4个方位的三角形和菱形

//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();
}
//
//
//
//
//                //菱形(方法一)
//                //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();
}
//菱形(方法二)
int x=0;
int x1=0;
for(int i=0;i<5;i++){
for(int j=0;j<10;j++){
x=5+i;
x1=5-i;
if(j>=x1&&j<=x){System.out.print    ("*");}
else{System.out.print(" ");}
}
System.out.println();
}
int x3=0;
int x4=0;
for(int i=1;i<5;i++){
for(int j=0;j<10;j++){
x3=i;
x4=10-i;
if(j>x3&&j<x4){System.out.print    ("*");}
else{System.out.print(" ");}
}
System.out.println();
}