Read From Text File In Java - SyntaxDB - Java Syntax Reference

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• • String Class
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Java

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Version: SE 8

Categories

• User Program Communication
  • Print
  • User Input
  • Commenting
  • Read from Text File
  • Write to File
  • Import Package
• Variables
  • Primitive Data Types
  • Type Casting
  • Variable Declaration
  • Constants
  • Arrays
  • HashMaps
  • HashSets
• Control Flow
  • If Statement
  • Switch Case
  • Ternary Operator
  • For Loop
  • For Each
  • While Loop
  • Do-While Loop
  • Try Catch Block
• Object Oriented Programming
  • Class Declaration
  • Access Modifiers
  • Constructor
  • Instantiation
  • Class Variables
  • Standard Methods
  • Class Methods
  • Inheritance
  • Interfaces
  • Abstract Methods and Classes
  • Anonymous Class
  • Declaring an Exception
  • Throwing an Exception
• String Class
  • String Variables
  • String Length
  • String Compare
  • String Trim
  • Split String
  • Substring
  • String Representation

User Program Communication

Read from Text File in Java

Used to read a text file.

Syntax

import java.io*; //create a FileReader object using the file name and path, the file reader reads the file by byte FileReader file = new FileReader(fileNamePath); //feed the FileReader into a BufferedReader to read line by line BufferedReader br = new BufferedReader(file); //read a line from the BufferedReader String fileLine = br.readLine(); file.close(); br.close();

Notes

Reader objects should always be closed to prevent a memory leak.

The BufferedReader reads a single line. On each additional call of the readLine() method, the BufferedReader advances to the next line of the file.

While a BufferedReader is most commonly used, other readers and scanners may be more suitable depending on the scenario. For example, when reading text files word by word, the Scanner class can be used.

This code should be wrapped in a try-catch block which checks for valid text format (IOException) and existence of the file (FileNotFoundException).

Example

import java.io*; try { FileReader file = new FileReader(names.txt); //feed the FileReader into a BufferedReader to read line by line BufferedReader br = new BufferedReader(file); String name = null; // //reads file until there are no more lines, using a null check while( (name = br.readLine()) ){ System.out.println("Name: " + name); } file.close(); br.close(); } catch (IOException e) { System.out.println("The file is not a valid format for the reader!"); } catch (FileNotFoundException f) { System.out.println("The file could not be found!"); }

See Also

Related

Try Catch Block

Documentation

Java Docs - BufferedReader Java Docs - FileReader

< Commenting | Write to File >