Making Patterns (Diamond Shape) Using Nested Loops

I have to make a pattern that is of a diamond shape such as this:

Java Code:
1
1 2 3
1 2 3 4 5
1 2 3
1
mh_sh_highlight_all('java');

I wrote this (for the variable name, this is just a small part of my program and I'm trying to get the pattern right so I didn't mind my variables at the moment):

Java Code:

public class NewFile{
public static void main(String []args){
int k = 0;
for (int i=1 ; i<=5 ; i++) {
{ for (int h=2 ; h >= i ; h--)

[Code] ....

My output is the following:

Java Code:
1
123
12345
1234567
123456789
mh_sh_highlight_all('java');

I realize I should divide the code into a lower and upper triangle using two loops. However, I don't know how to break the first part. I did find the "trend" but I don't see how to implement it.