- Java Create New File With Text Messages
- Powershell Create New File With Text
- Java Create A File With Text
The java.io.File.createNewFile method atomically creates a new file named by this abstract path name. FileLock facility should be used instead of this method for file-locking as the resulting protocol cannot be made to work reliably. Following is the declaration for java.io.File.createNewFile method − public boolean. Create a new Java project 'de.vogella.itext.readpdf' with the package 'de.vogella.itext.read'. Create a folder 'lib' and put the iText library (jar file) into this folder. Add the jar to your classpath. Create the following class 'ReadAndUsePdf.java'.
Creating a new file in Java is a very easy task. In this Java tutorial, we will list down different ways to create a new file.
Read More: Create a read only file in Java
1. Create file with java.nio.file.Files
Files.write() is best way to create a new file in Java and it should be your preferred approach in future if you are not already using it.
- Write a method to create a text file named numbers.txt that is to contain the whole numbers 101 to 10000 (use a for loop to write the output to the file). Write a second method that will read the data from numbers.txt and display the content to the screen (one value per line of output).
- Import java.io.File; // Import the File class File myObj = new File('filename.txt'); // Specify the filename If you don't know what a package is, read our Java Packages Tutorial. The File class has many useful methods for creating and getting information about files.
This method writes lines of text to the created file. Each line is a char sequence and is written to the file in sequence with each line terminated by the platform’s line separator.
Method Syntax
Example 1: Check if a file already exist in Java
LinkOption.NOFOLLOW_LINKS
indicates that the application should not follow symbolic links in the file system to determine if the path exists.Example 2: Create a new file or append to an existing file
Use StandardOpenOption to indicate if a new file has to be created or not.
Example 3: Create a new file with default options
If we do not specify any
options
parameter then by default, CREATE
, TRUNCATE_EXISTING
, and WRITE
options are use.It does the following things:
Java Create New File With Text Messages
- Opens the file for write if exist
- Creates the file if the file doesn’t exist
- Opens the file for writing
- Deletes all the file content
- Write the new content into the file
2. Create new file with java.io.File class
Use
File.createNewFile()
method to create new file. This method returns a boolean value –true
if the file is created successfully.false
if the file already exists or the operation failed for some reason.
Please note that this method will only create a file, and does not write any content into the file.
Java example to create a new create file if not exist
To write the content into the created file, use
FileWriter
class. Noct 1 0.3. Create new file with FileOutputStream
FileOutputStream.write()
method automatically creates a new file and write content to it.Happy Learning !!
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- Written by Nam Ha Minh
- Last Updated on 28 July 2019 | Print Email
1. Reader, InputStreamReader, FileReader and BufferedReader
Reader is the abstract class for reading character streams. It implements the following fundamental methods:- read(): reads a single character.
- read(char[]): reads an array of characters.
- skip(long): skips some characters.
- close(): closes the stream.
2. Writer, OutputStreamWriter, FileWriter and BufferedWriter
Writer is the abstract class for writing character streams. It implements the following fundamental methods:- write(int): writes a single character.
- write(char[]): writes an array of characters.
- write(String): writes a string.
- close(): closes the stream.
3. Character Encoding and Charset
When constructing a reader or writer object, the default character encoding of the operating system is used (e.g. Cp1252 on Windows):So if we want to use a specific charset, use an InputStreamReader or OutputStreamWriter instead. For example:That creates a new reader with the Unicode character encoding UTF-16.And the following statement constructs a writer with the UTF-8 encoding:In case we want to use a BufferedReader, just wrap the InputStreamReader inside, for example:And for a BufferedWriter example:Now, let’s look at some complete examples.4. Java Reading from Text File Example
The following small program reads every single character from the file MyFile.txt and prints all the characters to the output console:The following example reads a text file with assumption that the encoding is UTF-16:And the following example uses a BufferedReader to read a text file line by line (this is the most efficient and preferred way):5. Java Writing to Text File Example
In the following example, a FileWriter is used to write two words “Hello World” and “Good Bye!” to a file named MyFile.txtPowershell Create New File With Text
:Note that, a writer uses default character encoding of the operating system by default. It also creates a new file if not exits, or overwrites the existing one. If you want to append text to an existing file, pass a boolean flag of true to constructor of the writer class:The following example uses a BufferedReader that wraps a FileReader to append text to an existing file:This is the preferred way to write to text file because the BufferedReader provides efficient way for writing character streams.And the following example specifies specific character encoding (UTF-16) when writing to the file:This program writes some Unicode string (Vietnamese) to the specified text file.NOTE: From Java 7, you can use try-with-resources statement to simplify the code of opening and closing the reader/writer. For example:References:
Java Create A File With Text
Related File IO Tutorials:
Other Java File IO Tutorials:
About the Author:
Nam Ha Minh is certified Java programmer (SCJP and SCWCD). He started programming with Java in the time of Java 1.4 and has been falling in love with Java since then. Make friend with him on Facebook and watch his Java videos you YouTube.[Java source code] | 4 kB |