使C fork代码适应Java程序

在Java中，可能看起来像-

public static void main(String[] args) {    try {        Process p = Runtime.getRuntime().exec("/bin/ls");        final InputStream is = p.getInputStream();        Thread t = new Thread(new Runnable() { public void run() {     InputStreamReader isr = new InputStreamReader(is);     int ch;     try {         while ((ch = isr.read()) != -1) {  System.out.print((char) ch);         }     } catch (IOException e) {         e.printStackTrace();     } }        });        t.start();        p.waitFor();        t.join();        System.out.println("Child Complete");    } catch (Exception e) {        e.printStackTrace();    }}