diff --git a/OOP/Java/Lab/Week8/SquareTriangle/SqTriInt.java b/OOP/Java/Lab/Week8/SquareTriangle/SqTriInt.java
new file mode 100644
index 0000000..ee71f5c
--- /dev/null
+++ b/OOP/Java/Lab/Week8/SquareTriangle/SqTriInt.java
@@ -0,0 +1,42 @@
+interface Shape {
+    double calculateArea();
+}
+
+class Square implements Shape {
+
+    private double side;
+
+    public Square(double side) {
+        this.side = side;
+    }
+
+    public double calculateArea() {
+        return side * side;
+    }
+}
+
+class Triangle implements Shape {
+
+    private double base;
+    private double height;
+
+    public Triangle(double base, double height) {
+        this.base = base;
+        this.height = height;
+    }
+
+    public double calculateArea() {
+        return 0.5 * base * height;
+    }
+}
+
+public class Main {
+
+    public static void main(String[] args) {
+        Shape square = new Square(5.0);
+        Shape triangle = new Triangle(4.0, 6.0);
+
+        System.out.println("Area of Square: " + square.calculateArea());
+        System.out.println("Area of Triangle: " + triangle.calculateArea());
+    }
+}
diff --git a/OOP/Java/Lab/Week8/SquareTriangle/SquareTriangle.java b/OOP/Java/Lab/Week8/SquareTriangle/SquareTriangle.java
new file mode 100644
index 0000000..64ab467
--- /dev/null
+++ b/OOP/Java/Lab/Week8/SquareTriangle/SquareTriangle.java
@@ -0,0 +1,47 @@
+abstract class Shape {
+
+    abstract double calculateArea();
+}
+
+class Square extends Shape {
+
+    private double side;
+
+    public Square(double side) {
+        this.side = side;
+    }
+
+    double calculateArea() {
+        return side * side;
+    }
+}
+
+class Triangle extends Shape {
+
+    private double base;
+    private double height;
+
+    public Triangle(double base, double height) {
+        this.base = base;
+        this.height = height;
+    }
+
+    double calculateArea() {
+        return 0.5 * base * height;
+    }
+}
+
+public class SquareTriangle {
+
+    public static void main(String[] args) {
+        Square square = new Square(5);
+        Triangle triangle = new Triangle(4, 6);
+
+        System.out.println(
+            "Area of square: " + square.calculateArea() + " square units"
+        );
+        System.out.println(
+            "Area of triangle: " + triangle.calculateArea() + " square units"
+        );
+    }
+}