Car car = new Car(22000,"silver"); WeakReference<Car> weakCar = new WeakReference<Car>(car); car = null; System.gc(); when the above code is gc, weakCar.get () returns null, indicating that the Car object has been recycled, but th...
1. Question 2. Code Node* BST :: deletemin(Node*& r){ if(r == NULL){ return NULL; } if(r->lc == NULL){ if(r->rc != NULL){ if(r->father != NULL){ r->rc->father = r->fath...
how do they compare their advantages and disadvantages? I feel that ConcurrentHashMap will have higher performance, after all, the built-in ...
first of all, the page uses the vue framework, then the pull-up loads more, and the drop-down refresh function uses the plug-in swiper. One of the problems encountered now is that when the list of items on the page is edited and deleted, if it is pulled...
Question 1 function bar(){ .... } in chrome environment: console.log(this.bar) bar console.log(window.bar) bar so you can think of bar as bound to window. < hr > so: in node environment: console.log(this.bar) undefined console.log(glob...
which orm framework is better for node + koa + mysql. I hope you can let me know if you have used it. Thank you very much ....