回首忆惘然
int i,j,k;for(i=1;i<=5;i++){for(j=1;j<=5-i;j++)System.out.print(" ");for(k=1;k<=2*i-1;k++)System.out.print("*");System.out.println("");}for(i=1;i<=4;i++){for(j=1;j<=i;j++)System.out.print(" ");for(k=1;k<=9-2*i;k++)System.out.print("*");System.out.println("");}