JavaMyShape抽象类面向对象
Java MyShape抽象类（面向对象）运行结果：（参考代码一）1.MyCircle 类public class MyCircle extends Shapeprivate float radius;public MyCircle(int width, int height) super(width, height);radius=width/2;this.x=3;this.y=45;/ TODO Auto-generated constructor stubOverridepublic float getArea() / TODO Auto-generated method stubreturn (float) (Math.PI*radius*radius);Overridepublic float getGirth() / TODO Auto-generated method stubreturn (float) (Math.PI*2*radius);public String toString()return "这是圆，周长是："+getGirth()+" 面积是："+getGirth();2，MyEllipse类public class MyEllipse extends Shapepublic MyEllipse(int width, int height) super(width, height);this.x=3;this.y=85;/ TODO Auto-generated constructor stubOverridepublic float getArea() / TODO Auto-generated method stubreturn (float) (Math.PI *(width+height)/4*(width+height)/4);Overridepublic float getGirth() / TODO Auto-generated method stubreturn (float) (float)2*Math.PI*(width+height)/2);public String toString()return "这是一个椭圆，周长是："+getGirth()+" 面积是："+getGirth();3 MyRectangle类public class MyRectangle extends Shapepublic MyRectangle(int width, int height) super(width, height);this.x=3;this.y=5;/ TODO Auto-generated constructor stubOverridepublic float getArea() / TODO Auto-generated method stubreturn width*height;Overridepublic float getGirth() / TODO Auto-generated method stubreturn 2*width*height;public String toString()return "这是矩形，周长是："+getGirth()+" 面积是："+getGirth();4.MyTriangle类public class MyTriangle extends Shapepublic MyTriangle(int width, int height) super(width, height);this.x=3;this.y=125;/ TODO Auto-generated constructor stubOverridepublic float getArea() / TODO Auto-generated method stubreturn (float) (width+height+Math.sqrt(width*width+height*height);Overridepublic float getGirth() / TODO Auto-generated method stubreturn width*height*1/2;public String toString()return "这个是三角形，周长是："+getGirth()+" 面积是："+getGirth();5 Shape抽象类public abstract class Shape public int width;public int height;public int x;public int y;public Shape(int width, int height)this.width=width;this.height=height;public abstract float getArea();public abstract float getGirth();6.Test类import java.awt.Graphics;import javax.swing.JFrame;import javax.swing.JPanel;public class Test extends JPanelprivate Shape circle;private Shape ellipse;private Shape triangle;private Shape rectangle;public Test()JFrame f=new JFrame("形状家族");circle=new MyCircle(10,10);ellipse=new MyEllipse(10,10);triangle=new MyTriangle(10,10);rectangle=new MyRectangle(10,10);f.setVisible(true);f.add(this);f.setSize(600,600);f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);/* * param args */public static void main(String args) / TODO Auto-generated method stubnew Test();Overrideprotected void paintComponent(Graphics g)int xPoints=new inttriangle.x,triangle.x+20,triangle.x;int yPoints=new inttriangle.y,triangle.y,triangle.y-20;g.drawOval(circle.x, circle.y, circle.width, circle.height);g.drawString(circle.toString(), circle.x+25, circle.y+9);g.drawOval(ellipse.x,ellipse.y, ellipse.width, ellipse.height);g.drawString(ellipse.toString(), ellipse.x+25, ellipse.y+9);g.drawPolygon(xPoints, yPoints, 3);g.drawString(triangle.toString(), triangle.x+25, triangle.y+9);g.drawRect(rectangle.x, rectangle.y, rectangle.width, rectangle.height);g.drawString(rectangle.toString(), rectangle.x+25, rectangle.y+9);效果：（参考代码二）1. 源代码：1.1 Myshapepackage course.java.shape;public abstract class MyShape public abstract float area(); public abstract float perimeter(); public abstract void display();1.2 MyRectanglepackage course.java.shape;public class MyRectangle extends MyShapeprivate float width,height; public MyRectangle(float width, float height) super();this.width = width;this.height = height; public float area() return width*height; public float perimeter() return 2*(width+height); public void display() System.out.println("矩形"); System.out.println("长：" + width + ", 宽：" + height); 1.3 MyCirclepackage course.java.shape;public class MyCircle extends MyShapeprivate final float PI=3.14f; private float radius; public MyCircle(float radius) super();this.radius = radius; public float area() return PI*radius*radius; public float perimeter() return 2*PI*radius;
