how to find simple and compound interest in java code example

Example: Java program to calculate compound interest

// Java program to calculate compound interest
public class CompoundInterestDemo 
{
   public void calculateCompound(int p, int t, double r, int n) 
   {
      double number = p * Math.pow(1 + (r / n), n * t);
      double interest = number - p;
      System.out.println("Compound interest after " + t + " years: " + interest);
      System.out.println("Money after " + t + " years: " + number);
   }
   public static void main(String[] args) 
   {
      CompoundInterestDemo obj = new CompoundInterestDemo();
      obj.calculateCompound(200000, 6, .06, 12);
   }
}