通过画图来了解
public static void main(String[] args) {
/*
6 打印出如下图案(菱形)
*
***
*****
*******
*****
***
*
*/
//打印上半部分
for (int line = 0; line <4 ; line++) {
//当前行先打印空格
for (int i = 0; i <3-line ; i++) {
System.out.print(" ");
}
//在空格后再打印*
for (int i = 0; i <2*line+1 ; i++) {
System.out.print("*");
}
System.out.println();
}
//打印下三角
for (int line = 0; line <3 ; line++) {
//先打印空格
for (int i = 0; i <line+1; i++) {
System.out.print(" ");
}
//打印*
for (int i = 0; i <5-2*line ; i++) {
System.out.print("*");
}
System.out.println();
}
}