public class t8 {
public static void main(String[] args) {
//上半部分
for (int m = 1; m <= 10; m++)
{
//输出空格
for (int n = 9; n >= m ;n--)
{
System.out.print(" ");
}
//输出* 左上
for (int n = 1; n <= m; n++)
{
System.out.print("*");
}
//右上
for (int n = 1; n < m; n++)
{
System.out.print("*");
}
System.out.println();
}
//下半部分
for (int m = 1; m <= 9; m++)
{
//输出空格
for (int n = 1; n <= m ;n++)
{
System.out.print(" ");
}
//输出* 左下
for (int n = 9; n >= m; n--)
{
System.out.print("*");
}
//右下
for (int n = 9; n > m; n--)
{
System.out.print("*");
}
System.out.println();
}
}
}
![](https://images2015.cnblogs.com/blog/885594/201602/885594-20160226153732068-17611841.png)