How Does System.in Work for Input Handling in Java?

Question

Khushi Singh · Answer

System.in acts as the standard input stream within Java to receive input data from consoles and external sources. The
input stream inherits from InputStream, meaning it reads unprocessed binary data; therefore, it needs additional processing to interpret bytes into characters. Java, as a character-based system, utilizes
System.in with the help of Scanner or BufferedReader, or
InputStreamReader for improved input handling.
System.in operates through byte streams by default, so it performs inefficiently when used for reading text strings directly. A program can transform byte data into readable characters through the use of
InputStreamReader, which provides a data pipeline between System.in and advanced text-based input processing mechanisms. By integrating
BufferedReader with InputStreamReader, users achieve better reading performance because there will be fewer read operations required.
The combination of Scanner with System.in serves modern 
Java applications for easy input parsing of integers and doubles, and strings.and 
For example:
import java.util.Scanner;
public class SystemInExample {
   public static void main(String[] args) {
       Scanner scanner = new Scanner(System.in);
       System.out.print("Enter your age: ");
       int age = scanner.nextInt();
       System.out.println("Your age is: " + age);
       scanner.close();
   }
}
The application first obtains input data from the System.in through the
Scanner class to transform it into an integer with
nextInt(). The presence of System.in produces valuable benefits when used for real-time user interface operations. An alternative method for handling large input data involves using
BufferedReader and InputStreamReader together.

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How Does System.in Work for Input Handling in Java?

Ashutosh Kumar Verma

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