How to use Java Methods

How to use method overloading for printing different types of array

public class MainClass {

   public static void printArray(Integer[] inputArray) {

      for (Integer element : inputArray){

         System.out.printf("%s ", element);

         System.out.println();

      }

   }

   public static void printArray(Double[] inputArray) {

      for (Double element : inputArray){

         System.out.printf("%s ", element);

         System.out.println();

      }

   }

   public static void printArray(Character[] inputArray) {

      for (Character element : inputArray){

         System.out.printf("%s ", element);

         System.out.println();

      }

   }

   public static void main(String args[]) {

      Integer[] integerArray = { 1, 2, 3, 4, 5, 6 };

      Double[] doubleArray = { 1.1, 2.2, 3.3, 4.4,

      5.5, 6.6, 7.7 };

      Character[] characterArray = { 'H', 'E', 'L', 'L', 'O' };

      System.out.println("Array integerArray contains:");

      printArray(integerArray);

      System.out.println("\nArray doubleArray contains:");

      printArray(doubleArray);

      System.out.println("\nArray characterArray contains:");

      printArray(characterArray);

   }

}

How to use method overriding in Inheritance for subclasses

public class Findareas{

   public static void main (String []agrs){

      Figure f= new Figure(10 , 10);

      Rectangle r= new Rectangle(9 , 5);

      Figure figref;

      figref=f;

      System.out.println("Area is :"+figref.area());

      figref=r;

      System.out.println("Area is :"+figref.area());

   }

}

class Figure{

   double dim1;

   double dim2;

   Figure(double a , double b) {

      dim1=a;

      dim2=b;

   }

   Double area() {

      System.out.println("Inside area for figure.");

      return(dim1*dim2);

   }

}

class Rectangle extends Figure {

   Rectangle(double a, double b) {

      super(a ,b);

   }

   Double area() {

      System.out.println("Inside area for rectangle.");

      return(dim1*dim2);

   }

}