File Handling 2 - Reading data from a file

Summary

Key Points

• —The video explains how to read content from a file in Java, building on a previous example of writing to files. 0:12
• —All file reading operations are placed within a `try` block to catch potential `FileNotFoundException` if the file is not found. 1:11
• —Key Java classes for file reading include `java.io.File` for connecting to the file, `java.io.FileNotFoundException` for error handling, and `java.util.Scanner` for reading the file's content. 1:47
• —A `File` object is instantiated with the file path to establish a connection to the file for reading. 2:23
• —It is important to close the `Scanner` instance using `reader.close()` after all content has been read to release system resources. 2:34
• —A `Scanner` instance is created, initialized with the `File` object, to act as a reader for the file's content. 2:49
• —A `while` loop, using `reader.hasNextLine()`, iteratively checks if there are more lines to read in the file. 3:09
• —Inside the loop, `reader.nextLine()` reads each complete line of text, which can then be stored in a string variable and processed, such as by printing it. 4:24
• —For lines containing multiple values separated by delimiters like commas, the video suggests tokenizing the line to extract individual values. 5:10
• —The `catch` block is crucial for handling `FileNotFoundException` gracefully if the specified file does not exist. 7:50