What are the commonly used input and output tools in Java function libraries?

Common input and output tools in Java function libraries include: File I/O: handles file reading and writing. Console I/O: Reading input from or outputting data to the console. Network I/O: Establishing network connections and communicating with other computers.

Common input and output tools in Java function library

The Java standard library provides many functions for processing input and output (I /O) tools, here are some of the most commonly used and useful tools:

File I/O

• java.io.File: Represents the file path
• java.io.FileInputStream: Read bytes from the file
• java.io.FileOutputStream: To Write bytes to the file
• java.io.FileReader: Read characters from the file
• java.io.FileWriter: Write to the file Writing characters in
• java.io.BufferedReader: A buffered character reader to improve performance
• java.io.BufferedWriter: A buffered character writer to improve performance

Console I/O

• System.in:Standard input stream, you can read data from the console
• System.out: Standard output stream, you can output data to the console
• System.err : Exception output stream, used to output error messages
• java.util.Scanner: A convenient and powerful input parser

Network I/O

• java.net.Socket: Establish network connections with applications on other computers
• java .net.ServerSocket: Listens for network connections from other computers
• java.net.URL: Represents a Uniform Resource Locator (URL) for a network resource
• java.net.URLConnection: Open the connection corresponding to the URL

Practical case: reading data from the file

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class FileInputExample {

    public static void main(String[] args) {
        try (BufferedReader br = new BufferedReader(new FileReader("data.txt"))) {
            String line;
            while ((line = br.readLine()) != null) {
                System.out.println(line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Practical case: writing data to a file

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;

public class FileOutputExample {

    public static void main(String[] args) {
        try (BufferedWriter bw = new BufferedWriter(new FileWriter("output.txt"))) {
            bw.write("Hello world!");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

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