//输出三角形//左下
for(int m = 1; m <= 10; m++)
{for (int n = 1; n <= m; n++)
{
System.out.print("*");
}
System.out.println();
}//左上(1)
for(int m = 1; m <= 10; m++)
{for (int n = 10; n >= m; n--)
{
System.out.print("*");
}
System.out.println();
}//左上(2)
for(int m = 9; m >= 1; m--)
{for (int n = 1; n <= m; n++)
{
System.out.print("*");
}
System.out.println();
}//右下
for (int m = 1; m <= 10; m++)
{//输出空格
for (int n = 9; n >= m ;n--)
{
System.out.print(" ");
}//输出*
for (int n = 1; n <= m; n++)
{
System.out.print("*");
}
System.out.println();
}//右上(1)
for (int m = 1; m <= 9; m++)
{//输出空格
for (int n = 1; n <= m ;n++)
{
System.out.print(" ");
}//输出*
for (int n = 9; n >= m; n--)
{
System.out.print("*");
}
System.out.println();
}//右上(2)
for (int m = 10; m >= 1; m--)
{//输出空格
for (int n = 9; n >= m ;n--)
{
System.out.print(" ");
}//输出*
for (int n = 1; n <= m; n++)
{
System.out.print("*");
}
System.out.println();
}
