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How the 'in' field represents the standard input stream?

You can use it to accept user keyboard input.

import java.io.IOException;

public class MainClass {

public static void main(String[] args) {

try {
  char c = (char) System.in.read();
  while (c != '\r') {
    System.out.println(c);
    c = (char) System.in.read();
  }
} catch (IOException e) {
}

}

}