Question

我的编码出了什么问题？我试图创建一个文件名＆amp;打印输出在文本文件中包实用12;

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

   public class q4 {
    public static void main (String []args) throws FileNotFoundException{
System.out.println("please input file name");

String name;
//take file name
Scanner in;
in = new Scanner(System.in);
name = in.nextLine();
PrintWriter out = new PrintWriter(name);
    // create textfile
out.println("Hello! My first program in File");
// write the text
out.close();
    //close the file
}
}

Answer 1

如果您刚刚输入了文件名而不是绝对路径，那么它将在您程序的当前工作目录中创建。要使用java检查当前工作目录，请检查Getting the Current Working Directory in Java

Answer 2

当你给程序提供文件名时，最后必须有.txt或其他东西。如果没有fileWriter则无法创建文件并抛出错误。如果你想确保程序点崩溃就是一个例子。

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

   public class q4 {
   public static void main (String []args) throws FileNotFoundException{
System.out.println("please input file name");

String name;
//take file name
Scanner in;
in = new Scanner(System.in);
name = in.nextLine();
PrintWriter out = new PrintWriter(name+".txt");
// create textfile
out.println("Hello! My first program in File");
// write the text
out.close();
//close the file
}
}

我无法创建该文件

2 个答案: