@Override
    public String toString() {
        if (this.getObject() == null) {
            this.getStringBuffer().append(this.getStyle().getNullText());
        } else {
            style.appendEnd(this.getStringBuffer(), this.getObject());
        }
        return this.getStringBuffer().toString();
    }
<p>Returns the built <code>toString</code>.</p>

<p>This method appends the end of data indicator, and can only be called once.
Use {@link #getStringBuffer} to get the current string state.</p>

<p>If the object is <code>null</code>, return the style's <code>nullText</code></p>

@return the String <code>toString</code>
android/android_framework/base/src/main/java/lang3/builder/ToStringBuilder.java