问题描述
我在使TestPolygon.java正确运行方面遇到问题. "//构造函数,可创建四个不等于默认值或彼此不等于默认值的多边形.Polygon [] P_array = {new Polygon(10,5.0,1.0,3.0),new Polygon(6,3,2 ,5),新的Polygon(4,11,4,3),新的Polygon(5,12,6,7)};我的代码行不断对每个新语句返回错误,并指出没有合适的构造函数为Polygon(int,double,double,double)找到.图片已附加.
I am having issues with getting the TestPolygon.java to run correctly. THe "//Constructor that creates four polygons with any value that are not equal to the defualt value or to each other Polygon[] P_array = {new Polygon(10,5.0,1.0,3.0), new Polygon(6,3,2,5), new Polygon(4,11,4,3), new Polygon(5,12,6,7)}; " line of my code keeps coming back with an error for every new statement saying that "no suitable constructor found for Polygon(int,double,double,double). Picture is attached.
/* File: Polygon.java
* Author: Darren Pirtle Jr.
* Date: November 16, 2016
* Purpose: Design a Java class
* named Polygon
*/
import java.lang.Math;
public class Polygon {
private int numSides;
private double sideLength;
private double xCoord;
private double yCoord;
private double apothem;
private double perimeter;
//Constructor that creates a Polygon using the defaults
public Polygon(){
numSides = 4;
sideLength = 10.0;
xCoord = 0.0;
yCoord = 0.0;
apothem = 5.0;
}
//Constructor that uses the specified numbers
public Polygon(int s,double sL,double x,double y,double a, double p){
setNumSides(s);
setSideLength(sL);
setXCoord(x);
setYCoord(y);
setApothem(a);
}
// A getArea() method that returns a double value for the area of the polygon
public double getArea() {
return .5*apothem*perimeter;
}
// Getter and setter for all data fields
public int setNumSides(int s){
numSides = s;
return numSides;
}
public double setSideLength(double sL){
sideLength = sL;
return sideLength;
}
public double setXCoord(double x){
xCoord = x;
return xCoord;
}
public double setYCoord(double y){
yCoord = y;
return yCoord;
}
public double setApothem(double a){
apothem = a;
return apothem;
}
public double setPerimeter(double p){
perimeter = p;
return perimeter;
}
public int getNumSides() {
return numSides;
}
public double getSideLength() {
return sideLength;
}
public double getXCoord() {
return xCoord;
}
public double getYCoord() {
return yCoord;
}
public double getApothem() {
return apothem;
}
public double getPerimeter() {
return perimeter;
}
//A toString() that displays the values in string format
public String toString(){
return "("+numSides+", "+String.format("%.1f",sideLength)+", "+String.format("%.1f",xCoord)+", "+String.format("%.1f",yCoord)+")";
}
}
/* File: Polygon.java
* Author: Darren Pirtle Jr.
* Date: November 16, 2016
* Purpose: Design a Java class
* named Polygon
*/
//Import necessary packages
import java.util.Scanner;
import java.text.DecimalFormat;
import java.lang.Math;
class TestPolygon{
public static void main(String[] args){
//Constructor that creates one polygon with no argument
Polygon P = new Polygon();
//Constructor that creates four polygons with any value that are not equal to the defualt value or to each other
Polygon[] P_array = {new Polygon(10,5.0,1.0,3.0), new Polygon(6,3,2,5), new Polygon(4,11,4,3), new Polygon(5,12,6,7)};
//Constructor that calls all methods and displays results
System.out.println("toString() results: "+P);
System.out.println("getNumSides() results: "+ P.getNumSides());
System.out.println("getSideLength() results: "+ P.getSideLength());
System.out.println("getXCoord() results: "+ P.getXCoord());
System.out.println("getYCoord() results: "+ P.getYCoord());
System.out.println("getPerimeter() results: "+ P.getPerimeter());
System.out.println("setNumSides(4) results: "+ P.setNumSides(4));
System.out.println("setSideLength(3.0) results: "+ P.setSideLength(3.0));
System.out.println("setXCoord(2.0) results: "+ P.setXCoord(2));
System.out.println("setYCoord(2.0) results: "+ P.setYCoord(2));
for(int i=0; i<P_array.length; i++)
{
System.out.println("toString() results: "+P_array[i]);
System.out.println("getNumSides() results: "+ P_array[i].getNumSides());
System.out.println("getSideLength() results: "+ P_array[i].getSideLength());
System.out.println("getXCoord() results: "+ P_array[i].getXCoord());
System.out.println("getYCoord() results: "+ P_array[i].getYCoord());
System.out.println("getPerimeter() results: "+ P_array[i].getPerimeter());
System.out.println("setNumSides(4) results: "+ P_array[i].setNumSides(4));
System.out.println("setSideLength(3.0) results: "+ P_array[i].setSideLength(3.0));
System.out.println("setXCoord(2.0) results: "+ P_array[i].setXCoord(2));
System.out.println("setYCoord(2.0) results: "+ P_array[i].setYCoord(2));
}
}
}
推荐答案
错误消息说明了一切:
这只是意味着Java无法找到带有参数(int, double, double, double)
(这是创建Polygon对象时使用的参数)的Polygon类的构造函数
It simply means that Java is unable to find a constructor for class Polygon with argument (int, double, double, double)
(which is what you have used when creating a Polygon object)
如果您查看类Polygon的构造函数:
If you look at your constructors for class Polygon:
您创建了2个构造函数:
You created 2 constructors:
-
无参数构造器
No arguments constructor
具有6个参数的构造函数(int,double,double,double,double,double,double)
Constructor with 6 arguments (int, double, double, double, double, double)
因此,在创建Polygon对象时,请确保您正在执行以下操作:
Hence, when creating a Polygon object, ensure you are doing:
new Polygon();
or
new Polygon(int, double, double, double, double, double);
示例:
Polygon p1 = new Polygon();
Polygon p2 = new Polygon(10, 2.5, 3.5, 4.5, 5.5, 6.5);
Polygon p3 = new Polygon(10, 20, 30, 40, 50, 60); //this is ok too
现在,您仅提供4个参数:
new Polygon(10, 5.0, 1.0, 3.0),
^ ^ ^ ^
| | | |
int d d d (d for double)
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