diff --git a/java-base-projects b/java-base-projects
new file mode 160000
index 0000000000000000000000000000000000000000..976262af55c03230af664c96819d92c8f9870e0e
--- /dev/null
+++ b/java-base-projects
@@ -0,0 +1 @@
+Subproject commit 976262af55c03230af664c96819d92c8f9870e0e
diff --git a/java-base-projects-if/src/main/java/com/swpu/Zhang.java b/java-base-projects-if/src/main/java/com/swpu/Zhang.java
new file mode 100644
index 0000000000000000000000000000000000000000..e242da34544e015e7d7877fa690fc2a9dc33a480
--- /dev/null
+++ b/java-base-projects-if/src/main/java/com/swpu/Zhang.java
@@ -0,0 +1,10 @@
+package com.swpu;
+
+public class Zhang {
+    public static void main(String[] args) {
+        for(var i = 1;i<10;i++)
+        {
+            System.out.println("我是"+i);
+        }
+    }
+}
diff --git a/java-base-projects-list/src/main/java/com/swpu/Zhang.java b/java-base-projects-list/src/main/java/com/swpu/Zhang.java
new file mode 100644
index 0000000000000000000000000000000000000000..bd109a5efd552c910aa50861a5b3664d9738cce2
--- /dev/null
+++ b/java-base-projects-list/src/main/java/com/swpu/Zhang.java
@@ -0,0 +1,24 @@
+package com.swpu;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Map;
+
+public class Zhang {
+    public static void main(String[] args) {
+        Map map1 = new HashMap();
+        var list1 = new ArrayList<>();
+
+        list1.add("苹果");
+        list1.add("番茄");
+        list1.add("西蓝花");
+        list1.add("梨子");
+        list1.add("榴莲");
+     for(var i = 1;i<=list1.size();i++)
+        {
+            var data =list1.get( i - 1);
+            map1.put(data,i * 2+"$");
+        }
+        System.out.println(map1);
+    }
+}
diff --git a/java-base-projects-task/src/main/java/A1/Zhang1.java b/java-base-projects-task/src/main/java/A1/Zhang1.java
new file mode 100644
index 0000000000000000000000000000000000000000..09904cf90e8ab4b860df8fc881b22e8d5f46f3be
--- /dev/null
+++ b/java-base-projects-task/src/main/java/A1/Zhang1.java
@@ -0,0 +1,27 @@
+package A1;
+
+public class Zhang1 {
+    public static void main(String[] args) {
+
+    Zhang2 zhang2 = new Zhang2();
+
+        zhang2.helloWorldprint();
+
+        int num = zhang2.sum();
+
+        System.out.println(num);
+
+        int arr1=1;
+        int arr2=2;
+
+        int sum = zhang2.sum1(arr1,arr2);
+        System.out.println(sum);
+
+        String str1 = zhang2.srringmethod1();
+        System.out.println(str1);
+
+        String str2 = "String";
+        String str3= zhang2.srringmethod2(str2);
+        System.out.println(str3);
+    }
+}
diff --git a/java-base-projects-task/src/main/java/A1/Zhang2.java b/java-base-projects-task/src/main/java/A1/Zhang2.java
new file mode 100644
index 0000000000000000000000000000000000000000..d82abeb9bddde6a8b8abed5236cabe0eec26109a
--- /dev/null
+++ b/java-base-projects-task/src/main/java/A1/Zhang2.java
@@ -0,0 +1,27 @@
+package A1;
+
+public class Zhang2 {
+    public void helloWorldprint(){
+        System.out.println("hello world !");
+    }
+
+    public int sum(){
+        int arri1 = 1;
+        int arri2 = 2;
+        return arri1+arri2;
+    }
+    public int sum1(int num1,int num2)
+    {
+        return num1+num2;
+    }
+
+    public String srringmethod1()
+    {
+        return "String 无参数";
+    }
+    public String srringmethod2(String str)
+    {
+        return str+"有参数";
+    }
+
+}
diff --git a/java-base-projects-task/src/main/java/com/swpu/lvlTest/Test1.java b/java-base-projects-task/src/main/java/com/swpu/lvlTest/Test1.java
index dde7c68e2ec56437da619fde0d10c3344403e890..1e360472e7f1a35a0f975f276fb5ada849ea81e8 100644
--- a/java-base-projects-task/src/main/java/com/swpu/lvlTest/Test1.java
+++ b/java-base-projects-task/src/main/java/com/swpu/lvlTest/Test1.java
@@ -7,15 +7,15 @@ public class Test1 {
 
         Test2 test2 = new Test2();
         //
-        test2.helloWorldPrint();
+        test2.helloWorldPrint();//输出hello world
 
-        int num1 = test2.sum();
-        System.out.println("整型，无参数输出：" + num1);
+        int num1 = test2.sum();//5
+        System.out.println("整型，无参数输出：" + num1);//5
 
 
         int arr1 = 1;
         int arr2 = 1;
-        int sum = test2.sum1(arr1,arr2);
+        int sum = test2.sum1(arr1,arr2);//2
         System.out.println("整型，有参数输出：" + arr1 + " + " + arr2 + " = " + sum);
 
         String str1 = test2.stringMethod();