编写Java程序，应用for循环打印菱形、三角形

    package com.hanqi;

public class Test10 {

    public static void main(String[] args) {
        //菱形
        

        //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();
        }    
        
    }

}

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

                //左上
                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();
                }
        //左下(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();
                }
                //左下(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();
                }