protected void setArrayStart(String arrayStart) {
        if (arrayStart == null) {
            arrayStart = "";
        }
        this.arrayStart = arrayStart;
    }
<p>Sets the array start text.</p>

<p><code>null</code> is accepted, but will be converted to
an empty String.</p>

@param arrayStart  the new array start text
android/android_framework/base/src/main/java/lang3/builder/ToStringStyle.java