// Introduced in Chapter 9/** Fibonacci numbers. */public class Fibo {  /** Return the nth Fibonacci number. */  public static int fibo(int n) {    int[] f = new int[n + 1];    f[0] = 1;    f[1] = 1;    for (int i = 2; i <= n; i++) {      f[i] = f[i - 1] + f[i - 2];    }    return f[n];  }  public static void main(String[] args) {    System.out.println(fibo(4));  }}