
+
+
+
+    public static void main(String[] args) throws ParseException {
+        Date date = new Date();
+        Calendar instance = Calendar.getInstance();
+        instance.setTime(date);
+        int i =instance.get(Calendar.YEAR);
+        System.out.println(i);
+
+        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd-HH:mm:ss");
+
+        String format  = simpleDateFormat.format(date);
+        System.out.println(format);
+
+        Date parse= (Date) simpleDateFormat.parse(format);
+
+
+        long l = System.currentTimeMillis();
+        Date date1 = new Date();
+        String format1 = simpleDateFormat.format(date1);
+
+
+
+
 
 
 
diff --git "a/work/com/java/minxi/java_20240516/java_2302_\351\231\266\347\233\233\345\215\232_2344310243/Main_1.java" "b/work/com/java/minxi/java_20240516/java_2302_\351\231\266\347\233\233\345\215\232_2344310243/Main_1.java"
new file mode 100644
index 0000000000000000000000000000000000000000..35d47308512f22ab3b4ff92ed816a6afbdcae70a
--- /dev/null
+++ "b/work/com/java/minxi/java_20240516/java_2302_\351\231\266\347\233\233\345\215\232_2344310243/Main_1.java"
@@ -0,0 +1,59 @@
+package com.java.minxi.java_20240516.java_2302_陶盛博_2344310243;
+
+import java.math.BigDecimal;
+
+public class Main_1 {
+    public static void main(String[] args) {
+        String str = "a"+"b"+"c";
+        int length1 =getLength(str);
+
+        String str1 = "a"+"b"+"c";
+        String[] split= str1.split(",");
+
+        StringBuffer stringBuffer = new StringBuffer();
+        StringBuffer append= stringBuffer.append(str1);
+        StringBuffer reverse = append.reverse();
+        System.out.println(reverse);
+
+        String tesr= "asdfgdfa";
+        String s1=tesr.toUpperCase();
+        String s2 = tesr.toLowerCase();
+
+        tesr.contains("d");
+        tesr.replace("d","c");
+
+
+
+        tesr.trim();
+        str1.equals(tesr);
+        str1.equalsIgnoreCase(tesr);
+
+        tesr.substring(1,2);
+
+
+        tesr.endsWith("b");
+        tesr.startsWith("d");
+
+        String te = "3.05";
+        double v = Double.parseDouble(te);
+
+        StringBuilder stringBuilder= new StringBuilder();
+        StringBuilder append1= stringBuilder.append(str1);
+
+        BigDecimal bigDecimal = new BigDecimal(3.05);
+
+        BigDecimal add= bigDecimal.add(bigDecimal);
+        BigDecimal subtract = bigDecimal.subtract(bigDecimal);
+        BigDecimal multiply = bigDecimal.multiply(bigDecimal);
+        BigDecimal DIVIDE = bigDecimal.divide(bigDecimal,2,BigDecimal.ROUND_HALF_UP);
+
+        int rs = bigDecimal.compareTo(bigDecimal);
+
+
+
+    }
+
+    private static int getLength(String str) {
+        return str.length();
+    }
+}