Added examples for java basics module

Java/java-basics-ii/JavaMethodOverloading.java

@@ -0,0 +1,25 @@
+import java.util.*;
+
+public class JavaThisKeyword {
+    public int add(int a, int b) {
+        return a + b;
+    }
+
+    public double add(double a, double b) {
+        return a + b;
+    }
+
+    public int add(int a, int b, int c) {
+        return super.add(a, b) + c;
+    }
+
+    public static void main(String[] args) {
+        Calculator calc = new Calculator();
+
+        int result1 = calc.add(2, 3);
+        double result2 = calc.add(2.5, 3.5);
+
+        System.out.println(result1);
+        System.out.println(result2);
+    }
+}