java creates 20000 txt

package makeDirectory;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;

import javax.imageio.IIOException;

public class Main {

	public static void main(String[] args) throws IOException {
		// TODO Auto-generated method stub
		String path="C:\\test\\";
		for(int i=1;i<20000;i++)
		{
			File f=new File(path+i+".txt");
			f.createNewFile();
			FileOutputStream fou=new FileOutputStream(f);
			OutputStreamWriter ou=new OutputStreamWriter(fou, "UTF-8");
			ou.write("中"+i);
			ou.flush();
			ou.close();
		}
		System.out.println("ok");
	}

}