Java编程：输出三角形

package d;

import java.util.Scanner;

public class DD {

public static void main(String[] args) {

Scanner input=new Scanner(System.in);

System.out.println("请输入n");

int n=input.nextInt();

for(int a=1;a<=n;a++){

System.out.println("");

for(int b=1;b<=a;b++){

System.out.print("X");

}

}

}

}