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  1.  
  2. import static java.lang.Math.sqrt;
  3.  
  4.  
  5. public class ThreePoints {
  6.  
  7.         float x0;
  8.         float y0;
  9.         float x1;
  10.         float y1;
  11.         float x2;
  12.         float y2;
  13.  
  14.  
  15.         public ThreePoints(){
  16.             this.x0 = 0;
  17.             this.y0 = 0;
  18.             this.x1 = 0;
  19.             this.y1 = 0;
  20.             this.x2 = 0;
  21.             this.y2 = 0;
  22.  
  23.         }
  24.         public ThreePoints(float x0, float y0, float x1, float y1, float x2, float y2){
  25.             this.x0 = x0;
  26.             this.y0 = y0;
  27.             this.x1 = x1;
  28.             this.y1 = y1;
  29.             this.x2 = x2;
  30.             this.y2 = y2;
  31.         }
  32.         public double getLength(int side){
  33.  
  34.  
  35.          if(side == 0 && isTriangle()){
  36.              return Math.sqrt((x2-x1) * (x2-x1) + (y2-y1) * (y2-y1));
  37.          } else if (side == 1 && isTriangle()){
  38.              return Math.sqrt((x2-x0) * (x2-x0) + (y2-y0) * (y1-y0));
  39.          } else if (side == 2 && isTriangle()){
  40.              return Math.sqrt((x1-x0) * (x1-x0) + (y1-y0) * (y1-y0)); 
  41.          }else{ return 0;
  42.  
  43.          }
  44.          }
  45.         public double getAngle(int vertex){
  46.  
  47.                 if(vertex == 0 && isTriangle()) {
  48.       double angle = Math.acos((-Math.pow(this.getLength(0),2)
  49.                     +Math.pow(this.getLength(1),2)
  50.                     +Math.pow(this.getLength(2),2))
  51.                     /(2*this.getLength(1)*this.getLength(2)));
  52.                     return angle;
  53.                } else if(vertex == 1 && isTriangle()) {
  54.       double angle = Math.acos((Math.pow(this.getLength(0),2)- Math.pow(this.getLength(1),2)
  55.                     +Math.pow(this.getLength(2),2))/
  56.                     (2*this.getLength(0)*this.getLength(2)));
  57.                     return angle;
  58.                } else if(vertex == 2 && isTriangle()){
  59.       double angle = Math.acos((Math.pow(this.getLength(0),2)
  60.                      +Math.pow(this.getLength(1),2)- Math.pow(this.getLength(2),2)) /(2*this.getLength(0)*this.getLength(1)));
  61.                      return angle;
  62.                } else {
  63.                      return 0;
  64.                        }
  65.  
  66.  
  67.                }
  68.         public boolean isTriangle(){
  69.  
  70.      if (!(x0 * (y1-y2) + x1 * (y2-y0) + x2 * (y0-y1) == 0)){
  71.          return true;
  72.      } 
  73.          return false;
  74.         }
  75.         public boolean isEquilateral(){
  76.               if (getLength(0) != getLength(1))
  77.                   return false;
  78.               if (getLength(0) != getLength(2))
  79.                   return false;
  80.               if (getLength(1) != getLength(2))
  81.                   return false;
  82.               return true;
  83.         }
  84.         public boolean isIsosceles(){
  85.             if (getLength(0) == getLength(1))
  86.                 return true;
  87.             if (getLength(0) == getLength(2))
  88.                 return true;
  89.             if (getLength(1) == getLength(2))
  90.                 return true;
  91.             return false;
  92.  
  93.         }
  94.         public boolean isScalene(){
  95.             if (getLength(0) == getLength(1))
  96.                 return true;
  97.             if (getLength(0) == getLength(2))
  98.                 return true;
  99.             if (getLength(1) == getLength(2))
  100.                 return true;
  101.             return false;
  102.         }
  103.         public boolean isAcute(){
  104.             if (getAngle(0) < 90 && getAngle(1) < 90 && getAngle(2) < 90){
  105.                 return true;
  106.             }
  107.             return false;
  108.         }
  109.         public boolean isObtuse(){
  110.             if (getAngle(0) > 90 && getAngle(1) > 90 && getAngle(2) > 90){
  111.                 return true;
  112.             }      
  113.             return false;
  114.         }
  115.         public double getPerimeter(){
  116.             double perimeter;
  117.             perimeter = (getLength(0) + getLength(1) + getLength(2));
  118.             return perimeter;
  119.         }
  120.         public boolean isRight(){
  121.         if (getAngle(0) == 90 && getAngle(1) == 90 && getAngle(2) == 90){
  122.         return true;
  123.         }
  124.         return false;
  125.         }
  126.         public double getArea(){
  127.         double s = ((getLength(0) + getLength(1) + getLength(2))/2);    
  128.         double area = sqrt(s * (s-getLength(0))*(s-getLength(1))*(s-getLength(2)));
  129.  
  130.             return area;
  131.         }
  132.         private boolean approxEqual (double x, double y) {
  133.             return Math.abs(x - y) <= 1E-12;
  134.         }
  135.         }
  136.  
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
Main.java:5: error: class ThreePoints is public, should be declared in a file named ThreePoints.java
public class ThreePoints {
       ^
1 error
stdout
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Standard output is empty
https://ideone.com/UB7x87
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
public

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