From df553a9eed0f8c261c3bbffeae08cc7b6c7d105a Mon Sep 17 00:00:00 2001
From: LiuZihan <1353843969@qq.com>
Date: Wed, 1 Apr 2026 22:24:59 +0800
Subject: [PATCH] =?UTF-8?q?=E4=B8=8A=E4=BC=A0=E6=96=87=E4=BB=B6=E8=87=B3?=
 =?UTF-8?q?=20'w4'?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 w4/Circle.java    | 12 ++++++++++++
 w4/Rectangle.java | 14 ++++++++++++++
 w4/Shape.java     |  3 +++
 w4/ShapeTest.java | 18 ++++++++++++++++++
 w4/ShapeUtil.java |  5 +++++
 5 files changed, 52 insertions(+)
 create mode 100644 w4/Circle.java
 create mode 100644 w4/Rectangle.java
 create mode 100644 w4/Shape.java
 create mode 100644 w4/ShapeTest.java
 create mode 100644 w4/ShapeUtil.java

diff --git a/w4/Circle.java b/w4/Circle.java
new file mode 100644
index 0000000..584068d
--- /dev/null
+++ b/w4/Circle.java
@@ -0,0 +1,12 @@
+public class Circle extends Shape {
+    private double radius;
+
+    public Circle(double radius) {
+        this.radius = radius;
+    }
+
+    @Override
+    public double getArea() {
+        return Math.PI * radius * radius;
+    }
+}
\ No newline at end of file
diff --git a/w4/Rectangle.java b/w4/Rectangle.java
new file mode 100644
index 0000000..90cb267
--- /dev/null
+++ b/w4/Rectangle.java
@@ -0,0 +1,14 @@
+public class Rectangle extends Shape {
+    private double width;
+    private double height;
+
+    public Rectangle(double width, double height) {
+        this.width = width;
+        this.height = height;
+    }
+
+    @Override
+    public double getArea() {
+        return width * height;
+    }
+}
\ No newline at end of file
diff --git a/w4/Shape.java b/w4/Shape.java
new file mode 100644
index 0000000..e1a96c5
--- /dev/null
+++ b/w4/Shape.java
@@ -0,0 +1,3 @@
+public abstract class Shape {
+    public abstract double getArea();
+}
\ No newline at end of file
diff --git a/w4/ShapeTest.java b/w4/ShapeTest.java
new file mode 100644
index 0000000..136a171
--- /dev/null
+++ b/w4/ShapeTest.java
@@ -0,0 +1,18 @@
+public class ShapeTest {
+    public static void main(String[] args) {
+        // 创建各个图形对象
+        Shape c = new Circle(5);
+        Shape r = new Rectangle(4,6);
+        Shape t = new Triangle(3,4);
+
+        //统一调用工具打印面积
+        System.out.print("圆形：");
+        ShapeUtil.printArea(c);
+
+        System.out.print("矩形：");
+        ShapeUtil.printArea(r);
+
+        System.out.print("三角形：");
+        ShapeUtil.printArea(t);
+    }
+}
\ No newline at end of file
diff --git a/w4/ShapeUtil.java b/w4/ShapeUtil.java
new file mode 100644
index 0000000..37e32e3
--- /dev/null
+++ b/w4/ShapeUtil.java
@@ -0,0 +1,5 @@
+public class ShapeUtil {
+    public static void printArea(Shape shape){
+        System.out.println("图形面积：" + shape.getArea());
+    }
+}
\ No newline at end of file