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diff --git a/w5/Main.java b/w5/Main.java
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+++ b/w5/Main.java
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+import java.util.Arrays;
+
+// ========== 1. 抽象类 Shape ==========
+abstract class Shape {
+    protected String name;
+    
+    public Shape(String name) {
+        this.name = name;
+    }
+    
+    public String getName() {
+        return name;
+    }
+    
+    public void setName(String name) {
+        this.name = name;
+    }
+    
+    public abstract double getArea();
+    
+    @Override
+    public String toString() {
+        return name + " - 面积: " + String.format("%.2f", getArea());
+    }
+}
+
+// ========== 2. 圆形类 ==========
+class Circle extends Shape {
+    private double radius;
+    
+    public Circle(String name, double radius) {
+        super(name);
+        this.radius = radius;
+    }
+    
+    public double getRadius() {
+        return radius;
+    }
+    
+    public void setRadius(double radius) {
+        this.radius = radius;
+    }
+    
+    @Override
+    public double getArea() {
+        return Math.PI * radius * radius;
+    }
+}
+
+// ========== 3. 长方形类 ==========
+class Rectangle extends Shape {
+    private double length;
+    private double width;
+    
+    public Rectangle(String name, double length, double width) {
+        super(name);
+        this.length = length;
+        this.width = width;
+    }
+    
+    public double getLength() {
+        return length;
+    }
+    
+    public void setLength(double length) {
+        this.length = length;
+    }
+    
+    public double getWidth() {
+        return width;
+    }
+    
+    public void setWidth(double width) {
+        this.width = width;
+    }
+    
+    @Override
+    public double getArea() {
+        return length * width;
+    }
+}
+
+// ========== 4. 三角形类 ==========
+class Triangle extends Shape {
+    private double base;
+    private double height;
+    
+    public Triangle(String name, double base, double height) {
+        super(name);
+        this.base = base;
+        this.height = height;
+    }
+    
+    public double getBase() {
+        return base;
+    }
+    
+    public void setBase(double base) {
+        this.base = base;
+    }
+    
+    public double getHeight() {
+        return height;
+    }
+    
+    public void setHeight(double height) {
+        this.height = height;
+    }
+    
+    @Override
+    public double getArea() {
+        return (base * height) / 2;
+    }
+}
+
+// ========== 5. 工具类 ==========
+class ShapeUtil {
+    
+    public static void printArea(Shape shape) {
+        if (shape == null) {
+            System.out.println("形状不能为空");
+            return;
+        }
+        System.out.println(shape.toString());
+    }
+    
+    public static void printAreas(Shape[] shapes) {
+        System.out.println("=== 形状面积列表 ===");
+        for (Shape shape : shapes) {
+            printArea(shape);
+        }
+        System.out.println("==================");
+    }
+}
+
+// ========== 6. 主类（必须是public，且与文件名相同）==========
+public class Main {
+    public static void main(String[] args) {
+        // 创建各种形状
+        Circle circle = new Circle("圆形", 5.0);
+        Rectangle rectangle = new Rectangle("长方形", 4.0, 6.0);
+        Triangle triangle = new Triangle("三角形", 3.0, 4.0);
+        
+        // 使用工具类打印面积
+        System.out.println("单个形状面积打印：");
+        ShapeUtil.printArea(circle);
+        ShapeUtil.printArea(rectangle);
+        ShapeUtil.printArea(triangle);
+        
+        // 多态演示：批量处理
+        System.out.println("\n批量处理（多态演示）：");
+        Shape[] shapes = {circle, rectangle, triangle};
+        ShapeUtil.printAreas(shapes);
+    }
+}
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