process.waitFor()的问题

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import java.util.ArrayList;
import java.util.Scanner;

public class WatchThread extends Thread {
    Process p; 
    boolean over; 
    ArrayList<String> stream; 
    public WatchThread(Process p){ 
	this.p = p; 
	over = false; 
	stream = new ArrayList<String>(); 
    } 
    public void run() { 
	try { 
	    if(p == null)return; 
	    Scanner br = new Scanner(p.getInputStream()); 
	    while (true) { 
		if (p==null || over) break; 
		while(br.hasNextLine()){ 
		    String tempStream = br.nextLine(); 
		    if(tempStream.trim()==null||tempStream.trim().equals(""))continue; 
		    stream.add(tempStream); 
		} 
	    } 
	    } catch(Exception e){
		e.printStackTrace();
	    } 
    } 
    
    public void setOver(boolean over) { 
	this.over = over; 
    } 
    public ArrayList<String> getStream() { 
	return stream; 
    } 
} 

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WatchThread wt = new WatchThread(process); 
wt.start(); 

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ArrayList<String> commandStream = wt.getStream(); 
wt.setOver(true);