From abb043731ce7fddd6d81acd01018143eef33fd67 Mon Sep 17 00:00:00 2001
From: Fuyuxinge <1876397977@qq.com>
Date: Thu, 2 Apr 2026 14:38:23 +0800
Subject: [PATCH] =?UTF-8?q?=E5=B0=86w4=E6=96=87=E4=BB=B6=E5=A4=B9=E5=8F=8A?=
 =?UTF-8?q?=E4=BA=94=E4=B8=AA=E6=96=87=E4=BB=B6=E4=B8=8A=E4=BC=A0?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 w4/Circle.java    | 23 +++++++++++++++++++++++
 w4/Rectangle.java | 34 ++++++++++++++++++++++++++++++++++
 w4/Shape.java     |  6 ++++++
 w4/ShapeUtil.java | 18 ++++++++++++++++++
 w4/Triangle.java  | 34 ++++++++++++++++++++++++++++++++++
 5 files changed, 115 insertions(+)
 create mode 100644 w4/Circle.java
 create mode 100644 w4/Rectangle.java
 create mode 100644 w4/Shape.java
 create mode 100644 w4/ShapeUtil.java
 create mode 100644 w4/Triangle.java

diff --git a/w4/Circle.java b/w4/Circle.java
new file mode 100644
index 0000000..8bc086c
--- /dev/null
+++ b/w4/Circle.java
@@ -0,0 +1,23 @@
+package w4;
+
+public class Circle extends Shape {
+    private double radius; 
+    public Circle() {}
+
+    public Circle(double radius) {
+        this.radius = radius;
+    }
+
+    @Override
+    public double getArea() {
+        return Math.PI * radius * radius;
+    }
+
+    public double getRadius() {
+        return radius;
+    }
+
+    public void setRadius(double radius) {
+        this.radius = radius;
+    }
+}
diff --git a/w4/Rectangle.java b/w4/Rectangle.java
new file mode 100644
index 0000000..ed7d813
--- /dev/null
+++ b/w4/Rectangle.java
@@ -0,0 +1,34 @@
+package w4;
+
+public class Rectangle extends Shape {
+    private double length; 
+    private double width;  
+
+    public Rectangle() {}
+
+    public Rectangle(double length, double width) {
+        this.length = length;
+        this.width = width;
+    }
+
+    @Override
+    public double getArea() {
+        return length * 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;
+    }
+}
diff --git a/w4/Shape.java b/w4/Shape.java
new file mode 100644
index 0000000..ee731dc
--- /dev/null
+++ b/w4/Shape.java
@@ -0,0 +1,6 @@
+package w4;
+
+public abstract class Shape {
+
+    public abstract double getArea();
+}
\ No newline at end of file
diff --git a/w4/ShapeUtil.java b/w4/ShapeUtil.java
new file mode 100644
index 0000000..e2c3b7e
--- /dev/null
+++ b/w4/ShapeUtil.java
@@ -0,0 +1,18 @@
+package w4;
+
+public class ShapeUtil {
+    public static void printArea(Shape shape) {
+        System.out.println("该图形的面积为：" + shape.getArea());
+    }
+
+    public static void main(String[] args) {
+        Shape circle = new Circle(5);
+        printArea(circle);
+
+        Shape rectangle = new Rectangle(4, 6);
+        printArea(rectangle);
+
+        Shape triangle = new Triangle(3, 8);
+        printArea(triangle);
+    }
+}
diff --git a/w4/Triangle.java b/w4/Triangle.java
new file mode 100644
index 0000000..82b475d
--- /dev/null
+++ b/w4/Triangle.java
@@ -0,0 +1,34 @@
+package w4;
+
+public class Triangle extends Shape {
+    private double base;  
+    private double height; 
+
+    public Triangle() {}
+
+    public Triangle(double base, double height) {
+        this.base = base;
+        this.height = height;
+    }
+
+    @Override
+    public double getArea() {
+        return (base * height) / 2;
+    }
+
+    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;
+    }
+}
\ No newline at end of file