Answer:
See explaination
Explanation:
The 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 ";
}
}
The Triangle program
public class Triangle extends GeometricObject {
private double side1 = 1.0;
private double side2 = 1.0;
private double side3 = 1.0;
public Triangle() {
}
public Triangle(double side1, double side2, double side3) {
this.side1 = side1;
this.side2 = side2;
this.side3 = side3;
}
public double setSide1() {
return side1;
}
public double setSide2() {
return side2;
}
public double setSide3() {
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() {
return (side1 + side2 + side3) / 2;
}
public double getPerimeter() {
return side1 + side2 + side3;
}
public String toString() {
return " Triangle: Side 1 = " + side1 + " Side 2 = " + side2
+ " Side 3 = " + side3;
}
}
The Testprogram.
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? Reply with 'True' or 'False' ");
String filled = input.next();
}
{
new Triangle(side1, side2, side3);
//How do i get the information into theTriangle?
System.out.println("The Triangle Sides are \n side 1: " + side1 + "\n Side 2: " + side2 + "\n Side 3: " + side3);
System.out.println("The Triangle's Area is " + (side1 + side2 + side3) / 2);
System.out.println("The Triangle's Perimeter is "
+ (side1 + side2 + side3));
System.out.println("The Triangle's Color is " + //what goes here?);
System.out.println("Is the Triangle filled? " + //what goes here?);
}
}
You need to create a new Triangle object like this, so that you have a reference
Trangle triangle = new Triangle(side1, side2, side3);
// ^^^^^^ This is the most important thing you're missing. You need a reference
// point for your object. That's the only way you can access it's
// properties.
You also need to set it's filled and color properties
triangle.setFilled(filled);
triangle.setColor(color);
Then, you can invoke its methods like this:
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());
You're able to access the GeometricObject's isFilled(), setFilled(), getColor(), and setColor() because a Triangle is a GeometricObject (extends), so it inherits all its methods.
By the way, this is not how to calculate the area of a triangle:
public double getArea() {
return (side1 + side2 + side3) / 2; // This is so wrong
}
Check out this link for correct formula
Edit: With another problem with code
public double setSide1() {
return side1;
}
public double setSide2() {
return side2;
}
public double setSide3() {
return side3;
}
/**** Should Be ******/
public double getSide1() {
return side1;
}
public double getSide2() {
return side2;
}
public double getSide3() {
return side3;
}
Edit: Triangle Formula
public double getArea() {
int p = getPerimeter() / 2
return Math.sqrt(p * ((p - side1) * (p - side2) * (p - side3));
}
