From b5af878bf9fd3922a61c2e1c2349db1b53b171f1 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E8=94=A1=E5=98=89=E4=B9=90?= Date: Mon, 8 May 2023 22:55:18 +0800 Subject: [PATCH] =?UTF-8?q?=E7=AC=AC=E5=8D=81=E4=B8=89=E6=AC=A1=E4=BD=9C?= =?UTF-8?q?=E4=B8=9A?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- ...11\346\254\241\344\275\234\344\270\232.md" | 139 ++++++++++++++++++ 1 file changed, 139 insertions(+) create mode 100644 "13 \350\224\241\345\230\211\344\271\220/\347\254\254\345\215\201\344\270\211\346\254\241\344\275\234\344\270\232.md" diff --git "a/13 \350\224\241\345\230\211\344\271\220/\347\254\254\345\215\201\344\270\211\346\254\241\344\275\234\344\270\232.md" "b/13 \350\224\241\345\230\211\344\271\220/\347\254\254\345\215\201\344\270\211\346\254\241\344\275\234\344\270\232.md" new file mode 100644 index 0000000..97f82a5 --- /dev/null +++ "b/13 \350\224\241\345\230\211\344\271\220/\347\254\254\345\215\201\344\270\211\346\254\241\344\275\234\344\270\232.md" @@ -0,0 +1,139 @@ +### 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(); + + } +} +``` \ No newline at end of file -- Gitee