Understanding Java Composition Part 1

Java Composition Part 1- From my Complete Java Developer course.

[muhammedwafa]

the fun thing is i am taking your course on Udemy and i did not understand it there, then i said maybe i can find anything on youtube that can help, then i found you lol .. the same video that i did not understand earlier.

[FontySchriek]

This is an excellent example of Aggregation, not of Composition! In Composition the PC is the owner of its parts (motherboard, case, monitor) to enforce life-long dependency, so the motherboard, case and monitor objects should never exist as stand alone objects outside of the PC object, since this would mean you still would have a reference to them, even if you would mark the PC object for deletion (by setting: thePC = null;)

[bern]

You monster. You took one of the greatest IDE's in the world and you put it on light theme! I could hardly recognize it! Great tutorial though.

[kwabenaampofo]

seen other videos on the topic, this has been the best so far. thanks for making this

[SamuelNKiap]

I enjoyed the tutorial as Aggregation. Composition should have code to create contained object inside the constructor.

[karthiknatarajan]

but it is aggregation not composition because lifetime of monitor case is not dependent of pc object

[inayatullah]

I'm a taking course of yours on udemy and its fantastic.

[weetyytasdsa]

do you make sure this is Composition ? if it compostion why dont you try add line pc = null and see whether or not Case, Monitor and Motherboard already delete ?

[bilalrana]

Great example to explain Composition Thanks Tim !!

[Frazful]

Best video on composition I came across. Subbed, thank you sir!

[amirsmair]

finally i understand this concept .. thanks so much <3

[ckbapps]

I have owned the full course... Very depth course..

I have one problem. In Monitor class, in getter method

public String getNativeResolution() {
return nativeResolution;
}

It is showing me an error - Incompatible types:
Required: Java.lang.String
Found: com.Composition.Resolution

I am also using same IDE.... Please help

[yamaraahi]

.Thank You .You just described a great example greatly
but for suggestion, I think it might be better to make it simpler ... I mean do not going too much on details would be better

[facundocolino]

There is something that I can't undestand. For instance if the PC object is composed by a Case object, I think that you should have a new Case() sentence inside the PC constructor. The way you implemented it, creating the Case object in the main and passing the reference to the set method, looks more like aggregation than composition to me.

[avi_mukesh]

Thank you so much for this video! Very nicely explained. However, I have one question: where you called the drawPixelAt() method like thePC.getMonitor().drawPixelAt(x, y, ""), this does the same thing as theMonitor.drawPixelAt(x, y, ""). Why is the previous way better? Is it simply so you only have to remember the name of the PC object?

[jdfdoyley]

Great tutorial Tim, however, I wanted to know what your reason for using only "getters" as oppose to using both "getters and setters"?

[ef]

Lately i've been hearing Composition > Inheritance, but i've been having trouble understanding how to build structures so that they avoid inheritance. Can someone give an example of how the vehicle class could be set up as composition instead of inheritance.

[niklasmenard]

A few very interesting points made in this video and I like that the computer example is easy to visualize. Maybe next time use less time creating classes and more focus on the subject at hand (what is composition). This is my personal opinion though.

[RamaKrishna-xpju]

Great Video .. Can I know any videos on jsp

[prakashale]

Brilliant tutorial that I have ever watched ! By the way, I got a question, which platform you are using for code, I don't think it is eclipse :)