Magento version: 2.0.0

In ther Magento\Checkout\Block\Cart, there has a function is:

 * @codeCoverageIgnore
 * @return int
public function getItemsCount()
    return $this->getQuote()->getItemsCount();

getQuote() is from the Class AbstractCart because Cart is extends \Magento\Checkout\Block\Cart\AbstractCart.

According the Eclipse helping, getItemsCount() should be from Magento\Quote\Model\Quote.

In \Magento\Checkout\Block\Cart\AbstractCart, the Class Quote is just only invoked with use keywords but not initialize or extend.

So, I am confused the relationship of getQuote() with getItemsCount(). getQuote() is not extend from Quote class, why it can use the getItemsCount() of Quote?


Here's the code from vendor/magento/module-checkout/Block/Cart/AbstractCart.php:

public function getQuote()
    if (null === $this->_quote) {
        $this->_quote = $this->_checkoutSession->getQuote();
    return $this->_quote;

$this->_$quote is an object of Magento/Quote/Model/Quote class. Thus, the relationship is quite certain.

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