Question

我正在尝试使用扫描仪从文本文件中提取令牌，文本文件的名称为“ElectricToolData.txt”，

文本文件的内容：

// this is a comment, any lines that start with //
// (and blank lines) should be ignored

// data is rechargeable, power, toolName, itemCode, timesBorrowed, onLoan, cost, weight
true,18V,Makita BHP452RFWX,RD2001,12,false,14995,1800
true,10.8V,Flex Impact Screwdriver FIS439,RD2834,14,true,13499,1200     
false,1350W,DeWalt D23650-GB Circular Saw, RD6582,54,true,14997,5400
false,1500W,Milwaukee DD2-160XE Diamond Core Drill,RD4734,50,false,38894,9000
true,10.8V,Bosch GSR10.8-Li Drill Driver,RD3021,25,true,9995,820
 false,900W,Bosch GSB19-2REA Percussion Drill,RD8654,85,false,19999,4567
true,10.8V,Flex Impact Screwdriver FIS439, RD2835,14,false,13499,1200 
true,18V,DeWalt DW936 Circular Saw,RD4352,18,false,19999,3300 
false,2100W,Sparky FK652 Wall Chaser,RD7625,15,false,29994,8400

以下是我尝试使用不成功的扫描程序从文本文件中提取令牌的尝试：

错误消息（行扫描程序扫描程序）：未报告的异常java.io.FileNotFoundException;必须被抓或宣布被抛出。

public void extractTokens()
    {
        //extracts tokens from the text file
        File text = new File("E:/LEWIS BC 2/project 1/ElectricToolData.txt");

       Scanner scanner = new Scanner(text);

       String toolName = scanner.next();
       String itemCode = scanner.next();
       String power = scanner.next();
       String timesBorrowed = scanner.next();
       String onLoan = scanner.next();
       String cost = scanner.next();
       String weight = scanner.next();

       //System.out.println(parts.get(1)); // "en"
    }

任何回复或帮助都会非常感激，因为我真的很困惑。

Answer 1

抛出或捕获＆＃34; FileNotFoundException＆＃34;

我怀疑你没有使用像Eclipse或IntelliJ这样的IDE。它会在那里发出编译警告。无论如何这个代码应该工作

public void extractTokens() throws FileNotFoundException
    {
        // extracts tokens from the text file
        File text = new File("E:/LEWIS BC 2/project 1/ElectricToolData.txt");

        Scanner scanner = new Scanner(text);

        String toolName = scanner.next();
        String itemCode = scanner.next();
        String power = scanner.next();
        String timesBorrowed = scanner.next();
        String onLoan = scanner.next();
        String cost = scanner.next();
        String weight = scanner.next();

        // System.out.println(parts.get(1)); // "en"
    }

Answer 2

您可能会遇到IOException和/或FileNotFoundException，因此您应该捕获这两个：

public void extractTokens() throws IOException, FileNotFoundException{

    }

从文本文件java中提取标记

2 个答案: