Count the lines in a text file java

For the casual reader, please note readAllLines is not intented for reading large files. Or the shortcut Files. Thanks MattByrne, I've edited the answer according to your suggestion — superbob. Given how Java 8 streams work, I suppose it is a good method for large files also. However it should be tested to make it sure. Community Bot 1 1 1 silver badge.

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Until then, please provide answers that don't require clarification from the asker. Woah, that's nice of you I just wanted to give extra informations to people reading that page, and that's the only way I could've think of, at this moment. Crimin4L Crimin4L 1 1 gold badge 5 5 silver badges 15 15 bronze badges. Ooops, sorry thought this was php, not java :L Couldn't you use BufferedReader to do this process? Sorry if I am incorrect :P — Crimin4L. Sign up or log in Sign up using Google.

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Reference Materials String. Start Learning Java. Explore Java Examples. Create String from Contents of a File. Append Text to an Existing File. Convert File to byte array and Vice-Versa. Counting the number of characters is essential because almost all the text boxes that rely on user input have certain limitations on the number of characters inserted.

For example, the character limit on a Facebook post is characters. Whereas for a tweet on Twitter, the character limit is characters, and the character limit is 80 per post for Snapchat. Determining character limits become crucial when the tweet and Facebook post updates are being done through APIs.

In-built Functions Used 1. File String pathname : This function is present under the java. File package. It creates a new File instance by converting the given pathname string into an abstract pathname. Syntax: public File String pathname Parameters:. This function is present under the java. FileInputStream package. It creates a FileInputStream by opening a connection to an actual file named by the File object file in the file system.

Throws: FileNotFoundException — if the file does not exist, is a directory rather than a regular file, or for some other reason cannot be opened for reading. SecurityException — if a security manager exists and its checkRead method denies read access to the file.