50 Programas Java: 25 arbolitos

import java.util.*;
public class Arbolitos{
    public static void main(String[] args){
Scanner leer = new Scanner (System.in);
double i=1,j,k=1,l=1,z;
System.out.println("Ingresa un numero: ");
j =leer.nextDouble();
System.out.println("Ingresa ciclos: ");
z =leer.nextDouble();
l=j;
do{
do{
            do{
            System.out.print("*");
            k++;
    }while (k<=i);
    k=1;
    System.out.println();
    i++;
}while(i!=j);
k=j;
do{
    do{
        System.out.print("*");
        k--;
    }while (k>=1);
    j=j-1;
    k=j;
    System.out.println();
    i--;
}while(i>=1);
j=l;
z--;
}while(z!=0);
}
}