跪求如何用Array写这个程序
题目要求如下
1，使用二维阵列去储存值
2，让阵列的大小是20*20，（type char arr[20][20]).这个画布的大小是固定的，所有的值都储存在这个画布当中。
3，这个程序可以让用户选择画出的图形形状。
4，画出一个矩形，让用户输入行数和列数以及ASCII 字符和矩形在画布中的位置的位置。
5，确保产生的图形是由用户输入的ASCII字符组成的。("*", "$", Anything on the keyboard!)。
示例1如下
1.Type S to draw a rectangle
2.Type T to draw a Triangle
3.Type D to Display
4.Type Q to Quit
S
Enter Height
3
Enter Width
4
Enter character
$
Enter location on canvas (x and y coordinate)
3
3
1.Type S to draw a rectangle
2.Type T to draw a Triangle
3.Type D to Display
4.Type Q to Quit
D



$$$$
$$$$
$$$$













1.Type S to draw a rectangle
2.Type T to draw a Triangle
3.Type D to Display
4.Type Q to Quit
S
Enter Height
5
Enter Width
5
Enter character
@
Enter location on canvas (x and y coordinate)
6
6
1.Type S to draw a rectangle
2.Type T to draw a Triangle
3.Type D to Display
4.Type Q to Quit
D



$$$$
$$$$
$$$$
@@@@@
@@@@@
@@@@@
@@@@@
@@@@@

-------------------------------------------------------------------------

示例2如下
1.Type S to draw a rectangle
2.Type T to draw a Triangle
3.Type D to Display
4.Type Q to Quit
S
Enter Height
3
Enter Width
3
Enter character
$
Enter location on canvas (x and y coordinate)
2
3
1.Type S to draw a rectangle
2.Type T to draw a Triangle
3.Type D to Display
4.Type Q to Quit
S
Enter Height
5
Enter Width
6
Enter character
#
Enter location on canvas (x and y coordinate)
2
5
1.Type S to draw a rectangle
2.Type T to draw a Triangle
3.Type D to Display
4.Type Q to Quit
D


$$######
$$######
$$######
######
######













1.Type S to draw a rectangle
2.Type T to draw a Triangle
3.Type D to Display
4.Type Q to Quit
S
Enter Height
5
Enter Width
5
Enter character

?
Enter location on canvas (x and y coordinate)
5
2
1.Type S to draw a rectangle
2.Type T to draw a Triangle
3.Type D to Display
4.Type Q to Quit
D


$$######
$$######
$$######
?????####
?????####
?????
?????
?????


恳请各位大神写出完整代码，谢谢了，以上内容是我翻译的，原题在下面的网址，代码只用显示矩形就行了。
原题网址：https://wiki.ittc.ku.edu/ittc/EECS168:Lab9









[解决办法]
所有都写太复杂，写了一个简陋的，没有check，
你自己改改吧。。。

Java code

import java.util.Scanner;public class Test {    private static char arr[][] = new char[20][20];    public static void main(String[] arg) throws Exception {                for (int i = 0; i < 20; i++) {            for (int j = 0; j < 20; j++) {                arr[i][j] = ' ';            }        }        System.out.println("1.Type S to draw a rectangle");        System.out.println("2.Type T to draw a Triangle");        System.out.println("3.Type D to Display");        System.out.println("4.Type Q to Quit");        Scanner s = new Scanner(System.in);        String p = s.next();        if ("S".equals(p.toUpperCase())) {            System.out.println("Enter Height");            int h = s.nextInt();            System.out.println("Enter Width");            int w = s.nextInt();            System.out.println("Enter character");            p = s.next();            System.out.println("Enter location on canvas (x and y coordinate)");            int x = s.nextInt();            int y = s.nextInt();            for (int i = x; i < x + w; i++) {                for (int j = y; j < y + h; j++) {                    arr[i][j] = p.toCharArray()[0];                }            }        }        p = s.next();        if ("D".equals(p.toUpperCase())) {            for (int i = 0; i < 20; i++) {                for (int j = 0; j < 20; j++) {                    System.out.print(arr[i][j]);                }                System.out.println();            }        }    }}
[解决办法]
探讨

继续输个 D 
才会打印结果的。