red kettle
I was JUST about to finish my code and it worked step by step but if i allow all stages to run congruently im met with this error after entering stage 2 and after it prints "enter name of the customer" Any ideas? Ive tried adding sc.nextLin(): after the string name = sc next line, ive also tried adding a system outprint with empty " "... im STUCK!
Also if i run JUST stage 2 it works, but not if i run it after stage 1
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red kettle
main method
Example of it breaking while all stages are active
oh and sorry heres the associated lines i didnt properly include in first screenshot
So its worked by removeing each and every sc.close(); up until the very last one? Can someone explain to me why because it showing up as warnings now that none of my stages are properly closed
calm badger
So its worked by removeing each and every sc.close(); up until the very last one...
you should create and work with only one instance of the Scanner (maybe you should make it as a static field, or pass it as an argument). Because when you close the scanner, it automatically also clothes System.in stream. So next Scanner object of System.in can't get any data because of closed stream
uncut auroraBOT
radiant bloom
also what alex said about using a single scanner
why are you using a Boolean there btw
red kettle
oh so cool i had no idea! i thought you had to initialise scanner for each method
im using bool cuz im doing a do while statement that breaks if returns false @radiant bloom
radiant bloom
no, why Boolean
why not boolean
boolean is a boolean
Boolean is a wrapper for a boolean
radiant bloom
it's in PascalCase, it's a class
radiant bloom
like char vs Character or int vs Integer
radiant bloom
ive had 6 months of python and like 4 months of java hahaha
ah yeah python is.... kinda a relatively bad direction to come in for the statically-typed OOP language java is lmao
python's OOP is a bodge, and relative to OOP in java, c#, js, etc, it's kinda fucked tbh
red kettle
yeah its like going from learning your colours to learning how to paint 😄
radiant bloom
why does it still work how i want it to tho i wonder
that's due to autoboxing/unboxing
radiant bloom
yeah its like going from learning your colours to learning how to paint 😄
eh not really
python to java is like learning with acrylic paints then going to watercolors
like, same thing, same idea
but you have to go about them very differently
red kettle
thats a nicer analogy 😄
radiant bloom
that's due to autoboxing/unboxing
red kettle
so perhaps would i put the scanner sc = new scanner (system .in) under the whole booking manager class?
that why it wraps all the methods
red kettle
hmm looks like it does need to be static
would that be something like
static void scanner(){
Scanner sc = new Scanner(system,in)}
nah it hates that too
😄
radiant bloom
there are 8 primitives in java
integers byte, short, int, long (= int in python)
floating-points float, double (= float in python)
character char (no equivalent in python)
boolean boolean (= bool in python)
note: int and float in python are arbitrary precision, they can expand to accomodate more data, java's types aren't like this. all of these have fixed sizes
primitives, conceptually, are just the raw data, with no way to process it
that's where the wrappers come in, Byte, Short, Integer, Long, Float, Double, Character, Boolean
they have methods to process the data, and they also integrate that data into OOP structure
radiant bloom
static void scanner(){
Scanner sc = new Scanner(system,in)}
void scanner() is a method, static void scanner() is a static method
there, the Scanner sc is just a local variable inside the method
you want to just have the plain Scanner sc, as a field, as a static field
red kettle
oh man
i think imma make a note to myself to learn this later lol its a bit too overwhelming right now 😄
thank you very much for you help though!!! @radiant bloom
uncut auroraBOT
thank you very much for you help though!!! <@628241756235890708>
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