×

Loading...
Ad by
  • 最优利率和cashback可以申请特批，好信用好收入offer更好。请点链接扫码加微信咨询，Scotiabank -- Nick Zhang 6478812600。
Ad by
  • 最优利率和cashback可以申请特批，好信用好收入offer更好。请点链接扫码加微信咨询，Scotiabank -- Nick Zhang 6478812600。

@Montreal

Jabber's toy code--001---Start an external process from within Java virtual machine

jabber(jabber)
Let me say that we want to launch NotePad from with JVM. Here is the toy code:

public class NotepadLauncher{
public static void main(String args[]) throws Exception{
Runtime rt = Runtime.getRuntime();
Process p=rt.exec("notepad.exe");
p.waitFor();
}
}

Here are some questions: 1) Can we designate Notepad to open a specific file, say, abc.txt? 2) What is the effect of "p.waitFor()" ? 3) Do we need set PATH for notepad at windows machine? Is this a good example to teach people the significane of PATH in the programming? Many people have done several year's programming but they still have no sense of the environmental variable "PATH".
(#107319@0)
Last Updated: 2001-6-20
Sign in and Reply Report

Replies, comments and Discussions:

  • 工作学习 / IT技术讨论 / Jabber's toy code--001---Start an external process from within Java virtual machine -jabber(jabber); 2001-6-20 {699} (#107319@0)
    Let me say that we want to launch NotePad from with JVM. Here is the toy code:

    public class NotepadLauncher{
    public static void main(String args[]) throws Exception{
    Runtime rt = Runtime.getRuntime();
    Process p=rt.exec("notepad.exe");
    p.waitFor();
    }
    }

    Here are some questions: 1) Can we designate Notepad to open a specific file, say, abc.txt? 2) What is the effect of "p.waitFor()" ? 3) Do we need set PATH for notepad at windows machine? Is this a good example to teach people the significane of PATH in the programming? Many people have done several year's programming but they still have no sense of the environmental variable "PATH".
    • Let me try: 1. yes "notepad.exe abc.txt". 2. wait until the notepad app closed. 3. yes. -eglington(_); 2001-6-20 (#107328@0)
    • I have tried -hailstorm(鹏飞北溟); 2001-6-20 {731} (#107335@0)
      Good example.
      I just tried this small assisment. Hope I can learn more from you.
      1. I did like this

      public static void main(String args[]) throws Exception{
      Runtime rt = Runtime.getRuntime();
      Process p=rt.exec("notepad.exe c:\\users\\file\\java\\abc.txt");
      p.waitFor();
      }

      2. the waitFor will cause the current thread to wait, if necessary, until the process represented by this Process object has terminated. So the program will pause until you finished with notepad

      3. no need to set path for notepad in Windows. It's under the default Window directory.

      Question: If I am running another program, say "catchme.exe", I should either add the path to exec or put the path in PATH variable, right?
    • Both egg and hailstorm got 100 scores. Because having gone through tough tests, Canadian programmers are more skillful than their American counterparts. -jabber(jabber); 2001-6-21 (#108080@0)

More Topics

  • Torvalds patch improves Linux performance by 2.6%
  • GitHub Spark
  • 脑洞大开，突发奇想，用力来传播信息
  • 看大家讨论日语，俺也正在认真学习。其实语言问题应该是很快也很容易就解决的，可能比自动驾驶来的还快。TREK里面，全宇宙的人都在大脑里安装了UNIVERSAL TRANSLATOR，外星人之间相互交流无障碍。废话少说，看视频。。。加上个MIC和耳机，不同国家的人就可以无障碍交流。
  • 肉脸真有搞 IT 的？Linux 把俄国中国伊朗踢出去了好像肉脸 IT 没啥感觉似的
    • 枫下论坛主坛 /  工作学习 /  IT技术讨论