System.setErr(PrintStream err)

    
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.sql.Timestamp;

public class MainClass {

  public static void main(String[] args) {

    try {
      String FILE = "c:\\systemin.txt";
      FileOutputStream outStr = new FileOutputStream(FILE, true);
      PrintStream printStream = new PrintStream(outStr);

      System.setErr(printStream);

      Timestamp now = new Timestamp(System.currentTimeMillis());
      System.out.println(now.toString() + ": This is text that should go to the file");

      outStr.close();
      printStream.close();
    } catch (FileNotFoundException ex) {
      ex.printStackTrace();
      System.exit(-1);
    } catch (IOException ex) {
      ex.printStackTrace();
      System.exit(-1);
    }
  }
}

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System.setErr(PrintStream err) : System « java.lang « Java by API

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