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I have a file name reader from a folder.file`s names taken into a string array.what i want is when i executed this code segment i want the file name without its extension. But still extensions get printed out.

import java.io.File;
public class Main {

    public static void main(String[] args) {
        File file=new File("D:\\C_App\\PDF");
        String[] files = file.list();
        for(String string : files) {
            string.substring(0, string.length());
            System.out.println(string);
        }
    }
}

Can anyone help me to solve this? Thanks.

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2
  • 2
    Just so you ALL know...A file name doesn't necessarily need to contain a file name extension. NONE of your answers takes this into account. @D.Anush - Check out the thread in this SO Post. Commented Aug 22, 2018 at 5:23
  • 1
    Strings are immutable in java. The substring method returns a new string that you need to assign to a variable. Commented Aug 22, 2018 at 8:45

3 Answers 3

Reset to default
1

Take substring of string from the last index of .

import java.io.File;
public class Main {

    public static void main(String[] args) {
        File file=new File("D:\\C_App\\PDF");
        String[] files = file.list();
        for(String string : files) {
             if(new File(string).isFile){ 
               if (string.lastIndexOf(".") > 0) {
                  System.out.println(string.substring(0, a.lastIndexOf('.'));
               }
            else {
               System.out.println(string);
            }
           }
        }
    }
}
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12 Comments

it gives Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0 at Main.main(Main.java:9). im very new to programming pls help
Can you print file name?
No nothing prints out except that exception.
Do System.out.println(string); and tell me the output.
File name get printed out with the extension.
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0

Here is the Solution:

public static void main(String[] args) {
    File file = new File("D:\\SunilKanjar");
    String[] files = file.list();
    for (String string : files) {
        if (string.lastIndexOf(".") > 0) {
            System.out.println(string.substring(0, string.lastIndexOf(".")));
        }
    }
}

To get file name without extension first of all we need to find is there any extension or not and then need to remove extension only and for that find . at from the last.

It is not accurate to assume that file name not contain more then one . sign.

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Comments

0

using regex by matching the last dot ( . ) and split,

the regex (\\.)(?!.*\\.) matches the last dot.

import java.io.File;
public class Main {
public static void main(String[] args) {
    File file=new File("D:\\C_App\\PDF");
    String[] files = file.list();
    for(String string : files) {
      if (!string.isEmpty()) {
        System.out.println(string.split("(\\.)(?!.*\\.)")[0]);
      }
    }
}
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2 Comments

This would be the route I would of taken however I would of also added: if (new File(string).isDirectory()) { continue; } to ignore directories names within the list.
@D.Anush can you mark it an answer if it answers your question?

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