Redirect the output of System.out to a file. : System Class « Development « Java Tutorial

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2. Development
3. System Class

import java.io.File;
import java.io.IOException;
import java.io.PrintStream;

public class MainClass {
  public static void main(String[] args) {
    File file = new File("C:\\temp\\debug.txt");
    try {
      PrintStream ps = new PrintStream(file);
      System.setOut(ps);
    } catch (IOException e) {
    }
    System.out.println("To File");
  }
}