public class Testć public static void main（String[1 args）{// 首先把菱形看成上下","上五下四","所以第一个 for有5次","第二个for有4次 for（int i＝ 1; i<= 5; i++）{ // 将空格和*分开看","看" "的变化i=1时","他是4 ","2的时 候是3找规律 for（intj＝1;j<= 5－i;j++) System.out.print(""); for（int k＝1; k <= 2 *i- 1; k++）// 找规律”,"i是 135 7基数嘛 System.out.print('*')；// 换一行 System.out.println(); }for（int i＝1; i<= 4; i++){ for（intj＝1;j<= i; j++）/. 空格1234 so System.out.print("");for（intk＝7;k >=2*i－1;k--）//*7531倒着来的基数 System.out.print('*');System.out.println();}}}"}]