Reading a File
When you need to process data stored in a text file, reading the file line by line is one of the most common and efficient approaches. In Java, this is typically accomplished using the FileReader and BufferedReader classes. FileReader provides a way to read the contents of a file as a stream of characters, while BufferedReader wraps around FileReader to add buffering and convenient methods like readLine(). Reading line by line is particularly useful when dealing with large files, as it allows you to process each line individually without loading the entire file into memory. This approach is both memory efficient and helps you handle files of any size safely.
123456789101112131415161718192021import java.io.FileReader; import java.io.BufferedReader; import java.io.IOException; public class ReadFileExample { public static void main(String[] args) { try { FileReader fileReader = new FileReader("example.txt"); BufferedReader bufferedReader = new BufferedReader(fileReader); String line; while ((line = bufferedReader.readLine()) != null) { System.out.println(line); } bufferedReader.close(); } catch (IOException e) { e.printStackTrace(); } } }
Efficient and safe file reading is crucial in Java programs. By reading files line by line with BufferedReader, you minimize memory usage and reduce the risk of running into errors with large files. Always remember to close your resources after use to prevent resource leaks and maintain good application performance.
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When you need to process data stored in a text file, reading the file line by line is one of the most common and efficient approaches. In Java, this is typically accomplished using the FileReader and BufferedReader classes. FileReader provides a way to read the contents of a file as a stream of characters, while BufferedReader wraps around FileReader to add buffering and convenient methods like readLine(). Reading line by line is particularly useful when dealing with large files, as it allows you to process each line individually without loading the entire file into memory. This approach is both memory efficient and helps you handle files of any size safely.
123456789101112131415161718192021import java.io.FileReader; import java.io.BufferedReader; import java.io.IOException; public class ReadFileExample { public static void main(String[] args) { try { FileReader fileReader = new FileReader("example.txt"); BufferedReader bufferedReader = new BufferedReader(fileReader); String line; while ((line = bufferedReader.readLine()) != null) { System.out.println(line); } bufferedReader.close(); } catch (IOException e) { e.printStackTrace(); } } }
Efficient and safe file reading is crucial in Java programs. By reading files line by line with BufferedReader, you minimize memory usage and reduce the risk of running into errors with large files. Always remember to close your resources after use to prevent resource leaks and maintain good application performance.
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