Question

设计一个名为Triangle的类，它扩展了GeometricObject 它必须包含：

三个双重数据字段，名为side1，side2和side3，默认值为1.0，表示三角形的三个边

使用指定的side1，side2和side3创建三角形的无参数构造函数。

所有三个数据字段的访问器方法。

一个名为getArea（）的方法，返回该三角形的区域。

一个名为getPerimeter（）的方法，它返回此三角形的周长。

*一个名为toString（）的方法，它返回三角形的字符串描述。

有关计算三角形面积的公式，请参阅ProgrammingExercise 2.15（在java编程第9版简介中）toString（）方法实现如下：

返回＆＃34;三角形：side1 =＆＃34; + side1 +＆＃34; side2 =＆＃34; + side2 +＆＃34; side3＆＃34; + side3;

编写一个测试程序，提示用户输入三角形的三个边，颜色和布尔值，以指示三角形是否已填充。程序应该使用这些边创建一个三角形对象，并使用输入设置颜色和填充属性。程序应显示区域，周长，颜色以及真或假，以指示是否填充。

我的问题是它没有输出区域，周长，颜色以及真或假来指示它是否已填满。它会在＃34;三角形填满之后停止吗？＆＃39;真正的＆＃39;或者＆＃39;错误＆＃39;＆＃34;。有人帮帮我吗？

三角

    public class Triangle extends GeometricObject {

private double side1 = 1.0;
private double side2 = 1.0;
private double side3 = 1.0;

Triangle triangle = new Triangle(side1, side2, side3);    

public Triangle() {
}

public Triangle(double side1, double side2, double side3) {
    this.side1 = side1;
    this.side2 = side2;
    this.side3 = side3;

}

public double getSide1() {
    return side1;
}

public double getSide2() {
    return side2;
}

public double getSide3() {
    return side3;
}

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

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

public void setSide3(double side3) {
    this.side3 = side2;
}

public double getArea() {
    int p = (int) getPerimeter() / 2;
    return Math.sqrt(p * ((p - side1) * (p - side2) * (p - side3)));
}

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

public String toString() {
return " Triangle: Side 1 = " + side1 + " Side 2 = " + side2
       + " Side 3 = " + side3;
    }
    }

GeometricObject

    public class GeometricObject {
private String color = " white ";
private boolean filled;
private java.util.Date dateCreated;


public GeometricObject() {
    dateCreated = new java.util.Date();
}

public GeometricObject(String color, boolean filled) {
    dateCreated = new java.util.Date();


    this.color = color;
    this.filled = filled; 

}

public String getColor() {
    return color;
}

public void setColor(String color) {
    this.color = color;
}

public boolean isFilled() {
    return filled;
}

public void setFilled(boolean filled) {
    this.filled = filled;
}

public java.util.Date getDateCreated() {
    return dateCreated;
}

public String toString() {
    return "Created on " + dateCreated + "\n color: " + color + " and filled    ";                 
}   
     }

TestTriangle

    import java.util.Scanner;

    public class TestTriangle  {

private double Side1 = 1.0;
private double Side2 = 1.0;
private double Side3 = 1.0;

public static void main(String[] args) {
    Scanner input = new Scanner(System.in);

    System.out.println("Enter three sides of the Triangle");
    double Side1 = input.nextDouble();
    double Side2 = input.nextDouble();
    double Side3 = input.nextDouble();



    System.out.println("Enter the color of the Triangle");
    String color = input.next();


    System.out.println("Is the Triangle filled? 'True' or 'False' ");

    String filled = input.next(); 
}
{
    Triangle triangle = new Triangle(Side1, Side2, Side3);


    System.out.println("The Triangle Sides are \n side 1: " + triangle.getSide1() + "\n Side 2: " + triangle.getSide2() + "\n Side 3: " + triangle.getSide3());

        System.out.println("The Triangle's Area is " + triangle.getArea());

        System.out.println("The Triangle's Perimeter is " + triangle.getPerimeter());

        System.out.println("The Triangle's Color is " + triangle.getColor());
        System.out.println("Is the Triangle filled? " + triangle.isFilled());


        }
    }

三角计划不会输出结果

0 个答案: