W4-高钰铎-202506050304

public class Circle extends Shape {.txt

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+public class Circle extends Shape {
+    private double radius;
+
+    public Circle(double radius) {
+        this.radius = radius;
+    }
+
+    @Override
+    public double getArea() {
+        return Math.PI * radius * radius;
+    }
+}

public class Rectangle extends Shap.txt

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+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;
+    }
+}

public class ShapeUtil {.txt

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+public class ShapeUtil {
+    public static void printArea(Shape shape) {
+        System.out.println("图形面积 = " + shape.getArea());
+    }
+}

public class Test {.txt

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+public class Test {
+    public static void main(String[] args) {
+        Shape circle = new Circle(2);
+        Shape rectangle = new Rectangle(3, 4);
+        Shape triangle = new Triangle(4, 5);
+
+        ShapeUtil.printArea(circle);
+        ShapeUtil.printArea(rectangle);
+        ShapeUtil.printArea(triangle);
+    }
+}