Question

如何保存字符串和用户输入的字符串？下面给出错误。我该如何解决。可能存在更多错误。什么是“未封闭的字符串文字”？在Java中。

//Scanner sc = new Scanner(System.in);
//String userInput = sc.nextLine();
//String combining = "hey"+userInput;
//System.out.println(combining);

    import java.io.*;
    import java.util.*;
    public class FileWrite
    {
       public static void main(String[] args)
       {
        String input = null, file, fileName = null;

        try(BufferedReader br = new BufferedReader(new InputStreamReader(System.in)))
            {
            System.out.println("Enter the file name you wish to write the data");
            System.out.println("==============================================");
            Scanner sc = new Scanner(System.in);
                    fileName = sc.nextLine();           //accepting the name of the file
                    file = "C:\"+fileName+".txt";       //error line
                    file.readLine();                    //will this work?
            System.out.println("Enter your data");
            System.out.println("==============================================");
                System.out.println("");
            System.out.println("");
            do
            {
                input = br.readLine();                //accepting the data to write in the file
                if(input.toLowerCase().equals("end"))  //end to terminate the program
                            {
                    break;
                }
                else
                {
                    try(BufferedWriter bw = new BufferedWriter(new FileWriter(file, true)))
                    {
                        bw.write(input);
                        bw.newLine();
                    }
                    catch(IOException e)
                    {
                        System.out.println(e);
                        System.exit(0); 
                    }
                }
            }while(input != null);  
            }catch(Exception ex)
         {
                System.out.println(ex);
                    System.exit(0);   
             }
       }
    }

Answer 1

它表示未封闭的字符串文字。可能还有更多错误。

mv

Answer 2

我认为以下代码将帮助您将许多字符串写入新文件。

import java.io.*;
    //we did not use the classes of java.util package so let me remove it;
public class FileWrite1 {


    public static void main(String[] args) {

        //we will use file name in File class so let me remove String file
        String input = null, fileName = null;

        try (BufferedReader br = new BufferedReader(new InputStreamReader(System.in))) {
            System.out.println("Enter the file name you wish to write the data");
            System.out.println("==============================================");
            //Scanner class does not need because you have already use BufferedReader class
            //Scanner sc = new Scanner(System.in);
            //So, if you have BufferedReader class, let's use it below
            fileName = br.readLine();           //accepting the name of the file
            //if you want to create a new file using the name "fileName", you should use the class File.
            File file = new File("D:\\" + fileName + ".txt");

            //code in below is not necessary because of File class
            //file = "C:\"+fileName+".txt";       //error line

            //code in below will not work, because String file is not from BufferedReader class on your code, so let me take it to comment
            //file.readLine();                    //will this work?
            System.out.println("Enter your data");
            System.out.println("==============================================");
            System.out.println("");
            System.out.println("");

            do {
                input = br.readLine();                //accepting the data to write in the file
                if (input.toLowerCase().equals("end")) {  //end to terminate the program
                    break;
                } else {
                    // inside FileWriter object, you should use the object name of File Class, not String file
                    try (BufferedWriter bw = new BufferedWriter(new FileWriter(file, true))) {
                        bw.write(input);
                        bw.newLine();
                    } catch (IOException e) {
                        System.out.println(e);
                        System.exit(0);
                    }
                }
            } while (input != null);
        } catch (Exception ex) {
            System.out.println(ex);
            System.exit(0);
        }
    }
}

让我解释一下。

首先，如果我们拥有BufferedReader类，则可以使用它来获取输入，因此我们不应在您的代码中包含java.util包的类。
然后，String file不需要。因为，我们将使用file File类中的名称。因此，让我们将其保留在未来。
如上所述，如果我们有BufferedReader类，我们将能够获得输入，让我们使用它：fileName = br.readLine();
如果要将输入内容写入新文件，则应调用该类 File这样：
```
File file = new File("D:\\" + fileName + ".txt");
```
D：\是驱动器名称，fileName是在D上新创建的文件的名称 drive和.txt是文件的扩展名。
file.readLine（）;将不起作用，因为在您的代码中，字符串文件为不是来自BufferedReader类。
在FileWriter对象中，您应该使用File的对象名称类，而不是字符串文件

在您的IDE上运行此代码。不要忘记更改File类上的文件位置，在我的情况下，它位于D：\驱动器中。

是否保存字符串和用户输入的字符串？以下给出错误

2 个答案: