diff --git "a/28 \351\273\216\345\255\220\351\276\231/20230422 \347\273\203\344\271\240.md" "b/28 \351\273\216\345\255\220\351\276\231/20230422 \347\273\203\344\271\240.md"
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+```java
+作业规范【必读】
+
+命名要求：
+	1. 类名，接口名，枚举名，注解名使用大驼峰
+	2. 变量名，方法名，包名均使用小驼峰
+	3. 常量名全大写，多个单词下划线分割
+	4. 名字要见名知意，如果不知道对应的英文，可以使用拼音代替。不可使用无意义字符
+  
+代码规范：
+	格式要良好，使用IDEA格式化缩进（快捷键：Ctrl+Alt+L）
+  
+答题规范：
+	1. 每道题完整代码请贴入对应题目中的代码区。
+    2. 如果有运行结果的，请把代码运行结果放到文档中
+```
+
+
+
+# 【继承】
+
+## 题目1
+
+我们计划为一个电器销售公司制作一套系统，公司的主要业务是销售一些家用电器，例如：电冰箱、洗衣机、电视机产品。
+
+类的设计为：
+
+```
+冰箱类
+	属性：品牌、型号、颜色、售价、门款式、制冷方式
+
+洗衣机类
+	属性：品牌、型号、颜色、售价、电机类型、洗涤容量
+
+电视类
+	属性：品牌、型号、颜色、售价、屏幕尺寸、分辨率
+```
+
+**要求：**
+
+请根据上述类的设计，抽取父类“电器类”，并代码实现父类“电器类”、子类“冰箱类”，“洗衣机类”、“电视类”
+
+
+
+答题：
+
+```java
+public class DianQi {
+    /*
+    品牌、型号、颜色、售价
+     */
+    private String brand;
+    private String model;
+    private String color;
+    private double price;
+
+    public String getBrand() {
+        return brand;
+    }
+
+    public void setBrand(String brand) {
+        this.brand = brand;
+    }
+
+    public String getModel() {
+        return model;
+    }
+
+    public void setModel(String model) {
+        this.model = model;
+    }
+
+    public String getColor() {
+        return color;
+    }
+
+    public void setColor(String color) {
+        this.color = color;
+    }
+
+    public double getPrice() {
+        return price;
+    }
+
+    public void setPrice(double price) {
+        this.price = price;
+    }
+
+
+    public DianQi() {
+    }
+
+    public DianQi(String brand, String model, String color, double price) {
+        this.brand = brand;
+        this.model = model;
+        this.color = color;
+        this.price = price;
+    }
+}
+```
+
+
+
+```java
+public class BingXiang extends DianQi{
+    /*
+    门款式、制冷方式
+     */
+    private String meng;
+    private String zhileng;
+
+    public String getMeng() {
+        return meng;
+    }
+
+    public void setMeng(String meng) {
+        this.meng = meng;
+    }
+
+    public String getZhileng() {
+        return zhileng;
+    }
+
+    public void setZhileng(String zhileng) {
+        this.zhileng = zhileng;
+    }
+
+    public BingXiang() {
+    }
+
+    public BingXiang(String brand, String model, String color, double price, String meng, String zhileng) {
+        super(brand, model, color, price);
+        this.meng = meng;
+        this.zhileng = zhileng;
+    }
+
+    @Override
+    public String toString() {
+        return "这款冰箱的品牌为："+getBrand()+"，\n型号为："+getModel()+"，\n颜色为："+getColor()+
+                "，\n售价为："+getPrice()+"，\n门款式为："+meng+"，\n制冷方式为："+zhileng;
+    }
+}
+```
+
+
+
+```java
+public class XiYiJi extends DianQi{
+    /*
+    电机类型、洗涤容量
+     */
+    private String liexin;
+    private double rongliang;
+
+    public String getLiexin() {
+        return liexin;
+    }
+
+    public void setLiexin(String liexin) {
+        this.liexin = liexin;
+    }
+
+    public double getRongliang() {
+        return rongliang;
+    }
+
+    public void setRongliang(double rongliang) {
+        this.rongliang = rongliang;
+    }
+
+    public XiYiJi() {
+    }
+
+    public XiYiJi(String brand, String model, String color, double price, String liexin, double rongliang) {
+        super(brand, model, color, price);
+        this.liexin = liexin;
+        this.rongliang = rongliang;
+    }
+
+    @Override
+    public String toString() {
+        return "这款洗衣机的品牌为："+getBrand()+"，型号为："+getModel()+"，颜色为："+getColor()+
+                "，售价为："+getPrice()+"，电机类型为："+liexin+"，洗涤容量为："+rongliang;
+    }
+}
+```
+
+
+
+```java
+public class DianShi extends DianQi{
+    /*
+    屏幕尺寸、分辨率
+     */
+    private double chicun;
+    private double fengbinalv;
+
+    public double getChicun() {
+        return chicun;
+    }
+
+    public void setChicun(double chicun) {
+        this.chicun = chicun;
+    }
+
+    public double getFengbinalv() {
+        return fengbinalv;
+    }
+
+    public void setFengbinalv(double fengbinalv) {
+        this.fengbinalv = fengbinalv;
+    }
+
+    public DianShi() {
+    }
+
+    public DianShi(String brand, String model, String color, double price, double chicun, double fengbinalv) {
+        super(brand, model, color, price);
+        this.chicun = chicun;
+        this.fengbinalv = fengbinalv;
+    }
+
+    @Override
+    public String toString() {
+        return "这款电视的品牌为："+getBrand()+"，型号为："+getModel()+"，颜色为："+getColor()+
+                "，售价为："+getPrice()+"，屏幕尺寸为："+chicun+"，分辨率为："+fengbinalv;
+    }
+}
+```
+
+
+
+```java
+public class Test {
+    public static void main(String[] args) {
+        DianShi dianshi = new DianShi("QWER","DS1054","黑色",
+                1000,24,1024);
+        System.out.println(dianshi);
+    }
+}
+```
+
+
+
+## 题目2
+
+我们计划为一个动物园制作一套信息管理系统，根据与甲方沟通，我们归纳了有以下几种动物需要记录到系统中：
+
+```java
+鸟类：		 鹦鹉、猫头鹰、喜鹊
+哺乳类：	大象、狼、长颈鹿
+爬行类：	鳄鱼、蛇、乌龟
+```
+
+
+
+**要求：**
+
+请根据以上需求，使用“继承”设计出三层的类结构
+
+```java
+|--动物类
+    |--鸟类：
+        |--鹦鹉类
+        |--猫头鹰类
+        |--喜鹊类
+  
+    |--哺乳类：
+        |--大象类
+        |--狼类
+        |--长颈鹿类
+  
+    |--爬行类：
+        |--鳄鱼类
+        |--蛇类
+        |--乌龟类
+```
+
+作为父类的类都应该定义一些共性内容，每种子类也都有一些特定的内容。 重点是类的层次结构，类成员简单表示即可。
+
+
+
+**答案：**
+
+```java
+public class Animal {
+    /*
+    性别,年龄
+     */
+    private String sex;
+    private int age;
+
+    public String getSex() {
+        return sex;
+    }
+
+    public void setSex(String sex) {
+        this.sex = sex;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+
+    public Animal() {
+    }
+
+    public Animal(String sex, int age) {
+        this.sex = sex;
+        this.age = age;
+    }
+}
+```
+
+
+
+```java
+public class AnimalBirds extends Animal {
+    private String zhicun;
+
+    public String getZhicun() {
+        return zhicun;
+    }
+
+    public void setZhicun(String zhicun) {
+        this.zhicun = zhicun;
+    }
+
+    public AnimalBirds() {
+    }
+
+    public AnimalBirds(String sex, int age, String zhicun) {
+        super(sex, age);
+        this.zhicun = zhicun;
+    }
+}
+```
+
+
+
+```java
+public class AnimalBirdsMaoTouYing extends AnimalBirds {
+    private String yanse;
+
+    public String getYanse() {
+        return yanse;
+    }
+
+    public void setYanse(String yanse) {
+        this.yanse = yanse;
+    }
+
+    public AnimalBirdsMaoTouYing() {
+    }
+
+    public AnimalBirdsMaoTouYing(String sex, int age, String zhicun, String yanse) {
+        super(sex, age, zhicun);
+        this.yanse = yanse;
+    }
+}
+```
+
+
+
+```java
+public class AnimalBirdsXiQue extends AnimalBirds {
+    private String yumao;
+
+    public String getYumao() {
+        return yumao;
+    }
+
+    public void setYumao(String yumao) {
+        this.yumao = yumao;
+    }
+
+    public AnimalBirdsXiQue() {
+    }
+
+    public AnimalBirdsXiQue(String sex, int age, String zhicun, String yumao) {
+        super(sex, age, zhicun);
+        this.yumao = yumao;
+    }
+}
+```
+
+
+
+```java
+public class AnimalBirdsYingWu extends AnimalBirds {
+    private String jiaosheng;
+
+    public String getJiaosheng() {
+        return jiaosheng;
+    }
+
+    public void setJiaosheng(String jiaosheng) {
+        this.jiaosheng = jiaosheng;
+    }
+
+    public AnimalBirdsYingWu() {
+    }
+
+    public AnimalBirdsYingWu(String sex, int age, String zhicun, String jiaosheng) {
+        super(sex, age, zhicun);
+        this.jiaosheng = jiaosheng;
+    }
+}
+```
+
+
+
+```java
+public class AnimalMammalia extends Animal {
+    private String fanshi;
+
+    public String getFanshi() {
+        return fanshi;
+    }
+
+    public void setFanshi(String fanshi) {
+        this.fanshi = fanshi;
+    }
+
+    public AnimalMammalia() {
+    }
+
+    public AnimalMammalia(String sex, int age, String fanshi) {
+        super(sex, age);
+        this.fanshi = fanshi;
+    }
+}
+```
+
+
+
+```java
+public class AnimalMammaliaChangJingLu extends AnimalMammalia {
+    private String changdu;
+
+    public String getChangdu() {
+        return changdu;
+    }
+
+    public void setChangdu(String changdu) {
+        this.changdu = changdu;
+    }
+
+    public AnimalMammaliaChangJingLu() {
+    }
+
+    public AnimalMammaliaChangJingLu(String sex, int age, String fanshi, String changdu) {
+        super(sex, age, fanshi);
+        this.changdu = changdu;
+    }
+}
+```
+
+
+
+```java
+public class AnimalMammaliaDaXiang extends AnimalMammalia {
+    private String xiangya;
+
+    public String getXiangya() {
+        return xiangya;
+    }
+
+    public void setXiangya(String xiangya) {
+        this.xiangya = xiangya;
+    }
+
+    public AnimalMammaliaDaXiang() {
+    }
+
+    public AnimalMammaliaDaXiang(String sex, int age, String fanshi, String xiangya) {
+        super(sex, age, fanshi);
+        this.xiangya = xiangya;
+    }
+}
+```
+
+
+
+```java
+public class AnimalMammaliaLang extends AnimalMammalia {
+    private String maofa;
+
+    public String getMaofa() {
+        return maofa;
+    }
+
+    public void setMaofa(String maofa) {
+        this.maofa = maofa;
+    }
+
+    public AnimalMammaliaLang() {
+    }
+
+    public AnimalMammaliaLang(String sex, int age, String fanshi, String maofa) {
+        super(sex, age, fanshi);
+        this.maofa = maofa;
+    }
+}
+```
+
+
+
+```java
+public class AnimalReptilia extends Animal {
+    private String paixin;
+
+    public String getPaixin() {
+        return paixin;
+    }
+
+    public void setPaixin(String paixin) {
+        this.paixin = paixin;
+    }
+
+    public AnimalReptilia() {
+    }
+
+    public AnimalReptilia(String sex, int age, String paixin) {
+        super(sex, age);
+        this.paixin = paixin;
+    }
+}
+```
+
+
+
+```java
+public class AnimalReptiliaEYu extends AnimalReptilia {
+    private String weichang;
+
+    public String getWeichang() {
+        return weichang;
+    }
+
+    public void setWeichang(String weichang) {
+        this.weichang = weichang;
+    }
+
+    public AnimalReptiliaEYu() {
+    }
+
+    public AnimalReptiliaEYu(String sex, int age, String paixin, String weichang) {
+        super(sex, age, paixin);
+        this.weichang = weichang;
+    }
+}
+```
+
+
+
+```java
+public class AnimalReptiliaShe extends AnimalReptilia {
+    private String duxin;
+
+    public String getDuxin() {
+        return duxin;
+    }
+
+    public void setDuxin(String duxin) {
+        this.duxin = duxin;
+    }
+
+    public AnimalReptiliaShe() {
+    }
+
+    public AnimalReptiliaShe(String sex, int age, String paixin, String duxin) {
+        super(sex, age, paixin);
+        this.duxin = duxin;
+    }
+}
+```
+
+
+
+```java
+public class AnimalReptiliaWuGui extends AnimalReptilia {
+    private String kedaxiao;
+
+    public String getKedaxiao() {
+        return kedaxiao;
+    }
+
+    public void setKedaxiao(String kedaxiao) {
+        this.kedaxiao = kedaxiao;
+    }
+
+    public AnimalReptiliaWuGui() {
+    }
+
+    public AnimalReptiliaWuGui(String sex, int age, String paixin, String kedaxiao) {
+        super(sex, age, paixin);
+        this.kedaxiao = kedaxiao;
+    }
+}
+```
+
+
+
diff --git "a/28 \351\273\216\345\255\220\351\276\231/20230425 Java \347\273\203\344\271\240.md" "b/28 \351\273\216\345\255\220\351\276\231/20230425 Java \347\273\203\344\271\240.md"
new file mode 100644
index 0000000000000000000000000000000000000000..ecd35313282739968689f54ce58fac8d57f32449
--- /dev/null
+++ "b/28 \351\273\216\345\255\220\351\276\231/20230425 Java \347\273\203\344\271\240.md"	
@@ -0,0 +1,28 @@
+## 题目
+
+定义一个数学工具类，类名使用MyMath。
+
+要求：
+
+1. 该工具类不能有子类，不接受扩展。
+2. 该工具类不能被外界创建对象，构造方法需要私有化。
+3. 定义静态常量：PI，用来保存圆周率：3.14。
+4. 定义静态方法max，获取两个整数的较大值。
+5. 定义静态方法min，获取两个整数的较小值。
+
+
+
+```java
+final class MyMath {
+    public static final double PI = 3.14;
+
+    private MyMath() { /* compiled code */ }
+
+    public static int max(int a, int b) { /* compiled code */ }
+
+    public static int min(int a, int b) { /* compiled code */ }
+
+    public static void main(java.lang.String[] args) { /* compiled code */ }
+}
+```
+