Remove untrue tip about zero-length arrays.

in any Activity where you read and write the file, you need an object to use as the intrinsic

in any Activity where you read and write the file, you need an object to use as the intrinsic

lock for the synchronized statements:</p>

lock for the synchronized statements:</p>

<div class="sidebox-wrapper">

<div class="sidebox">

<p><strong>Interesting Fact:</strong></p>

<p>A zero-length array is lighter-weight than a normal Object, so it's great for an

intrinsic lock.</p>

</div>

</div>

<pre>

<pre>

// Object for intrinsic lock

// Object for intrinsic lock

static final Object[] sDataLock = new Object[0];

static final Object[] sDataLock = new Object[0];