Java variable scope 🌍

Java variable scope
#Java #variable #scope
//**********************************************
public class Main {
public static void main(String[] args) {
//local = declared inside a method
// visible only to that method
//global = declared outside a method, but within a class
// visible to all parts of a class
DiceRoller diceRoller = new DiceRoller();
}
}
//**********************************************
import java.util.Random;
public class DiceRoller {
Random random;
int number;
DiceRoller(){
random = new Random();
roll();
}
void roll() {
number = random.nextInt(6)+1;
System.out.println(number);
}
}
//**********************************************

[@BroCodez]

//********************************************** public class Main { public static void main(String[] args) { //local = declared inside a method // visible only to that method //global = declared outside a method, but within a class // visible to all parts of a class DiceRoller diceRoller = new DiceRoller(); } } //********************************************** import java.util.Random; public class DiceRoller { Random random; int number; DiceRoller(){ random = new Random(); roll(); } void roll() { number = random.nextInt(6)+1; System.out.println(number); } } //**********************************************

[@IshmaelDoe]

hi bro, may I know why you created a constructor that didn't instantiated any value? Is it for the purpose for easy demonstration? In standard practice should we do something like this, and if so what do we us it for? Thank!

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[@T0ra99]

Interesting, at our University's CS program, variable scope is one of the major content for our first 2 intro courses.

[@vocodeex]

how is it possible that a university software engineering couse does not teach variable scope

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[@vocodeex]

@@z1nai i can do that too but variable scope is important for programming. Its interesting.

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[@formlessavatar5220]

Thanks so much bro. Just wondering if there's actually any difference between the 2 approaches shown (declaring locally and passing as arguments to a method vs. creating global variables that can be accessed anywhere), in terms of memory use and/or any other practical considerations? Are there certain common situations/use-cases I could run into that may warrant using one way over the other, or do we just decide based on individual applications each time? Cheers, much love

[@EaglesOps24]

IF anyone is confused why he did not assign number in the DiceRoller constructor to 0 its because in java when you intitialize an int it is automatically assigned 0.

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[@mayankgupta9277]

Java like other language such as C and C++ doesn't have the concept of Local and Global variables as Java is a strictly Object Oriented Language. There are 2 scope defined by Java, one defined by the class and another defined inside the method. P.S - I am not pointing out, I have learnt a great deal from you and love all your videos.

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well explained,thank you for sharing

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[@joshbenjamin1100]

How can I now use the result of the dice roll? I created a SecondDiceRoller class that extends DiceRoller and only use that object in the Main class (i.e., SecondDiceRoller diceRoller2 = new SecondDiceRoller(); ), giving back two numbers. But what if I want to add those numbers together and use that result to compare against subsequent rolls (if you haven't guessed, I'm trying to make a craps game!).

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I understand the point about the global and local variables, but I need to rewatch the video to gatch the idea of your program. I am not a native speaker like you LOL😜.

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[@nikitassouvatzis1928]

Ένα ακόμα σημαντικό θέμα για την εκμάθηση της γλώσσας Java, είναι η εμβέλεια (scope) των μεταβλητών (variables).

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Still a confusing topic to me but what ever

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almost forgot thank you

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lets defeat the algorithm

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[@NileshYadav-rg8bf]

I am getting an error that symbol not found on the code: DiceRoller diceRoller = new DiceRoller(); Help me out.

[@abisarwan20]

u have to create new fille as class with name DiceRoller

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it is already in the video's decription

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