こういうことか
class Pyramid {
static void repeat(char c, int n) {
for (int i = 0; i < n; ++i)
System.out.print(c);
}
static void spira(int n) {
for ( int i = 1; i <= n; ++i ) {
repeat(' ', n-i);
repeat('*', (i-1)*2+1);
System.out.println("");
}
}
public static void main(String args[]) {
spira(5);
}
}