Fibonacci Program:

public class FibonacciSeries {
int counter=0;
public void generateSeries(int num) {
int f1=0, f2 = 0, f3 = 1;
do {
counter++;
f1 = f2;
f2 = f3;
f3 = f1 + f2;
System.out.println(f3);
} while (counter <= num);
}
public static void main(String[] args) {
System.out.println("*****Fibonnaci Series*****");
FibonacciSeries fb = new FibonacciSeries();
fb.generateSeries(10);
}
}

Ascending And Descending Order of Numbers:

import java.util.*;
class AscendingAndDescendingOrder{
    public static void main(String[] args) 
    {
        Scanner input=new Scanner(System.in);
        System.out.print("Enter 5 Numbers: ");
        int num[]=new int[5];
        for(int i=0;i<num.length;i++){
            num[i]=input.nextInt();
        }
        System.out.println("Numbers in Ascending Order: ");
        Arrays.sort(num);
        for(int i=0;i<num.length;i++){
            System.out.println(num[i]);
        }
        System.out.println("Numbers in Descending Order: ");
        Arrays.sort(num,Collections.reverseOrder());
        for(int i=0;i<num.length;i++){
            System.out.println(num[i]);
        }


    }
}

Programs for Java beginners