Question

设计Java程序，使得当数组下标越界时提示（如图↓）

Answer 1

import java.util.Scanner;
 
/**
 * <P>
 * have the computer randomly pick a starting spot for the word. <br / > 
 * then separate the word into letters and put it into the matrix. <br / > 
 * at least 2 different directions must be used. <br / > 
 * vertically or horizontally or diagonally or backwards. <br / > 
 * if more than 2 are used extra credit is earned!! <br / > 
 * after the words have been placed in the matrix
 */
public class Polly
{
    enum DIRECTIONS
    {
        vertically, horizontally, diagonally, backwards
    }
 
    public static void main(String[] args)
    {
        String[][] matrix = new String[10][10];
        int rc = matrix.length;
        int cc = matrix[0].length;
        Scanner scanner = new Scanner(System.in);
        for(int i = 0; i < 10; i++)
        {
            System.out.print("input a word " + (i + 1) + " times: ");
            String word = scanner.next();
            int r = (int) (Math.random() * rc);
            int c = (int) (Math.random() * cc);
            while(true)
            {
                try
                {
                    DIRECTIONS direction = DIRECTIONS.values()[(int) (Math.random() * DIRECTIONS.values().length)];
                    switch(direction)
                    {
                        case vertically:
                            for(int j = r; j < rc; j++)
                            {
                                matrix[j][c] = word.charAt(j - r) + "";
                            }
                            break;
                        case horizontally:
                            for(int j = c; j < cc; j++)
                            {
                                matrix[r][j] = word.charAt(j - c) + "";
                            }
                            break;
                        case diagonally:
                            for(int j = 0; j < word.length(); j++)
                            {
                                matrix[r][c] = word.charAt(j) + "";
                                r++;
                                c++;
                            }
                            break;
                        case backwards:
                            for(int j = c; j >= 0; j--)
                            {
                                matrix[r][j] = word.charAt(c - j) + "";
                            }
                            break;
                    }
                }
                catch(StringIndexOutOfBoundsException | ArrayIndexOutOfBoundsException e)
                {
                    System.err.println("越界");
                    continue;
                }
                break;
            }
        }
        scanner.close();
        for(int i = 0; i < rc; i++)
        {
            for(int j = 0; j < cc; j++)
            {
                if(matrix[i][j] == null)
                {
                    int w = (int) (Math.random() * 26) + 65;
                    matrix[i][j] = (char) w + "";
                }
            }
        }
        System.out.println("the result is: ");
        for(int i = 0; i < rc; i++)
        {
            for(int j = 0; j < cc; j++)
            {
                System.out.print(matrix[i][j] + " ");
            }
            System.out.println();
        }
    }
}

追问

😂你现编的吗

追答

是的，今天早上写的。