java打印一个菱形

class  Part1
{
public static void paint(int n){
for(int i=1 ; i<=n ; i++){
paintDiamond(n,i) ;
}
for (int m=n-1;m>=0 ;m-- )
{
paintDiamond(n,m) ;
}
}

public static void paintDiamond(int n,int i){
for (int k=1;k<=n-i ;k++ )
{
System.out.print(" ");
}
for (int j=1;j<i ;j++ )
{
System.out.print("*");
System.out.print(" ");
}
System.out.println(" ") ;
}
public static void main(String[] args)
{
paint(8);
}
}