我找不到显示triangle.setColor('yelow')和Triangle.setFillet(true)的方法

Question

我对Triangle类有两个问题。当我测试程序时，我能够显示所有的结果，但我仍然可以获得颜色和填充true/false。我将输出放在末尾，这样您就可以看到发生了什么。

我试着解决这个问题，添加了即时变量b o lean填充；然后在构造函数中尝试添加边、字符串颜色和b o lean填充，然后尝试在主系统中添加print ln (三角形get find ())，但我仍然无法找到答案。我也尝试了重写get Color和Get find，但我仍然可以找到正确的解决方案。

编写一个测试程序，创建一个三角形对象，并显示(1)面积，(2)周长，(3)颜色和(5)是否填充。

// Coding:
public class Exercise11_01 {
    public static void main(String[] args) {
        Triangle triangle = new Triangle(1, 1.5, 1);
        triangle.setColor("yellow"); // No display in the output
        triangle.setFilled(true); // No Display in the output
             
        System.out.println(triangle);
        System.out.println("The area is " + triangle.getArea());
        System.out.println("The perimeter is "  + triangle.getPerimeter());
        System.out.println(triangle);
    }    
}

// superclass: GeometricObject
package geometricobject;
import java.util.Date;

public class GeometricObject {
    String color = "white";
    boolean filled;
    private java.util.Date dateCreated;
    
    
    /** Construct a default geometric object */
    public GeometricObject(){
        dateCreated = new java.util.Date();
    }

    /** Construct a geometric object with the specific color and filled value */
    public GeometricObject(String color, boolean filled){
        
        dateCreated= new java.util.Date();
        this.color = color;
        this.filled = filled;
    }
    
    /** Return color */
    public String getColor(){
        return color;
    }
    
    /** Set a new color */
    public void setColor(String color){
        this.color = color;
    }
    
    /** Return filled. Since filled is boolean
     its getter method is named isFilled */
    public boolean isFilled(){
        return filled;
    }
    
    /** Set a new filled */
    public void setFilled(boolean filled){
        this.filled = filled;
    }
    
    /** Get dateCreated */
    public java.util.Date getDateCreated(){
        return dateCreated;
    }
    
    /** Return a string representation of this object */
    public String toString(){
        return "created on " + dateCreated + "\ncolor: " + color + " and filled: " + filled;
    }
}

//subclass-extends: Triangle
package geometricobject;

/**
 *
 * @author
 */
public class Triangle extends GeometricObject {
    // Instant Variables
    private double side1;
    private double side2;
    private double side3;
    //boolean filled;
    
    public Triangle() {
        //super();
        this.side1 = 1.0;
        this.side2 = 1.0;
        this.side3 = 1.0;
    }
    public Triangle(double side1, double side2, double side3) { // , String color, boolean filled)
        //super(color, filled);
        
        this.side1 = side1;
        this.side2 = side2;
        this.side3 = side3;
        
        setColor(color);
        setFilled(filled);
    }

    public double getSide1() {
        return side1;
    }

    public void setSide1(double side1) {
        this.side1 = side1;
    }

    public double getSide2() {
        return side2;
    }

    public void setSide2(double side2) {
        this.side2 = side2;
    }

    public double getSide3() {
        return side3;
    }

    public void setSide3(double side3) {
        this.side3 = side3;
    }
    
    public double getArea(){
        double s = (side1 + side2 + side3) / 2.0;
        return Math.pow(s * (s - side1) * (s - side2) * (s - side3), 0.5);
    }

    public double getPerimeter(){
        return side1 + side2 + side3;
    }

    @Override
    public String toString(){
        return "\nTriangle: side1 = " + side1 + " ,  side2 = " + side2 + 
                " , side3 = " + side3;
    }
}

//我的输出:三角形: side1 = 1.0，side2 = 1.5，side3 = 1.0面积为0.49607837082461076周长为3.5

三角形: side1 = 1.0，side2 = 1.5，side3 = 1.0构建成功(总时间:0秒)

Answer 1

根据我的评论，您可以使用从GeometricObject类继承的任何方法。要获得填充和颜色，您可以简单地使用：

System.out.println("The triangle is filled: "  + triangle.isFilled());
System.out.println("The color is " + triangle.getColor());

如下所示：

Triangle triangle = new Triangle(1, 1.5, 1);
triangle.setColor("yellow");
triangle.setFilled(true);

System.out.println(triangle);
System.out.println("The area is " + triangle.getArea());
System.out.println("The perimeter is "  + triangle.getPerimeter());
System.out.println("The triangle is filled: "  + triangle.isFilled());
System.out.println("The color is " + triangle.getColor());

输出显示了有关填充和颜色的额外信息：

Triangle: side1 = 1.0 ,  side2 = 1.5 , side3 = 1.0
The area is 0.49607837082461076
The perimeter is 3.5
The triangle is filled: true
The color is yellow

Answer 2

在我的三角形程序中解决问题。在我的源包中，我有几个与GeometricObject相关的程序和几个测试程序，当我试图运行它时，它们会禁用一些三角形程序的功能。在我清理/删除这些测试程序后，再次运行您的答案。这个程序显示了我需要的所有信息。我刚刚了解到，我需要创建一个新的源包，以避免错误，这些错误会花费我大量的时间来找出问题。下面的三角形程序有其他额外的实现，并删除了一些在这种情况下不必要的方法。

package geometricobject;
import java.util.Date;

public class GeometricObject {
    String color = "white";
    boolean filled;
    private java.util.Date dateCreated;
    
    
    /** Construct a default geometric object */
    public GeometricObject(){
        dateCreated = new java.util.Date();
    }

    /** Construct a geometric object with the specific color and filled value */
    public GeometricObject(String color, boolean filled){
        
        dateCreated= new java.util.Date();
        this.color = color;
        this.filled = filled;
    }
    
    /** Return color */
    public String getColor(){
        return color;
    }
    
    /** Set a new color */
    public void setColor(String color){
        this.color = color;
    }
    
    /** Return filled. Since filled is boolean
     its getter method is named isFilled */
    public boolean isFilled(){
        return filled;
    }
    
    /** Set a new filled */
    public void setFilled(boolean filled){
        this.filled = filled;
    }
    
    /** Get dateCreated */
    public java.util.Date getDateCreated(){
        return dateCreated;
    }
    
    /** Return a string representation of this object */
    public String toString(){
        return "created on " + dateCreated + "\ncolor: " + color + " and filled: " + 
               filled;
    }
}


package geometricobject;

// Create a Triangle class.
public class Triangle extends GeometricObject {
    // Instant Variables
    // data fields: Three double sides 1, 2, and 3.
    private double side1;
    private double side2;
    private double side3;
        
    // Construct a default Triangle object - No arg.
    public Triangle() {
        this.side1 = 1.0;
        this.side2 = 1.0;
        this.side3 = 1.0;
    }
    
    // Construct a Triangle Object with the specified side1, side2, and side3.
    public Triangle(double side1, double side2, double side3) { 
        this.side1 = side1;
        this.side2 = side2;
        this.side3 = side3;
        
        setColor(color);
        setFilled(filled);
    }
    
    // Define Accessors 
    // Return side1
    public double getSide1() {
        return side1;
    }
    // Return side2
    public double getSide2() {
        return side2;
    }
    // Return side3
    public double getSide3() {
        return side3;
    }
    
    // Calculate the triangle's area.
    // Return area.
    public double getArea(){
        double s = (side1 + side2 + side3) / 2.0;
        return Math.pow(s * (s - side1) * (s - side2) * (s - side3), 0.5);
    }
    
    // Return the Triangle's perimeter.
    public double getPerimeter(){
        return side1 + side2 + side3;
    }

    // Return the string (toString Method) representing the triangle's sides. 
    @Override
    public String toString(){
        return "\nTriangle: side1 = " + side1 + " ,  side2 = " + side2 + 
                " , side3 = " + side3;
    }
}

package geometricobject;

public class Exercise11_01 {
    public static void main(String[] args) {
        Triangle triangle = new Triangle(1, 1.5, 1);
        triangle.setColor("yellow");
        triangle.setFilled(true);

        System.out.println(triangle);
        System.out.println("The area is " + triangle.getArea());
        System.out.println("The perimeter is "  + triangle.getPerimeter());
        System.out.println("The triangle is filled: "  + triangle.isFilled());
        System.out.println("The color is " + triangle.getColor());
    }    
}

输出：

Triangle: side1 = 1.0 ,  side2 = 1.5 , side3 = 1.0
The area is 0.49607837082461076
The perimeter is 3.5
The triangle is filled: true
The color is yellow
BUILD SUCCESSFUL (total time: 0 seconds)