diff --git a/5.1.3.txt b/5.1.3.txt
new file mode 100644
index 0000000..8d77d38
--- /dev/null
+++ b/5.1.3.txt
@@ -0,0 +1,9 @@
+/**
+ * 矩形：重写draw()方法
+ */
+public class Rectangle extends Shape {
+    @Override
+    public void draw() {
+        System.out.println("绘制矩形 🟦");
+    }
+}
\ No newline at end of file
diff --git a/5.1.4.txt b/5.1.4.txt
new file mode 100644
index 0000000..2599244
--- /dev/null
+++ b/5.1.4.txt
@@ -0,0 +1,19 @@
+/**
+ * 测试类：包含drawShape()方法，统一调用draw()
+ */
+public class TestShape {
+    // 统一绘制图形的方法
+    public static void drawShape(Shape s) {
+        s.draw(); // 多态调用：执行子类重写的draw()
+    }
+
+    public static void main(String[] args) {
+        // 创建不同图形对象
+        Shape circle = new Circle();
+        Shape rectangle = new Rectangle();
+        
+        // 调用统一方法绘制
+        drawShape(circle);
+        drawShape(rectangle);
+    }
+}
\ No newline at end of file
diff --git a/5.2.1.txt b/5.2.1.txt
new file mode 100644
index 0000000..a0601e0
--- /dev/null
+++ b/5.2.1.txt
@@ -0,0 +1,6 @@
+/**
+ * 交通工具抽象类：定义抽象方法run()
+ */
+public abstract class Vehicle {
+    public abstract void run();
+}
\ No newline at end of file
diff --git a/新建 文本文档.txt b/新建 文本文档.txt
new file mode 100644
index 0000000..d8f58aa
--- /dev/null
+++ b/新建 文本文档.txt	
@@ -0,0 +1,9 @@
+/**
+ * 图形父类：定义draw()方法规范
+ */
+public class Shape {
+    // 绘制方法（父类默认实现）
+    public void draw() {
+        System.out.println("绘制基础图形");
+    }
+}
\ No newline at end of file
diff --git a/无标题.txt b/无标题.txt
new file mode 100644
index 0000000..bea5b1e
--- /dev/null
+++ b/无标题.txt
@@ -0,0 +1,9 @@
+/**
+ * 圆形：重写draw()方法
+ */
+public class Circle extends Shape {
+    @Override
+    public void draw() {
+        System.out.println("绘制圆形 ⭕");
+    }
+}
\ No newline at end of file