Write a class called Triangle that can be used to represent a triangle. Write a class called TriangleDemo that will interface with the Triangle class. Triangle A Triangle will have 3 sides. The class will be able to keep track of the number of Triangle objects created. It will also hold the total of the perimeters of all the Triangle objects created. It will allow a client to create a Triangle, passing in integer values for the three sides. If the values for the sides that are passed in do not represent a valid Triangle, then all sides will be set to a value of 1. The constructor should add 1 to the count of the number of Triangles created and also call a method to calculate the perimeter and then add the perimeter for that object to an accumulator. In addition to the constructor, the Triangle class must have the following methods that return a boolean value: isRight () isAcute()isObtuse() isScalene() - no two sides are the same lengthisIsosceles() - exactly two sides are the same lengthisEquilateral() - all three sides are the same lengthisValid() - the sum of any two sides of a triangle must be greater than the third in order to represent a valid triangle. Also, no side may be 0 or negative. equals (Triangle t) – compares two Triangle objects to determine if they are equal. We will compare their perimeters to determine equality. Additional methods toString() – returns a String that specifies the values for the 3 sides of the trianglecalcPerim() – calculate and return the perimeter of the object.addTotalPerim(). This method will call calc_perim() and add the perimeter for that object to an accumulator. reduceTotalPerim(). This method should subtract the perimeter for that object from the accumulator.Accessor and mutator methods for all propertiesThe Triange object cannot assume that the values of the 3 sides are entered in any particular order. Be sure to specify proper visibility for all methods and properties Note 1 When given 3 triangle sides, to determine if the triangle is right, acute or obtuse: 1) Square all 3 sides.2) Sum the squares of the 2 shortest sides.3) Compare this sum to the square of the 3rd side.if sum = 3rd side² Right Triangleif sum > 3rd side² Acute Triangleif sum < 3rd side² Obtuse Triangle TriangleDemo Inside a loop in mainAllow the user to type 3 positive integers on separate lines for each triangle. Instantiate 9 Triangles (refer to the sample dialog below for test data)Store each Triangle object in an array of Triangle objects.Inside a separate loopUse if statements to test each triangle for its properties and print appropriate output.Print the values of the sides of each triangle.Print the properties that apply for each triangle. See the sample output.Print the Perimeter for each triangle.Test your equals method.At the end print the total of the perimeters for all triangles.Output must be labeled, aligned, and reasonably well-spaced

import java.util.*; public class TriangleDemo{ public static void main ( String[] args ) { Triangle[] triangles=new Triangle[9]; //array of triangles Scanner sc=new Scanner(System.in); for(int i=0;i<9;i++){ System.out.println("Enter sides of triangle"); int side1=sc.nextInt(); int side2=sc.nextInt(); int side3=sc.nextInt(); triangles[i]=new Triangle(side1,side2,side3); //create a Triangle and add it to array System.out.println(triangles[i]); //print Triangle info } System.out.println(triangles[0].equals(triangles[1])); //check whether both triangles are same } }public class Triangle{ //static variables of class public static float TRIANGLES_COUNT=0; public static float TOTAL_PERIMETER=0; //declaring instance variables private int side1; private int side2; private int side3; public Triangle(int side1,int side2, int side3){ TRIANGLES_COUNT=TRIANGLES_COUNT+1; this.side1=side1; this.side2=side2; this.side3=side3; if(!isValid()){ //if given sides are not valid initialize them to 1 this.side1=1; this.side2=1; this.side3=1; } addTotalPerim(); //add perimeter } public boolean isRight(){ int s1,s2,s3; //store largest in s3 if(side1>=side2 && side1>=side3){ s1=side2; s2=side3; s3=side1; } else if(side2>=side1 && side2>=side3){ s3=side2; s2=side3; s1=side1; } else{ s1=side1; s2=side3; s3=side3; } if( s3*s3 == s1*s1 + s2*s2) return true; return false; } public boolean isAcute(){ int s1,s2,s3; //store largest side in s3 if(side1>=side2 && side1>=side3){ s1=side2; s2=side3; s3=side1; } else if(side2>=side1 && side2>=side3){ s3=side2; s2=side3; s1=side1; } else{ s1=side1; s2=side3; s3=side3; } if(s3*s3 < s1*s1 +s2*s2) return true; return false; } public boolean isObtuse(){ int s1,s2,s3; //store largest side in s3 if(side1>=side2 && side1>=side3){ s1=side2; s2=side3; s3=side1; } else if(side2>=side1 && side2>=side3){ s3=side2; s2=side3; s1=side1; } else{ s1=side1; s2=side3; s3=side3; } if(s3*s3 > s1*s1 + s2*s2 ) return true; return false; } //if all sides are different public boolean isScalene(){ if(side1!=side2 && side2!=side3 && side3!=side2) return true; return false; } //if neither scalene nor equilateral public boolean isIsosceles(){ if(!isScalene() && !isEquilateral()) return true; return false; } //if all sides are equal public boolean isEquilateral(){ if(side1==side2 && side2==side3 && side3==side1) return true; return false; } //all sides poistive and sum of any two sides must be greater than third side public boolean isValid(){ if(side1>0 && side2>0 && side3>0 && side1+side2>side3 && side2+side3>side1 && side1+side3>side2) return true; return false; } //if all sides are same public boolean equals(Triangle t){ if(t.side1==side1 && t.side2==side2 && t.side3==side3) return true; return false; } //return all sides public String toString(){ return "Side 1: "+this.side1+"\tSide2: "+this.side2+"\tSide3: "+side3+"\n"; } //calculate perimeter public float calcPerim(){ return (side1+side2+side3)/2; } //add perimeter to Total public void addTotalPerim(){ TOTAL_PERIMETER=TOTAL_PERIMETER+calcPerim(); } //reduce perimeter from Total public void reduceTotalPerim(){ TOTAL_PERIMETER=TOTAL_PERIMETER-calcPerim(); } //getters and setters public int getSide1(){ return side1; } public void setSide1(int side1){ this.side1=side1; } public int getSide2(){ return side2; } public void setSide2(int side2){ this.side2=side2; } public int getSide3(){ return side3; } public void setSide3(int side3){ this.side3=side3; }}

Answered: Write a class called Triangle that can…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Write a class called Triangle that can be used to represent a triangle.

Write a class called TriangleDemo that will interface with the Triangle class.

Triangle

A Triangle will have 3 sides. The class will be able to keep track of the number of Triangle objects created. It will also hold the total of the perimeters of all the Triangle objects created.
It will allow a client to create a Triangle, passing in integer values for the three sides. If the values for the sides that are passed in do not represent a valid Triangle, then all sides will be set to a value of 1. The constructor should add 1 to the count of the number of Triangles created and also call a method to calculate the perimeter and then add the perimeter for that object to an accumulator.

In addition to the constructor, the Triangle class must have the following methods that return a boolean value:

isRight ()
isAcute()
isObtuse()
isScalene() - no two sides are the same length
isIsosceles() - exactly two sides are the same length
isEquilateral() - all three sides are the same length
isValid() - the sum of any two sides of a triangle must be greater than the third in order to represent a valid triangle. Also, no side may be 0 or negative.
equals (Triangle t) – compares two Triangle objects to determine if they are equal. We will compare their perimeters to determine equality.

Additional methods

toString() – returns a String that specifies the values for the 3 sides of the triangle
calcPerim() – calculate and return the perimeter of the object.
addTotalPerim(). This method will call calc_perim() and add the perimeter for that object to an accumulator.
reduceTotalPerim(). This method should subtract the perimeter for that object from the accumulator.
Accessor and mutator methods for all properties
The Triange object cannot assume that the values of the 3 sides are entered in any particular order.

Be sure to specify proper visibility for all methods and properties

Note 1

When given 3 triangle sides, to determine if the triangle is right, acute or obtuse:

1) Square all 3 sides.

2) Sum the squares of the 2 shortest sides.

3) Compare this sum to the square of the 3rd side.

if sum = 3rd side² Right Triangle

if sum > 3rd side² Acute Triangle

if sum < 3rd side² Obtuse Triangle

TriangleDemo

Inside a loop in main
- Allow the user to type 3 positive integers on separate lines for each triangle.
- Instantiate 9 Triangles (refer to the sample dialog below for test data)
- Store each Triangle object in an array of Triangle objects.
- Inside a separate loop
Use if statements to test each triangle for its properties and print appropriate output.
- Print the values of the sides of each triangle.
- Print the properties that apply for each triangle. See the sample output.
- Print the Perimeter for each triangle.
Test your equals method.
At the end print the total of the perimeters for all triangles.
Output must be labeled, aligned, and reasonably well-spaced

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