Web Reference: Mar 13, 2026 · In Java, file handling means working with files like creating them, reading data, writing data or deleting them. It helps a program save and use information permanently on the computer. There are a wide array of file I/O methods to choose from. To help make sense of the API, the following diagram arranges the file I/O methods by complexity. On the far left of the diagram are the utility methods readAllBytes, readAllLines, and the write methods, designed for simple, common cases. In the previous chapters, 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:
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