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The java.io package in Java provides a set of input and output streams used to read and write data to files or other input/output sources. It's a part of Java's standard library and includes classes like FileInputStream, FileOutputStream, BufferedReader, BufferedWriter, and many others1.
Example: Reading from a File
import java.io.FileInputStream;import java.io.IOException;import java.io.InputStream;public class ReadExample {public static void main(String[] args) {try (InputStream is = new FileInputStream("example.txt")) {int byteRead;while ((byteRead = is.read()) != -1) {// Process the bytechar character = (char) byteRead;System.out.print(character);}} catch (IOException e) {e.printStackTrace();}}}Example: Writing to a File
import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStream;public class WriteExample {public static void main(String[] args) {try (OutputStream os = new FileOutputStream("example.txt")) {String data = "Hello, World!";os.write(data.getBytes()); What is the purpose of * in java.io.* - Stack Overflow
WEBJan 13, 2014 · The * tells the compiler to import all top-level classes in java.io on demand. The construct is called a type-import-on-demand declaration. From JLS §7.5.2: A type-import-on-demand declaration allows all accessible types of a named package or type to …
Eclipse: "The import java.io cannot be resolved" - Stack Overflow
WEBMar 14, 2013 · Check your Eclipse preferences: Java -> Installed JREs. The one that you're using should be marked and it should be a JDK not just a JRE. Project build path. Also …
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