This is the best Java tutorial for beginners, so you can learn Java and English in one hit. Please keep going! I vote for Java advance tutorial. Thanks a lot Bro
Can someone explain why we used (Car x) as an argument of the copy method? What does this x mean? Is it a placeholder for whatever name we're gonna give to the object? Which object does it refer to?
X is the object of type Car that you'll be copying the attributes from. (This)aka car 2 is doing the calling, so u place the attributes from X onto car 2. A copy constructor basically a method that copies the attributes of an object onto another object of the same type. X in this case is Car1.
Instances of classes, wether it's either predefined classes in java like String or classes created by programmers, all of them are stored in memory(RAM), this is called data by reference. In the tutorial, copying objects means to do an object point at the same memory space by the reference. Pay attention when the teacher equalize car2=car2 and print both object return the same memory address. I expect that you understand me, I'm not native spiker and have a low level of English.
Hello, this video really helped me, but I have a question. Can I accses the values of Car x in the copy method directly like this since the method is in the Car class: public void copy(Car x) { this.setMake(x.make); this.setModel(x.model); this.setYear(x.year); } it worked for me, but i am rather asking. btw I watched almost the entire java playlist (most of it in the 12h. video) and I love the way you're doing it, it's amazing. (sorry for my English)
You can do that and it will work fine if it is set up in the same way. However, it is best practice to make member variables private and use public/protected getters and setters for them. The reason being is let's say you don't want specific things to be set as the value stored in the variable, you can stop this by handling this in your setter however you would like. Then, the only way you can retrieve that variable is by using the defined getter method (since the member variable has private access). If you're calling the variables from within the class itself, it isn't required that you use a getter and setter (since private access doesn't matter within the same class), but, again, it is best practice to make getters and setters to handle how code is accessed and updated. Hope this helps!
