Java Program To Print Stars In Eclipse Shape

public class Circle {
public static void main(String arg[]) {
StringBuffer str = new StringBuffer();
str = new StringBuffer();
int r = 16;
for (int i = -r; i <= r; i++) {
for (int j = -r; j <= r; j++) {
if (i * i + j * j <= r * r) {
str.append(" * ");
} else {
str.append("   ");
}
}
str.append("\n");
}
System.out.println(str);
}
}