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65 lines
1.8 KiB
65 lines
1.8 KiB
/**
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* 课后练习w5 基础题（必做）
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* 需求：
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* 1. 定义Shape类，包含draw()方法
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* 2. 子类Circle、Rectangle重写draw()方法
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* 3. 编写drawShape(Shape s)方法，调用其draw()
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* 4. 在main方法中测试多态调用
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*/
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// 父类Shape：定义图形的通用行为
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class Shape {
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/**
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* 绘制图形的方法，供子类重写
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*/
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public void draw() {
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System.out.println("绘制通用图形");
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}
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}
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// 子类Circle：继承Shape，重写draw()
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class Circle extends Shape {
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@Override
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public void draw() {
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System.out.println("绘制圆形 ⭕");
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}
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}
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// 子类Rectangle：继承Shape，重写draw()
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class Rectangle extends Shape {
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@Override
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public void draw() {
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System.out.println("绘制矩形 🟦");
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}
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}
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// 主类：包含工具方法和main测试方法
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public class ShapeTest {
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/**
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* 统一绘制图形的方法，体现多态
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* @param s 任意Shape类型的图形对象
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*/
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public static void drawShape(Shape s) {
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s.draw(); // 自动调用对应子类的draw()方法
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}
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public static void main(String[] args) {
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// 1. 创建不同图形对象
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Shape circle = new Circle();
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Shape rectangle = new Rectangle();
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Shape shape = new Shape();
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// 2. 调用统一方法测试多态
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System.out.println("===== 图形绘制测试 =====");
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drawShape(shape);
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drawShape(circle);
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drawShape(rectangle);
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// 3. 数组遍历测试（额外补充，体现多态数组用法）
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System.out.println("\n===== 数组遍历测试 =====");
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Shape[] shapes = {new Circle(), new Rectangle(), new Shape()};
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for (Shape s : shapes) {
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drawShape(s);
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}
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}
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}
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