diff --git a/work/com/java/minxi/java_20240420/Demo1.java b/work/com/java/minxi/java_20240420/Demo1.java
new file mode 100644
index 0000000000000000000000000000000000000000..5720591fc6b9d6afcf3774e7f4db7817c8111e72
--- /dev/null
+++ b/work/com/java/minxi/java_20240420/Demo1.java
@@ -0,0 +1,97 @@
+package com.java.minxi.java_20240420;
+
+public class Demo1 {
+        String brand;
+        int weight;
+        String type;
+
+
+        public static class Demo2 {
+            String brand;
+            String type;
+
+            public Demo2(){
+
+            }
+
+            public Demo2(String brand,String type){
+                this.brand=brand;
+                this.type=type;
+            }
+
+            public void refrigeration(){
+                System.out.println(this.brand+this.type+"正在"+"制冷");
+            }
+            public void heating(){
+                System.out.println(this.brand+this.type+"正在"+"制热");
+            }
+
+            public void setBrand(String brand){
+                this.brand=brand;
+            }
+
+            public void setType(String type){
+                this.type=type;
+            }
+
+            public String getBrand(){
+                return brand;
+            }
+
+            public String getType(){
+                return type;
+            }
+
+
+
+
+
+        }
+
+        public void clothes(){
+            System.out.println(this.brand+this.type+"正在洗衣服");
+        }
+
+        public void cooking(){
+            System.out.println(this.brand+this.type+"正在炖鸡汤");
+        }
+
+        public void weigh(){
+            System.out.println(this.brand+this.type+"有"+this.weight+"kg重");
+        }
+
+        public void setBrand(String brand){
+            this.brand=brand;
+        }
+        public void setWeight(int weight){
+            this.weight=weight;
+        }
+        public void setType(String type){
+            this.type=type;
+        }
+        public String getBrand(){
+            return brand;
+        }
+
+        public int getWeight(){
+            return weight;
+        }
+
+        public String getType(){
+            return type;
+        }
+
+        public Demo1(){
+
+        }
+
+        public Demo1(String brand, int weight, String type){
+            this.brand=brand;
+            this.weight=weight;
+            this.type=type;
+        }
+
+
+    }
+
+
diff --git a/work/com/java/minxi/java_20240420/Demo3.java b/work/com/java/minxi/java_20240420/Demo3.java
new file mode 100644
index 0000000000000000000000000000000000000000..c1d7c4458bc2b59ad1c53c89018478631530c006
--- /dev/null
+++ b/work/com/java/minxi/java_20240420/Demo3.java
@@ -0,0 +1,64 @@
+package com.java.minxi.java_20240420;
+
+public class Demo3 {
+
+        public static void main(String[] args) {
+            Demo1 wash=new Demo1();
+            wash.brand="海尔";
+            wash.type="洗衣机";
+            wash.clothes();
+
+            Demo1 cook=new Demo1();
+            cook.brand="美的";
+            cook.type="电饭煲";
+            cook.cooking();
+
+            Demo1 wei=new Demo1();
+            wei.brand="海尔";
+            wei.type="冰箱";
+            wei.weight=50;
+            wei.weigh();
+
+            Demo1.Demo2 dj=new Demo1.Demo2();
+            dj.brand="大金";
+            dj.type="空调";
+            dj.refrigeration();
+
+
+
+            Demo1 wash1=new Demo1();
+            wash1.setBrand("海尔");
+            wash1.setType("洗衣机");
+            wash1.clothes();
+
+            Demo1 cook1=new Demo1();
+            cook1.setBrand("美的");
+            cook1.setType("电饭煲");
+            cook1.cooking();
+
+            Demo1 wei1=new Demo1();
+            wei1.setBrand("海尔");
+            wei1.setType("冰箱");
+            wei1.weight=50;
+            wei.weigh();
+
+            Demo1.Demo2 dj1=new Demo1.Demo2();
+            dj1.setBrand("大金");
+            dj1.setType("空调");
+
+            Demo1 wash2=new Demo1("海尔",75,"洗衣机");
+            wash2.clothes();
+
+            Demo1 cook2=new Demo1("美的",2,"电饭锅");
+            cook2.cooking();
+
+            Demo1 wei2=new Demo1("海尔",50,"冰箱");
+            wei2.weigh();
+
+            Demo1.Demo2 dj2=new Demo1.Demo2("大金","空调");
+            dj.refrigeration();
+
+        }
+    }
+
+