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+（1）父类Graphic图形
+
+- public double area()方法：返回0.0
+- public double perimeter()方法：返回0.0
+- public String getInfo()方法，返回图形面积和图形周长
+
+（2）子类Circle圆继承Graphic图形
+
+- 包含属性：radius，属性私有化
+- 包含get/set方法
+- 重写area()求面积方法
+- 重写perimeter()求周长方法
+- 重写getInfo()方法，返回圆的半径，面积和周长
+
+（3）子类矩形Rectangle继承Graphic图形
+
+- 包含属性：length、width，属性私有化
+- 包含get/set方法
+- 重写area()求面积方法
+- 重写perimeter()求周长方法
+- 重写getInfo()方法，返回长和宽，面积、周长信息
+
+（4）在测试类中，新建一个比较图形面积的方法，再建一个比较图形周长的方法，main方法中创建多个圆和矩形对象,再调用方法比较他们的周长或面积。
+
+### 父类Graphic图形
+
+~~~ java
+package Day20230508;
+
+public abstract class Graphic {
+
+        private String bijiao;
+
+        public Graphic(){}
+
+        public Graphic(String bijiao) {
+            this.bijiao = bijiao;
+        }
+
+        public String getbijiao() {
+            return bijiao;
+        }
+
+        public void setName(String bijiao) {
+            this.bijiao = bijiao;
+        }
+
+
+        public double area(){
+            return 0.0;
+        }
+
+        public double perimeter(){
+            return 0.0;
+        }
+
+        public String getInfo(){
+            return null;
+        }
+
+    }
+
+
+~~~
+
+### 子类Circle圆继承Graphic图形
+
+~~~ java
+package Day20230508;
+
+public class Circle extends Graphic{
+
+    private double radius;
+
+    public Circle(){}
+
+    public Circle(String bijiao, double radius) {
+        super(bijiao);
+        this.radius = radius;
+    }
+
+    public double getRadius() {
+        return radius;
+    }
+
+    public void setRadius(double radius) {
+        this.radius = radius;
+    }
+
+
+    @Override
+    public double area() {
+        return Math.PI*radius*radius;
+    }
+
+
+    @Override
+    public double perimeter() {
+        return 2*Math.PI*radius;
+    }
+
+
+    @Override
+    public String getInfo() {
+        return getbijiao()+"半径："+radius+"面积："+area()+"周长："+perimeter();
+    }
+}
+
+~~~
+
+### 子类矩形Rectangle继承Graphic图形
+
+~~~ java
+package Day20230508;
+
+public class Rectangle extends Graphic {
+    private double length;
+    private double width;
+
+    public Rectangle() {
+    }
+
+    public Rectangle(String bijiao, double length, double width) {
+        super(bijiao);
+        this.length = length;
+        this.width = width;
+    }
+
+    public Rectangle(double length, double width) {
+        this.length = length;
+        this.width = 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;
+    }
+    public double area(){
+        return length*width;
+    }
+    public double perimeter(){
+       return length*width*2;
+    }
+    public String getInfo(){
+        return  getbijiao()+"长："+length+"宽"+width+"面积："+area()+"周长："+perimeter();
+    }
+}
+
+~~~
+
+### 测试类
+
+~~~ java
+package Day20230508;
+
+public class Test {
+    private static void getArea(Graphic y1, Graphic y2) {
+        if(y1.area()>y2.area()){
+            System.out.println(y1.getbijiao()+"的面积大于"+y2.getbijiao());
+        }else{
+            System.out.println(y2.getbijiao()+"的面积大于"+y1.getbijiao());
+        }
+    }
+    public static void getPerimeter(Graphic a ,Graphic b){
+        if(a.perimeter()>b.perimeter()){
+            System.out.println(a.getbijiao()+"的周长大于"+b.getbijiao());
+        }else{
+            System.out.println(b.getbijiao()+"的周长大于"+a.getbijiao());
+        }
+    }
+
+
+    public static void main(String[] args) {
+        Graphic y1 = new Circle("圆形1",12);
+        System.out.println(y1.getInfo());
+        Graphic y2 = new Circle("圆形2",22);
+        System.out.println(y2.getInfo());
+
+        Graphic j1 = new Rectangle("矩形1",12,2);
+        System.out.println(j1.getInfo());
+        Graphic j2 = new Rectangle("矩形2",22,12);
+        System.out.println(j2.getInfo());
+
+        getArea(y1,y2);
+        getArea(j1,j2);
+        getPerimeter(y1,y2);
+        getPerimeter(j1,j2);
+    }
+
+
+
+}
+
+
+~~~
+