protected void appendIdentityHashCode(StringBuffer buffer, Object object) {
        if (this.isUseIdentityHashCode() && object!=null) {
            register(object);
            buffer.append('@');
            buffer.append(Integer.toHexString(System.identityHashCode(object)));
        }
    }
<p>Append the {@link System#identityHashCode(Object)}.</p>

@param buffer  the <code>StringBuffer</code> to populate
@param object  the <code>Object</code> whose id to output
android/android_framework/base/src/main/java/lang3/builder/ToStringStyle.java