打印菱形

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class PrintStars {

public static void main(String[] args) throws NumberFormatException, IOException
{
BufferedReader br= new BufferedReader(new InputStreamReader(System.in));
int allNums = Integer.parseInt(br.readLine());

for(int i = 1; i < (allNums + 1); i++)
{
printLine(allNums,i);
}
for(int j = (allNums - 1); j > 0; j--)
{
printLine(allNums,j);
}
}

public static void printLine(int allNums, int n)
{
for(int i = 0; i < (allNums - n); i++)
{
System.out.print(" ");
}
int temp = n;
while(temp > 0)
{
System.out.print("* ");
temp--;
}
System.out.println();
}
}