收到错误 - 'java：未报告的异常 java.io.FileNotFoundException;必须被抓住或宣布被抛出' [重复]

Question

导入 java.util.; 导入 java.io.;

公共类主要{ public static void main(String args[]){

    int total = 0;

    File file = new File("expenditure.txt");
    Scanner fileScanner = new Scanner(file);

    while (fileScanner.hasNextLine()) {
        total += fileScanner.nextInt();
        }
        fileScanner.close();

    System.out.println("The total expenditure is " + total);
}

}

Answer 1

用try-catch包围您对文件的阅读，示例代码如下：

import java.util.*;
import java.io.*;

public class Main {
    public static void main(String args[]){

        try {
            int total = 0;

            File file = new File("expenditure.txt");
            Scanner fileScanner = new Scanner(file);

            while (fileScanner.hasNextLine()) {
                total += fileScanner.nextInt();
            }
            fileScanner.close();

            System.out.println("The total expenditure is " + total);
        } catch (FileNotFoundException ex){
            System.out.println("File not found");
        }
    }
}