learning java 读写其他进程的数据

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

public class ReadFromProcess {

    public static void main(String[] args) throws IOException {

        Process p = Runtime.getRuntime().exec("javac");

        var br = new BufferedReader(new InputStreamReader(p.getInputStream()));

        String buff = null;

        while ((buff = br.readLine()) != null) {

            System.out.println(buff);

        }

    }

}