Help sort randomly generated integers

Question

I am having trouble with this peace of code; I wrote a little test and found the same problem in my larger program. My problem is I can't sort an array that I randomly put int values in but if I put them in manually the values will sort. And hits or help would be great.
public class test {
    public static void main (String [] args) {
        int[] array = new int[20];
// Generator random int into array
        for (int i=0; i<array.length; i++) {
            array[i] = (int)(Math.floor(Math.random() * (20.0 - 0.0)) + 0.0);
// Selection sort
        int si, temp;
        si = 0;
        for(int i=0; i<=array.length-2; i++) {
            for(int j=i+1; j <=array.length-1; j++) {
                if(array[j]<array)
si = j;
// Swap
temp = array[i];
array[i] = array[si];
array[si] = temp;
// Output
for(int t=0; t<array.length; t++) {
System.out.println(array[t]);

Answer 1

This code will sort, and i am not asking anyone to do it for me, just and hits on what the problem could be.
public class test {
    public static void main (String [] args) {
        int[] array    = {9,8,4};
// Generator random int into array
        for (int i=0; i<array.length; i++) {
            array[i] = (int)(Math.floor(Math.random() * (20.0 - 0.0)) + 0.0);
// Selection sort
        int si, temp; 
        si = 0;
        for (int i=0; i<=array.length-2; i++) {
            for (int j=i+1; j<=array.length-1; j++) {
                if(array[j] < array) {
si = j;
// Swap
temp = array[i];
array[i] = array[si];
array[si] = temp;
// Output
for(int t=0; t<array.length; t++) {
System.out.println(array[t]);