打印等腰三角形

public class Demo {
    public static void main(String[] args) {
        for (int i = 1; i <= 5; i++) {
            for(int j = 5;j >= i;j--){
                System.out.print(" ");
            }
            for(int j = 1;j <= i;j++){
                System.out.print("*");
            }
            for(int j = 1;j < i;j++){
                System.out.print("*");
            }
            System.out.println();
        }
    }
}
https://www.bilibili.com/video/BV12J41137hu?p=44