java程序设计课后习题

Question

本人初学者在书上看到这个编程题弄了很久都没做出来

Answer 1

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();
    }    

}
}