英文:
Try{} Catch {} in Java is executing catch before try{}
问题
我遇到一个问题，无法摆脱它。
我正在运行以下代码，对于这个输入：
*输入单元格：XXOO_OX
| X X |
| O O |
| O X |
输入坐标：您应该输入数字！
输入坐标：one
您应该输入数字！
输入坐标：ont three
您应该输入数字！
输入坐标：1 3
| X X X |
| O O |
| O X |
进程退出，退出代码为0*
运行后，我在输入坐标之前捕获到异常消息。为什么？我应该更改什么？
Scanner scanner = new Scanner(System.in);String[][] tictactoe = new String[3][3];// 初始化方法System.out.print("输入单元格：");String s = scanner.next();String a = s.substring(0, 1);tictactoe[0][0] = a;String b = s.substring(1, 2);tictactoe[0][1] = b;String c = s.substring(2, 3);tictactoe[0][2] = c;String d = s.substring(3, 4);tictactoe[1][0] = d;String e = s.substring(4, 5);tictactoe[1][1] = e;String f = s.substring(5, 6);tictactoe[1][2] = f;String g = s.substring(6, 7);tictactoe[2][0] = g;String h = s.substring(7, 8);tictactoe[2][1] = h;String i = s.substring(8, 9);tictactoe[2][2] = i;for (int n = 0; n < 3; n++) {for (int m = 0; m < 3; m++) {String cuv = tictactoe[n][m];if (cuv.equals("_")) {tictactoe[n][m] = " ";}}}System.out.println("---------");System.out.println("| " + tictactoe[0][0] + " " + tictactoe[0][1] + " " + tictactoe[0][2] + " |");System.out.println("| " + tictactoe[1][0] + " " + tictactoe[1][1] + " " + tictactoe[1][2] + " |");System.out.println("| " + tictactoe[2][0] + " " + tictactoe[2][1] + " " + tictactoe[2][2] + " |");String player1 = "X";String letter;boolean correctCoordinate = false;while (!correctCoordinate) {System.out.print("输入坐标：");String input = scanner.nextLine();String[] pieces = input.trim().split("\\s+");int x;int y;try {x = Integer.parseInt(pieces[0]);y = Integer.parseInt(pieces[1]);letter = tictactoe[3 - y][x - 1];if (letter.equals("X") || letter.equals("O")) {System.out.println("该单元格已被占用！请选择其他单元格！");} else {tictactoe[3 - y][x - 1] = player1;System.out.println("---------");System.out.println("| " + tictactoe[0][0] + " " + tictactoe[0][1] + " " + tictactoe[0][2] + " |");System.out.println("| " + tictactoe[1][0] + " " + tictactoe[1][1] + " " + tictactoe[1][2] + " |");System.out.println("| " + tictactoe[2][0] + " " + tictactoe[2][1] + " " + tictactoe[2][2] + " |");System.out.println("---------");correctCoordinate = true;}} catch (NumberFormatException err1) {System.out.println("您应该输入数字！");} catch (ArrayIndexOutOfBoundsException err2) {System.out.println("坐标应该在1到3之间！");}}
谢谢，
Florin
英文:
I am having an issue that I cannot get rid off.
I am running the code from bellow and for this input:
*Enter cells: XXOO_OX
| X X |
| O O |
| O X |
Enter the coordinates:You should enter numbers!
Enter the coordinates:one
You should enter numbers!
Enter the coordinates:ont three
You should enter numbers!
Enter the coordinates:1 3
| X X X |
| O O |
| O X |
Process finished with exit code 0*
and after running it I get the catch message before I input the coordinates. Why? What should I change?
Scanner scanner = new Scanner(System.in);
String[][] tictactoe = new String[3][3];
//init methodSystem.out.print("Enter cells: ");String s = scanner.next();String a = s.substring(0, 1);tictactoe[0][0] = a;String b = s.substring(1, 2);tictactoe[0][1] = b;String c = s.substring(2, 3);tictactoe[0][2] = c;String d = s.substring(3, 4);tictactoe[1][0] = d;String e = s.substring(4, 5);tictactoe[1][1] = e;String f = s.substring(5, 6);tictactoe[1][2] = f;String g = s.substring(6, 7);tictactoe[2][0] = g;String h = s.substring(7, 8);tictactoe[2][1] = h;String i = s.substring(8, 9);tictactoe[2][2] = i;for (int n = 0; n < 3; n++) {for (int m = 0; m < 3; m++) {String cuv = tictactoe[n][m];if (cuv.equals("_")) {tictactoe[n][m] =" ";}}}System.out.println("---------");System.out.println("| " + tictactoe[0][0] + " " + tictactoe[0][1] + " " + tictactoe[0][2] + " |");System.out.println("| " + tictactoe[1][0] + " " + tictactoe[1][1] + " " + tictactoe[1][2] + " |");System.out.println("| " + tictactoe[2][0] + " " + tictactoe[2][1] + " " + tictactoe[2][2] + " |");System.out.println("---------");String player1 = "X";String letter;boolean correctCoordinate=false;while (!correctCoordinate){System.out.print("Enter the coordinates:");String input=scanner.nextLine();String [] pieces = input.trim().split("\\s+");int x;int y;try {x = Integer.parseInt(pieces[0]);y = Integer.parseInt(pieces[1]);letter = tictactoe[3-y][x-1];if (letter.equals("X") || letter.equals("O")) {System.out.println("This cell is occupied! Choose another one!");} else {tictactoe[3-y][x-1]=player1;System.out.println("---------");System.out.println("| " + tictactoe[0][0] + " " + tictactoe[0][1] + " " + tictactoe[0][2] + " |");System.out.println("| " + tictactoe[1][0] + " " + tictactoe[1][1] + " " + tictactoe[1][2] + " |");System.out.println("| " + tictactoe[2][0] + " " + tictactoe[2][1] + " " + tictactoe[2][2] + " |");System.out.println("---------");correctCoordinate=true;}}catch (NumberFormatException err1) {System.out.println("You should enter numbers!");}catch (ArrayIndexOutOfBoundsException err2){System.out.println("Coordinates should be from 1 to 3!");}}
Thank you,
Florin
答案1
得分: 1
调试代码的最佳方法是使用堆栈跟踪。
尝试添加以下代码块：
catch (NumberFormatException err1) {err1.printStackTrace();System.out.println("您应该输入数字！");} catch (ArrayIndexOutOfBoundsException err2) {err2.printStackTrace();System.out.println("坐标应该在1到3之间！");}
这样你可以追踪你的问题。
希望这对你有帮助。
祝你有一个愉快的一天 
英文:
The best way to debug your code is by stack tracing.
Try adding
catch (NumberFormatException err1) {err1.printStackTrace();System.out.println("You should enter numbers!");}catch (ArrayIndexOutOfBoundsException err2){err2.printStackTrace();System.out.println("Coordinates should be from 1 to 3!");}
This way you can trace your issue.
Hope it was helpful.
Have a nice day
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