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

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我对三角形 class 有两个问题。 当我测试程序时，我能够显示所有结果，但我仍然可以获得颜色和填充真/假。 我把 output 放在最后，这样你就可以看到发生了什么。

我试图通过添加即时变量 boo lean Filled 来解决它； 然后在构造函数中尝试在边后添加，String color 和 bo lean 填充，然后尝试在主系统中添加 print ln (triangle get Filled()，但我仍然无法找到答案。还尝试了覆盖获取颜色并填充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 object：边 1 1.5 1； 黄色; 填充为真并显示（1）面积，（2）周长，（3）颜色以及（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output：三角形：side1 = 1.0, side2 = 1.5, side3 = 1.0 面积是0.49607837082461076 周长是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 GeometricObject class 中的任何继承方法。 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());

像这样：

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());

output 显示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，当我尝试运行它时会禁用一些 Triangle 程序功能。 在我清理/删除这些测试程序并用你的答案再次运行之后。 该程序显示我需要的所有信息。 我刚刚了解到我需要创建一个新的源 package 以避免后来花费我很多时间来找出问题的错误。 在带有其他附加实现的三角形程序下方，并删除了在这种情况下不需要的一些方法。

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());
    }    
}

OUTPUT：

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)