使用 Java 中的 Scanner 类读取 .txt 文件 [英] Reading a .txt file using Scanner class in Java

问题描述

我正在开发一个 Java 程序，它逐行读取文本文件，每个文件都有一个数字，将每个数字放入一个数组中，然后尝试使用插入排序对数组进行排序.我需要帮助让程序读取文本文件.

我收到以下错误消息:

<块引用>

java.io.FileNotFoundException: 10_Random (系统找不到指定的文件)在 java.io.FileInputStream.open(本机方法)在 java.io.FileInputStream.(来源不明)在 java.util.Scanner.(来源不明)在 insertSort.main(insertionSort.java:14)

我的src"bin"和主项目文件夹中有 .txt 文件的副本，但它仍然找不到该文件.顺便说一下，我正在使用 Eclipse.

import java.io.File;导入 java.io.FileNotFoundException;导入 java.util.Scanner;公共类插入排序{公共静态无效主(字符串 [] args){File file = new File("10_Random");尝试 {扫描仪 sc = 新扫描仪(文件)；而 (sc.hasNextLine()) {int i = sc.nextInt();System.out.println(i);}sc.close();}抓住(FileNotFoundException e){e.printStackTrace();}}}

解决方案

你必须把文件扩展名放在这里

File file = new File("10_Random.txt");

I am working on a Java program that reads a text file line-by-line, each with a number, takes each number throws it into an array, then tries and use insertion sort to sort the array. I need help with getting the program to read the text file.

I am getting the following error messages:

java.io.FileNotFoundException: 10_Random (The system cannot find the file specified)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(Unknown Source)
at java.util.Scanner.<init>(Unknown Source)
at insertionSort.main(insertionSort.java:14)

I have a copy of the .txt file in my "src" "bin" and main project folder but it still cannot find the file. I am using Eclipse by the way.

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;

public class insertionSort {

public static void main(String[] args) {

    File file = new File("10_Random");

    try {

        Scanner sc = new Scanner(file);

        while (sc.hasNextLine()) {
            int i = sc.nextInt();
            System.out.println(i);
        }
        sc.close();
    } 
    catch (FileNotFoundException e) {
        e.printStackTrace();
    }
 }
}

解决方案

You have to put file extension here

File file = new File("10_Random.txt");

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