描述：Java编程实现如下金字塔效果。
代码：
1 package tes; 2
3 public class cj { 4 public static void main(String[] args) { 5 for (int i = 1; i <=5; i++) { 6 for (int j = 5; j >i; j--) { 7 System.out.print(" "); 8 } 9 for (int j = i; j >=1; j--) { 10 System.out.print(j); 11 } 12 for (int j = 2; j <=i; j++) { 13 System.out.print(j); 14 } 15 System.out.println(); 16 } 17 } 18 }