Java輸出倒三角

package text;

public class Protice {
    public static void main(String[] args) {
        for(int i = 0;i < 5;i++ ){
            for(int a = 0;a <= i;a++){
                System.out.print("  ");
            }
            for(int b = 1;b <= 2*(4-i)+1;b++ ){
                System.out.print(" *");
            }
            System.out.println();
        }
    }
}