pyramid pattern program in java

import java.util.*;

public class HelloWorld {
public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
int n=sc.nextInt();
for(int i=0;i<n;i++)
{
for(int j=0;j<2n;j++)
{
if(j>=n-i && j<=n+i)
{
System.out.print("");
}
else if(n-i-1>j)
{
System.out.print(" ");
}
}
System.out.println();
}
}
}