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Java FileReader class is used to read data from the file. It returns data in byte format like FileInputStream class.

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It is character-oriented class which is used for file handling in java.

  • Note that the 64-bit version of Java does not, as of this writing, have an Auto Update feature. Don't confuse this with the 32-bit Java running on 64-bit computers as the 32-bit Java utilizes the Auto Update feature. Disable Adobe Reader Updates: 32-bit systems: REG.exe ADD 'HKLM SOFTWARE Adobe Adobe ARM 1.0 ARM' /v iCheckReader /t REGDWORD /d.
  • Java Reader Class for beginners and professionals with examples on Java IO or Input Output in Java with input stream, output stream, reader and writer class. The java.io package provides api to reading and writing data.
Java Reader For Macadvantageload

Java FileReader class declaration

Let's see the declaration for Java.io.FileReader class:

Constructors of FileReader class

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ConstructorDescription
FileReader(String file)It gets filename in string. It opens the given file in read mode. If file doesn't exist, it throws FileNotFoundException.
FileReader(File file)It gets filename in file instance. It opens the given file in read mode. If file doesn't exist, it throws FileNotFoundException.

Methods of FileReader class

MethodDescription
int read()It is used to return a character in ASCII form. It returns -1 at the end of file.
void close()It is used to close the FileReader class.

Java FileReader Example

In this example, we are reading the data from the text file testout.txt using Java FileReader class.

Here, we are assuming that you have following data in 'testout.txt' file:

Output:


To install Java on MacOS you need to go to the official Oracle download page and click on the major version of Java.

Press “JDK Download” link and scroll down and download macOS Installer.

When downloading is finished launch dmg file and double-click on the icon.

Java installer welcome page will be opened.

Press “Continue”.

Press “Install”.

So Java is successfully installed and ready to use.

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To check Java version you need:

  1. Open Launchpad
  2. Find and open Terminal
  3. Type java -version

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Output:

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