a demo to read error by using java

Main.java

import java.io.InputStream;
public class Main{
	public static void main(String[] args){
		try{
			new ProcessBuilder("gcc", "-o", "test.out", "test.c").start();
			ProcessBuilder process_builder = new ProcessBuilder("./test.out", "");
			Process run_process;
			run_process = process_builder.start();
			InputStream subprocess_error = run_process.getErrorStream();
			byte[] a = subprocess_error.readAllBytes();
			System.out.print(new String(a));
			//			for (int i = 0; i < subprocess_error.available(); i++){
//				System.out.print("" + subprocess_error.read());
//			}
		}catch(Exception e){
			System.out.println("something is wrong");
		}
	}
}

test.c

#include<stdio.h>
#include<unistd.h>
int main()
{
	write(1,"111111111---stdout", 18);
	write(2,"222222222---stderr", 18);
	return 0;
}