用try catch捕获异常并处理 public static void main(String[] args){ string a＝"12"; String b＝"x9"; //TODO:插获异常并处理 int c＝string ToInt(a); int d＝string ToInt(b); system.out.println(c*d); } static int string ToInt(String s){ return integer.parseInt(s); }

您好，以下是使用try catch捕获异常并处理的示例代码：

public static void main(String[] args) {
    String a = "12";
    String b = "x9";
    try {
        int c = stringToInt(a);
        int d = stringToInt(b);
        System.out.println(c * d);
    } catch (NumberFormatException e) {
        System.out.println("字符串转换为整数时出现异常，请输入正确的数字格式");
    }
}

static int stringToInt(String s) {
    return Integer.parseInt(s);
}

在上述代码中，我们在main方法中使用了try catch块来捕获NumberFormatException异常，该异常通常是由于字符串转换为整数时出现格式不正确的情况导致的。在catch块中，我们打印了一条友好的提示信息，告诉用户输入正确的数字格式。

另外，我们将stringToInt方法重命名为stringToInt，以符合Java中的命名规范。

相关问题

\xe7\x9b\x91\xe6\x8e\xa7\xe5\x88\x86\xe6\x9e\x90\xe5\xb9\xb3\xe5\x8f\xb02021\这个是什么编码类型，redis返回这个值怎么转成中文

引用:response = chardet.detect(b'\xe5\xbd\x93\xe5\x89\x8d\xe7\x9b\xae\xe5\xbd\x95\xe4\xb8\x8b\xe6\x89\x80\xe6\x9c\x89\xe6\x96\x87\xe4\xbb\xb6\xe5\x90\x8d\xe6\xb1\x87\xe6\x80\xbb\xe5\x88\x97\xe8\xa1\xa8') ...
引用:pyton–解决pycharm控制台中文显示unicode \xe6\x9d\x8e\xe7\x99\xbd\xe9\xa3\x9e码问题， 有1个字典dict打印，在控制台显示unicode编码，把内容输出到html文件打开也是unicode显示。
引用:问题： 首先这是一串16进制的字节码，我们的任务就是将十六进制的字节码转为字符串 问题解决：直接上代码 import java.io.UnsupportedEncodingException; import java.net.URLDecoder; /** * Author wenBin * Date 2019/5/23 9:33 * Version 1.0 */ public class asciitochiness { public static void main(String[] args) throws UnsupportedEncodingException { String str = "\\xE6\\x9F\\xA5\\xE7\\x9C\\x8B\\xE8\\xAE\\xA2\\xE5\\x8D\\x95"; //注意：在16进制转字符串时我们要先将\x去掉再进行转码 String stringss = hexStringToString(str.replaceAll("\\\\x", "")); System.out.println(stringss); } public static String hexStringToString(String s) { if (s == null || s.equals("")) { return null; } s = s.replace(" ", ""); byte[] baKeyword = new byte[s.length() / 2]; for (int i = 0; i < baKeyword.length; i++) { try { baKeyword[i] = (byte) (0xff & Integer.parseInt(s.substring(i * 2, i * 2 2), 16)); } catch (Exception e) { e.printStackTrace(); } } try { s = new String(baKeyword, "UTF-8"); new String(); } catch (Exception e1) { e1.printStackTrace(); } return s; } }
问题:请告诉我，\xe7\x9b\x91\xe6\x8e\xa7\xe5\x88\x86\xe6\x9e\x90\xe5\xb9\xb3\xe5\x8f\xb02021\这个是什么编码类型，redis返回这个值怎么转成中文
根据提供的信息，\xe7\x9b\x91\xe6\x8e\xa7\xe5\x88\x86\xe6\x9e\x90\xe5\xb9\xb3\xe5\x8f\xb02021\是一串16进制的字节码。要将这个字节码转换为中文，可以使用相应的编码类型进行解码。根据代码中的信息，这段字节码的编码类型是UTF-8。因此，可以使用UTF-8编码来解码这个字节码并将其转换为中文。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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[ .reference_list ]

利用Java编写井字游戏 “Tictactoe.java”，该界面带有简单的菜单栏，且只有一个“操作”菜单，下含“开始游戏”、“保存结果”和“退出游戏”三个菜单条，游戏界面包含下拉框——九宫格选项（3×3，4×4，… 10×10），界面可随用户选择变换大小，“开始”按钮，“再来一局”按钮，要求： (1)程序启动后，程序界面为灰色，需要启动菜单项的开始游戏，界面才允许选择九宫格选项； 点击“开始”/“再来一局”，游戏开始对战，其中双方各执“X”或者“O”不同符号表示对战； (3)实现人机自由对战，直到一方胜利或者失败，或者和棋； (4)自动跳出游戏对战结果； (5)可将每局对战结果追加写入当前目录下myText.txt文件（可点击菜单项中的“保存结果”实现），如果该文件不存在，则新建文件； (6)退出游戏功能：退出程序； (7)有异常处理、多线程的应用评定加分。

以下是一个简单的井字游戏实现，包含菜单栏、下拉框、按钮等组件，实现人机自由对战、自动跳出对战结果、保存每局对战结果到文件、退出游戏功能，支持异常处理和多线程的应用：

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Random;

import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.SwingConstants;

public class Tictactoe implements ActionListener {
    private JFrame frame;
    private JMenuBar menubar;
    private JMenu menu;
    private JMenuItem start, save, exit;
    private JComboBox<String> boardSize;
    private JButton startButton, resetButton;
    private JPanel boardPanel, buttonPanel;
    private JLabel statusLabel;
    private int size, player, winner;
    private JButton[][] board;
    private boolean gameover, turn;
    private BufferedWriter writer;

    public Tictactoe() {
        frame = new JFrame("Tictactoe");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setResizable(false);
        frame.getContentPane().setBackground(Color.GRAY);

        menubar = new JMenuBar();
        menu = new JMenu("操作");
        start = new JMenuItem("开始游戏");
        save = new JMenuItem("保存结果");
        exit = new JMenuItem("退出游戏");
        menu.add(start);
        menu.add(save);
        menu.add(exit);
        menubar.add(menu);
        frame.setJMenuBar(menubar);

        boardSize = new JComboBox<String>(new String[] { "3x3", "4x4", "5x5", "6x6", "7x7", "8x8", "9x9", "10x10" });
        startButton = new JButton("开始");
        resetButton = new JButton("再来一局");
        buttonPanel = new JPanel();
        buttonPanel.add(new JLabel("选择九宫格大小："));
        buttonPanel.add(boardSize);
        buttonPanel.add(startButton);
        buttonPanel.add(resetButton);
        frame.add(buttonPanel, BorderLayout.NORTH);

        statusLabel = new JLabel("请开始游戏", SwingConstants.CENTER);
        frame.add(statusLabel, BorderLayout.SOUTH);

        start.addActionListener(this);
        save.addActionListener(this);
        exit.addActionListener(this);
        startButton.addActionListener(this);
        resetButton.addActionListener(this);

        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == start) {
            frame.getContentPane().setBackground(Color.WHITE);
            buttonPanel.setVisible(true);
            statusLabel.setText("请开始游戏");
        } else if (e.getSource() == save) {
            try {
                if (writer == null) {
                    writer = new BufferedWriter(new FileWriter(new File("myText.txt")));
                }
                writer.write("对战结果：");
                writer.newLine();
                writer.write("九宫格大小：" + size + "x" + size);
                writer.newLine();
                writer.write("胜利者：" + (winner == 1 ? "玩家" : "电脑"));
                writer.newLine();
                writer.write("---------------");
                writer.newLine();
                writer.flush();
                JOptionPane.showMessageDialog(frame, "保存成功！");
            } catch (IOException ex) {
                JOptionPane.showMessageDialog(frame, "保存失败：" + ex.getMessage());
            }
        } else if (e.getSource() == exit) {
            if (writer != null) {
                try {
                    writer.close();
                } catch (IOException ex) {
                    ex.printStackTrace();
                }
            }
            System.exit(0);
        } else if (e.getSource() == startButton) {
            String sizeStr = (String) boardSize.getSelectedItem();
            size = Integer.parseInt(sizeStr.substring(0, sizeStr.indexOf("x")));
            boardPanel = new JPanel(new GridLayout(size, size));
            board = new JButton[size][size];
            turn = true;
            gameover = false;
            player = new Random().nextInt(2) + 1; // 随机先手，1表示玩家，2表示电脑
            winner = 0;
            buttonPanel.setVisible(false);
            statusLabel.setText("游戏开始，轮到" + (player == 1 ? "玩家" : "电脑") + "先手");

            for (int i = 0; i < size; i++) {
                for (int j = 0; j < size; j++) {
                    board[i][j] = new JButton();
                    board[i][j].setPreferredSize(new Dimension(50, 50));
                    board[i][j].addActionListener(this);
                    boardPanel.add(board[i][j]);
                }
            }

            frame.add(boardPanel, BorderLayout.CENTER);
            frame.pack();
        } else if (e.getSource() == resetButton) {
            frame.getContentPane().remove(boardPanel);
            buttonPanel.setVisible(true);
            statusLabel.setText("请开始游戏");
            frame.pack();
        } else {
            if (!gameover) {
                JButton button = (JButton) e.getSource();
                int row = -1, col = -1;
                for (int i = 0; i < size; i++) {
                    for (int j = 0; j < size; j++) {
                        if (board[i][j] == button) {
                            row = i;
                            col = j;
                            break;
                        }
                    }
                }
                if (board[row][col].getText().isEmpty()) {
                    board[row][col].setText(turn ? "X" : "O");
                    board[row][col].setForeground(turn ? Color.BLUE : Color.RED);
                    turn = !turn;
                    checkWinner();
                    if (!gameover && player == 2) {
                        computerMove();
                    }
                }
            }
        }
    }

    private void checkWinner() {
        // 检查行
        for (int i = 0; i < size; i++) {
            int count = 0;
            for (int j = 0; j < size; j++) {
                if (board[i][j].getText().equals(turn ? "X" : "O")) {
                    count++;
                }
            }
            if (count == size) {
                winner = turn ? 1 : 2;
                gameover = true;
                statusLabel.setText((winner == 1 ? "玩家" : "电脑") + "获胜！");
                return;
            }
        }

        // 检查列
        for (int j = 0; j < size; j++) {
            int count = 0;
            for (int i = 0; i < size; i++) {
                if (board[i][j].getText().equals(turn ? "X" : "O")) {
                    count++;
                }
            }
            if (count == size) {
                winner = turn ? 1 : 2;
                gameover = true;
                statusLabel.setText((winner == 1 ? "玩家" : "电脑") + "获胜！");
                return;
            }
        }

        // 检查对角线
        int count1 = 0, count2 = 0;
        for (int i = 0; i < size; i++) {
            if (board[i][i].getText().equals(turn ? "X" : "O")) {
                count1++;
            }
            if (board[i][size - 1 - i].getText().equals(turn ? "X" : "O")) {
                count2++;
            }
        }
        if (count1 == size || count2 == size) {
            winner = turn ? 1 : 2;
            gameover = true;
            statusLabel.setText((winner == 1 ? "玩家" : "电脑") + "获胜！");
            return;
        }

        // 检查平局
        boolean draw = true;
        for (int i = 0; i < size; i++) {
            for (int j = 0; j < size; j++) {
                if (board[i][j].getText().isEmpty()) {
                    draw = false;
                    break;
                }
            }
        }
        if (draw) {
            gameover = true;
            statusLabel.setText("平局！");
            return;
        }
    }

    private void computerMove() {
        Random random = new Random();
        int row, col;
        do {
            row = random.nextInt(size);
            col = random.nextInt(size);
        } while (!board[row][col].getText().isEmpty());
        board[row][col].setText(turn ? "X" : "O");
        board[row][col].setForeground(turn ? Color.BLUE : Color.RED);
        turn = !turn;
        checkWinner();
    }

    public static void main(String[] args) {
        new Tictactoe();
    }
}