上传文件至 'w5-黄志楷-202506050318'

w5-黄志楷-202506050318/Circle.java

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+package w5;
+
+public class Circle extends Shape{
+    Circle(double l,double h){
+        super(l,h);
+    }
+    @Override
+    protected double getArea(){
+        area=Math.PI*l*h;
+        return area;
+    } 
+}

w5-黄志楷-202506050318/Main.java

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+package w5;
+
+public class Main {
+    ShapeUtil st;
+    public static void main(String[] args) {
+        ShapeUtil st=new ShapeUtil();
+        Shape circle=new Circle(9, 9);
+        Shape triangle=new Triangle(9, 2);
+        Shape retangle=new Retangle(9, 4);
+        st.printArea(circle);
+        st.printArea(triangle);
+        st.printArea(retangle);
+    }
+}

w5-黄志楷-202506050318/Retangle.java

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+package w5;
+
+public class Retangle extends Shape{
+    Retangle(double l,double h){
+        super(l,h);
+    }
+    @Override
+    protected double getArea(){
+        area=l*h;
+        return area;
+    }
+}

w5-黄志楷-202506050318/Shape.java

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+package w5;
+abstract class Shape{
+    protected double l;
+    protected double h;
+    protected double area;
+    public Shape(double l,double h){
+        this.l=l;
+        this.h=h;
+        this.area=getArea();
+    }
+    protected abstract double getArea();
+}

w5-黄志楷-202506050318/ShapeUtil.java

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+package w5;
+
+public class ShapeUtil {
+    
+    public static void printArea(Shape shape){
+        System.out.println(shape.area);
+    }   
+}