//外循环控制行数
for (int i = 1; i <=5; i++) {
//内循环输出空格
for (int j = 4; j<=5; j++) {
System.out.println(" ");
}
//内循环输出*
for (int x = 1; x <=i*2-1; x++) {
System.out.print("*");
}
}
//外循环控制行数
for (int i = 1; i <=5; i++) {
//内循环输出空格
for (int j = 4; j<=5; j++) {
System.out.println(" ");
}
//内循环输出*
for (int x = 1; x <=i*2-1; x++) {
System.out.print("*");
}
}