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+## 多态练习
+
+### 1、图形
+
+（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。
+
+~~~java
+package aaa;
+
+import java.util.Scanner;
+
+public class Graphic {
+    public double area(){
+        return 0.0;
+    }
+    public double perimeter(){
+        return 0.0;
+    }
+    public String getInfo(){
+        return "图形面积为"+area()+"图形周长为"+perimeter();
+    }
+}
+class Circle extends Graphic{
+    private int radius;
+
+    public Circle(){}
+    public Circle(int radius) {
+        this.radius = radius;
+    }
+
+    public int getRadius() {
+        return radius;
+    }
+    public void setRadius(int radius) {
+        this.radius = radius;
+    }
+
+    @Override
+    public double area() {
+        return 3.14*radius*radius;
+    }
+
+    @Override
+    public double perimeter() {
+        return 2*3.14*radius;
+    }
+
+    @Override
+    public String getInfo() {
+        return "圆的半径为"+radius+super.getInfo();
+    }
+}
+class Rectangle extends Graphic{
+    private int length;
+    private int width;
+
+    public Rectangle(){}
+    public Rectangle(int length, int width) {
+        this.length = length;
+        this.width = width;
+    }
+
+    public int getLength() {
+        return length;
+    }
+    public void setLength(int length) {
+        this.length = length;
+    }
+    public int getWidth() {
+        return width;
+    }
+    public void setWidth(int width) {
+        this.width = width;
+    }
+
+    @Override
+    public double area() {
+        return length*width;
+    }
+
+    @Override
+    public double perimeter() {
+        return 2*length+2*width;
+    }
+
+    @Override
+    public String getInfo() {
+        return "长为"+length+"宽为"+width+super.getInfo();
+    }
+}
+class test{
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+        Circle A= new Circle();
+        System.out.println("请输入第一个圆的半径");
+        A.setRadius(scanner.nextInt());
+        Circle B= new Circle();
+        System.out.println("请输入第二个圆的半径");
+        B.setRadius(scanner.nextInt());
+        Rectangle C = new Rectangle();
+        System.out.println("请输入矩形1的长");
+        C.setLength(scanner.nextInt());
+        Rectangle D = new Rectangle();
+        System.out.println("请输入矩形2的长");
+        D.setLength(scanner.nextInt());
+        System.out.println("请输入矩形1的宽");
+        C.setWidth(scanner.nextInt());
+        System.out.println("请输入矩形2的宽");
+        D.setWidth(scanner.nextInt());
+        System.out.println("圆1:\n" +A.getInfo());
+        System.out.println("圆2:\n" +B.getInfo());
+        System.out.println();
+        System.out.println("矩形1:\n" +C.getInfo());
+        System.out.println("矩形2:\n" + D.getInfo());
+        System.out.println();
+
+    }
+}
+
+
+~~~
+