Change various shape classes to inherit from parent classes.

Implement test code to test different shapes.

Author: lima-1thing

src/com/codenext/day8/EquilateralTriangle.java

@@ -1,22 +1,9 @@
 package com.codenext.day8;
 
-public class EquilateralTriangle {
+public class EquilateralTriangle extends IsoscelesTriangle{
 
-  private double a, b, c;
-
-  public IsoscelesTriangle(double equalSide, double c) {
-    this.a = equalSide;
-    this.b = equalSide;
-    this.c = c;
-  }
-
-  public double area() {
-    double p = perimeter() / 2;
-    return Math.sqrt(p * (p - a) * (p - b) * (p - c));
+  public EquilateralTriangle(double side) {
+    super(side, side);
+    setShapeType("EquilateralTriangle");
   }
-
-  public double perimeter() {
-    return a + b + c;
-  }
-
 }

src/com/codenext/day8/IsoscelesTriangle.java

@@ -1,31 +1,8 @@
 package com.codenext.day8;
 
-public class IsoscelesTriangle {
-
-  private double a, b, c;
-
+public class IsoscelesTriangle extends Triangle{
   public IsoscelesTriangle(double equalSide, double c) {
-    setSides(equalSide, c);
-  }
-
-  public void setSides(double equalSide, double c) {
-    this.a = equalSide;
-    this.b = equalSide;
-    this.c = c;
-  }
-
-  public void setSideAndAngle(double equalSide, double angle) {
-    this.a = equalSide;
-    this.b = equalSide;
-    this.c = Math.sin(Math.toRadians(angle)) * equalSide;
-  }
-
-  public double area() {
-    double p = perimeter() / 2;
-    return Math.sqrt(p * (p - a) * (p - b) * (p - c));
-  }
-
-  public double perimeter() {
-    return a + b + c;
+    super(equalSide, equalSide, c);
+    setShapeType("IsoscelesTriangle");
   }
 }

src/com/codenext/day8/Shape.java

@@ -1,20 +1,16 @@
 package com.codenext.day8;
 
-public class Shape {
+public abstract class Shape {
 
   private String shapeType;
 
   public Shape(String shapeType) {
     this.shapeType = shapeType;
   }
 
-  public double area() {
-    return 0;
-  }
+  public abstract double area();
 
-  public double perimeter() {
-    return 0;
-  }
+  public abstract double perimeter();
 
   @Override
   public String toString() {

src/com/codenext/day8/ShapeTest.java

@@ -0,0 +1,16 @@
+package com.codenext.day8;
+
+import java.util.ArrayList;
+
+public class ShapeTest {
+
+  public static void main(String[] args) {
+    ArrayList<Shape> shapes = new ArrayList<>();
+    shapes.add(new Triangle(100,200, 150));
+    shapes.add(new IsoscelesTriangle(100,150));
+    shapes.add(new EquilateralTriangle(100));
+    shapes.add(new Rectangle(100,200));
+
+    System.out.println(shapes);
+  }
+}