{
private:
double Length
double Width
public:
Rectangle(){Length=1Width=1}
Rectangle(double len, double w){Length=lenWidth=w}
double Perimeter(){return 2*(Length+Width)}
double Area(){return (Length*Width)}
void show(char *buf){sprintf(buf,"%矩形长=%f,宽=%f", Length, Width)}
}//读写矩形的长宽的方法你就自己写吧，很简单的int main(){ Rectangle test1(4,7) Rectangle test1(2,8)}
// 矩形public class RectangleDemo {
public static void main(String[] args) {
RectangleDemo demo = new RectangleDemo(12, 32)
System.out.println(demo.getPerimeter())
System.out.println(demo.getArea())
demo = new RectangleDemo()
System.out.println(demo.getArea())
System.out.println(demo.getPerimeter())
demo.setHeight(50)
demo.setWidth(30)
System.out.println(demo.getArea())
System.out.println(demo.getPerimeter())
}
// 求周
public double getPerimeter() {
return (height + width) * 2
}
// 求面积
public double getArea() {
return height * width
}
public RectangleDemo(double height, double width) {
this.height = height
this.width = width
}
public RectangleDemo() {
this.height = 10
this.width = 10
}
private double height// 高度
private double width// 宽度
public double getHeight() {
return height
}
public void setHeight(double height) {
this.height = height
}
public double getWidth() {
return width
}
public void setWidth(double width) {
this.width = width
}
}
编写矩形类RectangleJava程序矩形类两数据员别rLength宽rWidth通getLength()、getWidth()、getArea()别查看矩形、宽面积通setLength()setWidth()重新设置矩形宽
public class Rect {private double length//矩形的长
private double width//矩形的宽
public Rect() {}//默认构造器
public Rect(double length,double width) {
this.length = length
this.width = width
}
/**
* 取得矩形的面积
* */
public double getArea(){
return this.getLength() * this.getWidth()
}
/**
* 取得矩形的周长
* */
public double getPerimeter(){
return (this.getLength() + this.getWidth()) * 2
}
/**
* 取得矩形的面积，需传入矩形长与宽
* */
public double getArea(double length,double width){
return length * width
}
/**
* 取得矩形的周长，需传入矩形长与宽
* */
public double getPerimeter(double length,double width){
return (length + width) * 2
}
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
}
}
