Read a File. In the previous chapter, you learned how to create and write to a file. In the following example, we use the Scanner class to read the contents of the text file we created in the previous chapter:

Jan 4, 2025 · There are several ways to read a plain text file in Java e.g. you can use FileReader, BufferedReader, or Scanner to read a text file. Every utility provides something special e.g. BufferedReader provides buffering of data for fast reading, and Scanner provides parsing ability.

Oct 19, 2014 · Scanner keyboard = new Scanner(System.in); // Get the filename. System.out.print("Enter the filename: "); String filename = keyboard.nextLine(); // Open the file. File file = new File(filename); Scanner inputFile = new Scanner(file); // Read lines from the file until no more are left.

Jan 8, 2024 · In this tutorial, we’ll explore different ways to read from a File in Java. First, we’ll learn how to load a file from the classpath, a URL, or from a JAR file using standard Java classes. Second, we’ll see how to read the content with BufferedReader , Scanner , StreamTokenizer , DataInputStream , SequenceInputStream, and FileChannel .

The most simple way to read data from a file in Java is making use of the File class to read the file and the Scanner class to read the content of the file.

Jan 6, 2024 · Any text editor, including Notepad in Windows and TextEdit in macOS, can read the text within a JAVA file. There are several ways to open a file with Java. Some of these methods include: Desktop class in Java; Java FileInputStream class; Java BufferedReader class; FileReader class in Java; Java Scanner class; Java nio package; Desktop Class in ...

Feb 8, 2023 · In this tutorial, we will learn how to open a file using both java.io.package and java.nio.package. There are six ways available to open or read a file in java. They are: 1. Desktop class. 2. Scanner class. 3. FileReader class. 4. FileInputStream class. 5. BufferedReader class. 6. Java nio package.

Jul 2, 2022 · My first Java method lets you read a text file as one String: * Opens and reads a file, and returns the contents as one String. */ BufferedReader reader = new BufferedReader(new FileReader(filename)); String line; StringBuilder sb = new StringBuilder(); while ((line = reader.readLine()) != null) sb.append(line + "\n"); reader.close();

Feb 11, 2025 · Both FileReader and BufferedReader are used to read data from a text file and display them. We will see how to open a file and then read text from it using simple Java methods. Be sure to be familiar with the Java while loop and for loop to appreciate the below examples fully.

Nov 23, 2023 · In this extensive tutorial, we explored various techniques for reading files in Java, ranging from basic text files to more complex CSV files. Understanding the classes and methods provided by Java’s I/O packages is essential for effective file processing.