Java by API/java.io/IOException

java.io.IOException

    
import java.io.IOException;
public class Main {
  public static void main(String[] args) {
    try {
      while (true) {
        int datum = System.in.read();
        if (datum == -1)
          break;
        System.out.println(datum);
      }
    } catch (IOException ex) {
      System.err.println("Couldn"t read from System.in!");
    }
  }
}