在Java中如何在不关闭输入流的情况下读取它？

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class ReadInputStream {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));

        try {
            String line;
            while ((line = reader.readLine()) != null) {
                System.out.println("Read input: " + line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                reader.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}