问题描述
我当前正在运行 .class
文件作为进程。 .class
文件是一个简单的程序,要求用户输入数字,接受输入并将用户的输入打印回屏幕。
到目前为止,我已经设法通过 InputStream
从控制台上的进程中打印了输入数字:语句,并写入了用户输入的输入通过 OutputStream
。我无法在屏幕上打印最后的语句,应该是
I am currently running a .class
file as a process. The .class
file is a simple program that asks the user to input a number, takes the input and prints the user's input back to the screen.Up to now, i have managed to print the "Enter a number: " statement from the process on the console through InputStream
and write the input entered by the user through OutputStream
. I am unable to print the last statements on the screen, which should be
我的代码是:
String command [] = {"java" , "-cp", "C:\\Users\\Mahika\\Documents\\NetBeansProjects\\JavaTest\\compilerTest", "InputInteger"};
ProcessBuilder pb = new ProcessBuilder(command);
Process p = pb.start();
System.out.println("Process started");
BufferedReader br = new BufferedReader (new InputStreamReader(p.getInputStream()));
String output = null;
while((output = br.readLine()) != null){
System.out.println(output);
break;
}
Scanner sc = new Scanner(System.in);
int i = sc.nextInt();
OutputStream os = p.getOutputStream();
PrintStream ps = new PrintStream(os);
os.write(i);
os.flush();
我不知道如何使用 InputStream
再次阅读您输入的内容: +用户输入。
I don't know how to use InputStream
again to read the "You entered:" + userinput.
推荐答案
这应该有效:
public static void main(String[] args) throws IOException {
String command[] = {"java.exe", "-cp", "C:\\Users\\Mahika\\Documents\\NetBeansProjects\\JavaTest\\compilerTest", "InputInteger"};
ProcessBuilder pb = new ProcessBuilder(command);
Process p = pb.start();
System.out.println("Process started");
BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream()));
System.out.println(br.readLine());
Scanner sc = new Scanner(System.in);
int i = sc.nextInt();
PrintStream ps = new PrintStream(p.getOutputStream(), true);
ps.println(i);
System.out.println(br.readLine());
}
只需确保在 InputInteger中输入提示
类由换行符完成(例如,由 println
创建,而不是由 print
创建)。
Just make sure that input prompt in InputInteger
class is finished by a newline character (e.g. created by println
and not print
).
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