Java: why can I not add values to my Object[ ]?

Hello Experts,

Why can I not add values to my Obj [ ] ?

public static void main(String args[]) {

	Pattern p = Pattern.compile("Sip\\w*");

	String file = "message SipRoute test in SipUser " + "\n"
		+ "receipt SipCall at time SipUpdate " + "\n"
		+ "message SipReg during SipDiv " + "\n";

	ArrayList<String> list = new ArrayList<String>();
	Object obj[] = null;

    	Matcher matcher = p.matcher(file);
    	while(matcher.find() == true){
    		list.add(matcher.group());
		obj = new Object[]{matcher.group()};
	}

    	//prints arraylist ok
	for (int x = 0; x < list.size(); x++) {
		System.out.println("myArray: " + list.get(x));
	}

	//fails to add to Obj array - why?
	for (int x = 0; x < obj.length; x++) {
		System.out.println("obj: " + obj[x]);
	}
			
  }

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In advance, thank you for your help...

Regards,