android SharedPreferences 的问题，读不到数据。

		SharedPreferences share = getSharedPreferences("name", 0);

		Editor e = share.edit();

		

		//方法a，在第一句输出的时候读不到数据。

		String a = "abc_cc";

		System.err.println(share.getString(a, "默认结果"));//此句似乎没有执行，没有任何输出，错误...

															//但是第二次执行的时候，会正常输出。

		e.putString(a, "修改的结果");

		e.commit();

		System.err.println(share.getString(a, "默认结果"));//输出：修改的结果，正常

		

		//方法b，一切正常

		System.err.println(share.getString("abc_cc", "默认结果"));//输出：默认结果，正常

		e.putString("abc_cc", "修改的结果");

		e.commit();

		System.err.println(share.getString("abc_cc", "默认结果"));//输出：修改的结果，正常

		

		//求解，为什么方法a不行？

    String getString(String key, String defValue);

    

    /**

     * Retrieve a set of String values from the preferences.

     * 

     * <p>Note that you <em>must not</em> modify the set instance returned

     * by this call.  The consistency of the stored data is not guaranteed

     * if you do, nor is your ability to modify the instance at all.

     *

     * @param key The name of the preference to retrieve.

     * @param defValues Values to return if this preference does not exist.

     * 

     * @return Returns the preference values if they exist, or defValues.

     * Throws ClassCastException if there is a preference with this name

     * that is not a Set.

     * 

     * @throws ClassCastException

     */