diff --git "a/work/com/java/minxi/java_20240515/java_2302_\346\235\216\346\224\277\345\223\262_2344310218/zy0515.java" "b/work/com/java/minxi/java_20240515/java_2302_\346\235\216\346\224\277\345\223\262_2344310218/zy0515.java"
new file mode 100644
index 0000000000000000000000000000000000000000..0e639b207ed14c3ef08883b1fe4151aee850af11
--- /dev/null
+++ "b/work/com/java/minxi/java_20240515/java_2302_\346\235\216\346\224\277\345\223\262_2344310218/zy0515.java"
@@ -0,0 +1,91 @@
+package com.java.minxi.java_20240515.java_2302_李政哲_2344310218;
+
+import java.util.*;
+import java.util.function.BiConsumer;
+
+class Temp {
+}
+
+public class zy0515 {
+    public static void main(String[] args) {
+        HashSet<String> hashSet = new HashSet<>();
+        for (int i = 0; i < 5; i++) {
+            hashSet.add(String.valueOf(i));
+        }
+        System.out.println(hashSet);
+
+        System.out.println(hashSet.contains("3"));
+
+        hashSet.remove("1");
+        System.out.println(hashSet.contains("1"));
+
+        System.out.println(hashSet.size());
+
+
+        hashSet.forEach(System.out::println);
+
+        for (String a :
+                hashSet.toArray(new String[0])) {
+            System.out.println(a);
+        }
+
+        HashSet<String> hashSet1 = new HashSet<>();
+        for (int i = 3; i < 8; i++) {
+            hashSet1.add(String.valueOf(i));
+        }
+        System.out.println(hashSet1);
+
+        HashSet<String> hashSet2 = new HashSet<>(hashSet);
+
+        hashSet2.addAll(hashSet1);
+        System.out.println(hashSet2);
+
+        HashSet<String> hashSet3 = new HashSet<>(hashSet);
+
+        hashSet3.retainAll(hashSet1);
+        System.out.println(hashSet3);
+
+        HashSet<String> hashSet5 = new HashSet<>(hashSet);
+
+        HashSet<String> hashSet6 = new HashSet<>(hashSet);
+        hashSet5.removeAll(hashSet1);
+        hashSet1.removeAll(hashSet6);
+        hashSet5.addAll(hashSet1);
+        System.out.println(hashSet5);
+
+        ////////////////////////////
+
+        HashMap<String, Integer> hashMap = new HashMap<>();
+        hashMap.put("a", 1);
+        hashMap.put("b", 2);
+        hashMap.put("c", 3);
+        System.out.println(hashMap);
+
+        System.out.println(hashMap.get("b"));
+
+        System.out.println(hashMap.containsKey("b"));
+
+
+        hashMap.forEach((k, v) -> {
+            System.out.println(v);
+        });
+
+        hashMap.forEach((k, v) -> {
+            System.out.println(k);
+        });
+
+        hashMap.entrySet().forEach(System.out::println);
+
+        hashMap.replace("b", 9);
+        System.out.println(hashMap);
+
+        System.out.println(hashMap.remove("b", 9));
+        System.out.println(hashMap);
+
+        System.out.println(hashMap.size());
+
+        HashMap<Temp, String> hashMap1 = new HashMap<>();
+        hashMap1.put(new Temp(), "1");
+        System.out.println(hashMap1);
+    }
+}
diff --git "a/work/com/java/minxi/java_20240516/java_2302_\346\235\216\346\224\277\345\223\262_2344310218/zy0516.java" "b/work/com/java/minxi/java_20240516/java_2302_\346\235\216\346\224\277\345\223\262_2344310218/zy0516.java"
new file mode 100644
index 0000000000000000000000000000000000000000..7c739c522d084494f54dbb5fd96a6f73f9182760
--- /dev/null
+++ "b/work/com/java/minxi/java_20240516/java_2302_\346\235\216\346\224\277\345\223\262_2344310218/zy0516.java"
@@ -0,0 +1,151 @@
+package com.java.minxi.java_20240516.java_2302_李政哲_2344310218;
+
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.Arrays;
+import java.util.Date;
+import java.util.Scanner;
+
+class Person{
+    private String name;
+    private int age;
+
+    public Person(String name, int age) {
+        this.name = name;
+        this.age = age;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    @Override
+    public String toString() {
+        return name+age;
+    }
+
+
+    public boolean equals(Person person) {
+
+        return person.getName().equals(this.name) && person.getAge()==this.age;
+    }
+}
+public class zy0516 {
+    public static void main(String[] args) {
+
+        Scanner scanner=new Scanner(System.in);
+
+        System.out.println(Math.abs(scanner.nextInt()));
+
+
+        int b=scanner.nextInt();
+        int c=scanner.nextInt();
+        int d=scanner.nextInt();
+
+        System.out.println(Math.min(Math.min(b,c),d));
+        System.out.println(Math.max(Math.max(b,c),d));
+
+        System.out.println(Math.round(scanner.nextDouble()));
+
+        System.out.println(Math.random()*scanner.nextInt());
+
+        int[] a={b,c,d};
+        System.out.println(average(a));
+
+        /////////////////////////////////////////
+
+        Date date=new Date();
+        System.out.println(date);
+
+        System.out.println(getDate(date));
+
+        SimpleDateFormat simpleDateFormat=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
+        System.out.println(simpleDateFormat.format(date));
+
+        String d=simpleDateFormat.format(date);
+        Date date1=null;
+        try{
+            date1= simpleDateFormat.parse(d);
+        }catch (ParseException e){
+            e.printStackTrace();
+        }
+        System.out.println(date1);
+
+        Date date2=new Date(System.currentTimeMillis());
+        System.out.println(simpleDateFormat.format(date2));
+
+        /////////////////////////////
+
+        String a1="a";
+        String b1="b";
+        System.out.println(a1.concat(b1));
+
+        System.out.println(stringLenth(a1));
+
+        System.out.println(Arrays.toString("a,b".split(",")));
+
+        System.out.println(stringReverse("a,b"));
+
+        System.out.println(stringCase("a,B", true));
+        System.out.println(stringCase("a,B", false));
+
+        System.out.println("a,B".contains(a1));
+
+        System.out.println(stringReplaceA("aaaaaaabbbbbbbbb"));
+
+        System.out.println(stringTrim(" a "));
+
+        System.out.println("a".equalsIgnoreCase("A"));
+
+        System.out.println(stringSub("aaaaaaaaaaaaaaaaaaa", 3, 6));
+
+        System.out.println("aaaaaaa".endsWith("bbb"));
+
+        System.out.println(stringStartWith("aaaaaaaaaa", "a"));
+
+
+    }
+    static boolean stringStartWith(String a,String b){
+        return a.startsWith(b);
+    }
+    static String stringSub(String a,int start,int end){
+        return a.substring(start,end);
+    }
+    static String stringReplaceA(String a){
+        return a.replaceAll("a", "b");
+    }
+    static String stringTrim(String a){
+        return a.trim();
+    }
+    static String stringCase(String a,boolean up){
+
+        if (up){
+            return a.toUpperCase();
+        }else{
+            return a.toLowerCase();
+        }
+    }
+    static String stringReverse(String a){
+        StringBuilder stringBuilder=new StringBuilder(a);
+        return stringBuilder.reverse().toString();
+    }
+    static int stringLenth(String a){
+        return a.length();
+    }
+    static int average(int[] a){
+        int sum=0;
+        for (int b :
+        a) {
+            sum+=b;
+        }
+        return sum/a.length;
+    }
+
+    static String getDate(Date date){
+        return "年份："+(date.getYear()+1900)+"\n月份："+(date.getMonth()+1)+"\n天数："+date.getDate();
+    }
+}