第十java上机作业.docVIP

第七章上级作业 7.1 public class Rectangle { double width=1; double height=1; String color=white; public Rectangle(){} public Rectangle(double width,double height,String color) { this.width=width; this.height=height; this.color=color; } public void setwidth(double width) { this.width=width; } public void setcolor(String color) { this.color=color; } public double getwidth() { return width; } public double getheight() { return height; } public double getArea() { return width*height; } public double getAPerimeter() { return 2*(width+height); } } class Test{ public static void main(String[] args) { Rectangle r1=new Rectangle(4,40,red); Rectangle r2=new Rectangle(3.5,35.9,red); r1.getArea(); r1.getAPerimeter(); r2.getArea(); r2.getAPerimeter(); System.out.println(r1.getArea()); System.out.println(r1.getAPerimeter()); System.out.println(r2.getArea()); System.out.println(r2.getAPerimeter()); } } 输出结果： 160.0 88.0 125.64999999999999 78.8 7.1 public class Rectangle { private double width = 1; private double height = 1; private String color = white; public static void main(String[] args) { Rectangle r1 = new Rectangle(4,40); r1.setColor(red); Rectangle r2 = new Rectangle(3.5,35.9); r2.setColor(red); System.out.println(r1.toString()); System.out.println(r2.toString()); } public Rectangle(){ this(1.0,1.0); } public Rectangle(double width,double height){ this.width = width; this.height = height; color = white; } public double getWidth() { return width; } public void setWidth(double width) { this.width = width; } public double getHeight() { return height; } public void setHeight(double height) { this.height = height; } public String getColor() { return color; } public void setColor(String color) { this.color = color; } public double getArea(){ return width*height; } public double getPerimeter(){ return (width + height)*2; } public String toString(){ String output = ; output = 矩形的属性:\n\t宽