Java黑皮书编程练习题6.08（显示图案）

题目： 

编写方法显示如下图案：

public static void displayPattern(int n)

import java.util.Scanner;

public class Exercise06_06 {
    public static void displayPattern(int n ){
        String last =" ";

       for (int i =1;i<=n;i++){
           for (int x =i;x<n;x++){
               last += "  ";
           }
           for (int y =i;y>=1;y--){
               last += " "+y;
           }
           System.out.println(last);
           last=" ";
       }

    }

    public static void main(String[] args) {
        Scanner input=new Scanner(System.in);
        int n=input.nextInt();
        displayPattern(n);
    }
}