我有以下java类：
Shape
Circle
Rectangle
Square
Shape是父类，Circle和Rectangle扩展了Shape和Square 扩展矩形。我正在尝试打印以下内容：
Circle with radius: 54.37, Centered at X: 9.29 Y: 0.17
Has area: 9287.38
Has circumference: 172.81
Rectangle with height: 70.38 and width: 59.78, Centered at X: 80.07 Y: 53.59
Has area: 4207.50
Has perimeter: 260.33
Square with side: 5.00, Centered at X: 9.00 Y: 3.73
Has area: 25.00
Has perimeter: 20.00
The output that I am getting is:
Circle with radius: 54.37, Centered at X: 9.29 Y: 0.17
Has area: 9287.38
Has circumference: 172.81
Rectangle with height: 70.38 and width: 59.78, Centered at X: 80.07 Y: 53.59
Has area: 4207.50
Has perimeter: 260.33
Square with side: 0.00, Centered at X: 92.88 Y: 44.97Square with side: 5.00, Rectangle
with height: 5.00 and width: 5.00
Has area: 0.00
Has perimeter: 0.00
Has area: 25.00
Has perimeter: 20.00
我意识到自从 Square 调用 super 我一直附加到我的 StringBuilder 解释了一些 Square 输出。我不 理解为什么边长为 0.00 的 Square 会发生，我是 不知道如何解决这个问题。关于更好的任何建议 更好的设计方式值得赞赏：这是代码：
import java.util.ArrayList;
public class Shape{
private double x;
private double y;
private StringBuilder str0 = new StringBuilder();
private StringBuilder str1 = new StringBuilder();
private StringBuilder str2 = new StringBuilder();
public Shape(double x, double y){
this.x = x;
this.y = y;
}
public static void main(String[] args){
System.out.println('\u000C');
ArrayList<Shape> list = new ArrayList<Shape>();
double x;
double y;
double radius;
double height;
double width;
double side;
for (int i = 0; i < 12; i++){
x = Math.random() * 100;
y = Math.random() * 100;
if (i % 3 == 0){
radius = Math.random() * 100;
Circle z = new Circle(x, y, radius);
list.add(z);
}else if (i % 3 == 1){
width = Math.random() * 100;
height = Math.random() * 100;
Rectangle z = new Rectangle(x, y, height, width);
list.add(z);
}else if (i % 3 == 5){
side = Math.random() * 100;
Square z = new Square(x, y, side);
list.add(z);
}
}
x = Math.random() * 100;
y = Math.random() * 100;
side = Math.random() * 100;
Square z = new Square(x, y, side);
list.add(z);
for(Shape s : list){
System.out.println(s.getStr0());
System.out.println(s.getStr1());
}
}
public String toString(){
String x = String.format("%.2f",this.x);
String y = String.format("%.2f",this.y);
return "Centered at X: " + x + " Y: " + y ;
}
public double calculateArea(){
return -999.99;
}
public double calculateCircumference(){
return -999.99;
}
public double calculatePerimeter(){
return -999.99;
}
public double getX(){
return this.x;
}
public void setX(double x){
this.x = x;
}
public double getY(){
return this.y;
}
public void setY(double y){
this.y = y;
}
public StringBuilder getStr0(){
return this.str0;
}
public void setStr0(StringBuilder str0){
this.str0 = str0;
}
public StringBuilder getStr1(){
return this.str1;
}
public void setStr1(StringBuilder str1){
this.str1 = str1;
}
public String findCircle(ArrayList<Shape> list){
String text="";
for (Shape s : list){
if (s instanceof Circle){
text+= s.getStr0() + "\n\n";
}
}
return text;
}
}
public class Rectangle extends Shape{
private double height;
private double width;
public Rectangle(double x, double y, double height, double width){
super(x, y);
this.height = height;
this.width = width;
String area = String.format("%.2f",this.calculateArea());
String perimeter = String.format("%.2f",this.calculatePerimeter());
getStr0().append(toString() + ", " + super.toString() );
System.out.println("99: " + getStr0());
getStr1().append("Has area: " + area + "\n");
getStr1().append("Has perimeter: " + perimeter + "\n");
}
public double calculateArea(){
return height * width;
}
public double calculatePerimeter(){
return 2 * height + 2 * width;
}
public String toString(){
String text = super.toString();
String height = String.format("%.2f",this.height);
String width = String.format("%.2f",this.width);
return "Rectangle with height: " + height + " and width: " + width;
}
}
public class Circle extends Shape{
private double radius;
public Circle(double x, double y, double radius){
super(x, y);
this.radius = radius;
String area = String.format("%.2f",this.calculateArea());
String circumference = String.format("%.2f",this.calculateCircumference());
getStr0().append(toString() + ", " + super.toString());
getStr1().append("Has area: " + area + "\n");
getStr1().append("Has circumference: " + circumference + "\n");
}
public double calculateCircumference(){
return 2 + Math.PI * radius;
}
public double calculateArea(){
return Math.PI * Math.pow(radius,2);
}
public String toString(){
String radius = String.format("%.2f",this.radius);
return "Circle with radius: " + radius;
}
}
public Square(double x, double y, double side){
super(x, y, side, side);
this.side = side;
String area = String.format("%.2f",this.calculateArea());
String perimeter = String.format("%.2f",this.calculatePerimeter());
System.out.println("1: " + toString());
System.out.println("2: " + getStr0());
System.out.println("3: " + getStr1());
getStr0().append(toString() + ", " + super.toString() );
getStr1().append("Has area: " + area + "\n");
getStr1().append("Has perimeter: " + perimeter + "\n");
System.out.println("4: " + toString());
System.out.println("5: " + getStr0());
System.out.println("6: " + getStr1());
}
public String toString(){
String side = String.format("%.2f",this.side);
return "Square with side: " + side ;
}
public double calculateArea(){
return side * side;
}
public double calculatePerimeter(){
return 4 * side;
}
}