Very simple Java questions

[zinc nova]

so

im bascially in my first week of using java and i need help with thesse questions

you can see i started out trying to do the part a

but idk where to go from there

[gusty flower]

can you post what you have so far so that we can help you?

[zinc nova]

wdym

this is what i have so far

@gusty flower

[gusty flower]

are you able to use the substring method?

[zinc nova]

i have like

no idea what im doing

i have these

teacher gave them to me

i kinda see what i need to do but i dont know how

[gusty flower]

tell me in english what you think you need to do and maybe it will help you actually write the code

[zinc nova]

before i do that

my treacher said that in these 2 questions im not writing a whole class just code segments

what does that mean for me

[gusty flower]

do you know what a class is in java?

[zinc nova]

sorry if i like sound like a dickhea dbtw im like doing a bunch of shit ayt once for like 6 classes and going crazy mentally

kinda

[gusty flower]

it's np

[zinc nova]

like

isnt there

a class and then like

u use the class

the class is how u make like objects

and objects let u do shit and store values and methods and stuff

[gusty flower]

so you don't need to make all of that just a working function

in java you need to write out a lot to get stuff done but in other languages you can get more to the point if you want to call it that

and for the question you can just get right to the point

[zinc nova]

okay

this is gonna sound stupid but why do i get to get right to the point

just bc my teacher is letting me?

like wouldnt i need to have a class that defines methods to use in this function thing

[gusty flower]

for you to write it on the computer you would need to have a class

but I guess since it's just a question on a paper it's not necessary

[zinc nova]

alright

so

back to the whole

explainuing what id have to do in english thing

i believe id have to

first check if the string is an even number

then divide it by 2

hold on

[gusty flower]

its stated it's event

[zinc nova]

id divide it by 2 but first id need to get the length

[gusty flower]

even

[zinc nova]

okay

then id just get its length

name.Length()

then like

divide it and store the divided variable in an int variable

and then use the like

name.substring(divided number int variable, number length)

and store it in a variable

[gusty flower]

what will that give you

what does that represent to you?

[zinc nova]

wdym

[gusty flower]

or what would you call the variable?

[zinc nova]

sum like

[gusty flower]

sum?

[zinc nova]

no like

[gusty flower]

like the addition of 2 numbers?

[zinc nova]

something like uhh

no

sum as in something

abbreviated lol

i guess like

well which variable

the one that would be storing the length

the one that stores the divided length

or the final substring thing

[gusty flower]

name.substring(divided number int variable, number length)

[zinc nova]

secondHalfStr

idk

[gusty flower]

ok thats fine

[zinc nova]

and lastly id save the str value as like

secondHalfStr and then the firstHalfStr which would be defined as the same method but instead of the substring being the number length it wo uld be 0

b/c first index thing

to the half

[gusty flower]

what would be the second argument to the substring function?

[zinc nova]

i hope u understand my lucridous thoughts btw

wait wdym by second arghument

[gusty flower]

name.substring(divided number int variable, number length)

there is 2 arguments here

there is a , in between them

[zinc nova]

it would be 0? like the start of the str

[gusty flower]

thats one argument

whats the other one?

maybe just write out what the name.substring() would look like

[zinc nova]

name.substring(numberLength, 0)

[gusty flower]

the start of the substring would be the length index and the end would be 0?

[zinc nova]

ohh i see what ur getting to

other way around right

so 0, numberLength

[gusty flower]

numberLength is name.Length()?

[zinc nova]

no numberLength would be divided number int variable thing

[gusty flower]

oh ok

[zinc nova]

so if the entire string length is 10

it would be 5

0,5

and 5 would be stored in it

[gusty flower]

oh ok

[zinc nova]

how would i begin to write this all out?

[gusty flower]

well lets write down what we got

first the number length

then write down the first half

then write down the second half

and then we should have the parts that we need to answer the question

[zinc nova]

do ineed any of the like

public class

private whatever

no because im not writing a whoel class right

[gusty flower]

no for class for for the method maybe

[zinc nova]

wdym for the method?

[gusty flower]

the function

but maybe you don't even need that

I'm not sure if you need it or not

public class Main {
static void myMethod() {
// code to be executed
}
}

it's normally setup like this

the modifiers change depending on what you are trying to make

and you might need the static void methodName {}

I'm not sure if u do or not

the code generally goes inside of that

it doesn't hurt to add it

[zinc nova]

would it be somethign like this

and then i add the like

public class Main

[gusty flower]

you don't need the class part

the question says you don't

[zinc nova]

ok so i shouldnt

what should i put here

and like

idk i just feel like what i wrote isnt fully correct

isnt it missing something

[gusty flower]

well you need to concatenate the final strings parts

and is str a data type?

[zinc nova]

like

str = string

kinda like int stores an integer value or wh atevr

right

isnt that how that works

[gusty flower]

for int yeah

[zinc nova]

and how would i concatenate the final part

[gusty flower]

for string I don't think so

[zinc nova]

wait

is string just string

[gusty flower]

very close

but you need to make one change for it to work

[zinc nova]

String

[gusty flower]

there you go

[zinc nova]

ok awesome

then the concatenation thing

[gusty flower]

now how do you combine two strings

[zinc nova]

"string1" + "string2"?

[gusty flower]

yeah

[zinc nova]

but its a string stored in a variable

so i wouldnt use "

id just put like

secondHalfStr + firstHalfStr

?

[gusty flower]

there you go

[zinc nova]

shoul di keep the string str = nm,ae thing

i put that randomly

[gusty flower]

there is a problem with how you wrote the definition of lengthStr

you had it correct earlier

but now it's not written correctly

something wrong with the right side of the equals

[zinc nova]

()

[gusty flower]

yeah

[gusty flower]

oh

it's still wrong though

it's not capital

[zinc nova]

capit

eya

ok

done

[gusty flower]

ok lets see it

[zinc nova]

do i keep the string str = name thing

[gusty flower]

yeah you would need the name

[zinc nova]

do i bneed the str part tho

like how does it even work

the string str = name pa rt

i just wrote it down nota ctually thinking abt how it does anything

[gusty flower]

well technically not

cause they would give it to you

but if ur writing it for a question you might as well make that clear

oh

wait no

it would just cause an error

cause it's like saying make a string named str and set it equal to name

[zinc nova]

would i do like

a user input thing

[gusty flower]

actually it might be ok

you can just put it as an argument for a method though

cause the method would need some kind of input to do the operations on

static void myMethod(String name) {

}

[zinc nova]

in a completely different part of the assingment he did this

do i need to do any of that

brb 5 mins btw

[gusty flower]

yeah you can just copy what they have and place your code inside

like
public void methodName(parameters){
code goes in here
}

[zinc nova]

what parameters should i put

im back

@gusty flower \

[gusty flower]

you just need the initial string

that you want to modifiy

[zinc nova]

so

[gusty flower]

the string is written in lower case and you are missing the parameter name

[zinc nova]

wdym parameter name

i named it awesomeMethod

instead of methodName

[gusty flower]

thats the method name

the parts that are inside of the ()

you have a type but no name

[gusty flower]

look at this

there is 2 parts

you had the type

but not a name

[zinc nova]

oh

olike

ohh

like

(string methodName)

String methodName

capitalized

[gusty flower]

like public String awesomeMethod(String name)

[zinc nova]

is String in String name defining that name will be a string value

[gusty flower]

it's the name of the string that you will use to change it

[zinc nova]

ok figured

so im good like this then right

[gusty flower]

and you want to return final string at the end

just return finalStr

and put { around the code}

[zinc nova]

okay cool

so in actual java

to use this

theyd call awesomeMethof

d

in their code right

like

with the parameter being whatever they want to switch around

so like

awesomeMethod(Ball) would return alba

i mean

llba

[gusty flower]

you would need the static as well

I forgot about that

[gusty flower]

the void needs to be string

void means you won't return anything

[zinc nova]

wdym

so where do i put it

[gusty flower]

public static String awesomeMethod(String name)

[zinc nova]

can u explain like

what that does

does that make it so it knows that a string type will be returned

so like if i wanted to return an int value would i put public static int

[gusty flower]

yeah

public determines who can use it

static is about classes

like if you want it to be related to the entire class or just an instance of the class

[zinc nova]

ok

tysm so far btw

i joined a diff server and this like

the least helpful person in the universe was "helping" me

can we move on to the part b now then?

[gusty flower]

oh everyone is a beginner so maybe they know what to do but are not really good at explaining or

or they could just not be familiar with java also

could be a lot of things

[zinc nova]

nah he was being like

a dickhead

[gusty flower]

oh

[zinc nova]

like

[gusty flower]

oh but static is like this

like how you have string.length()

[zinc nova]

yea

[gusty flower]

it gives you the length of a string that you are using

so you run it with the actual object

but if you wanted to take a string as a parameter

you could have a static Length(String str) function

that would give you the length of any string you put in

[zinc nova]

oh okay

i kinda understand that

[gusty flower]

you ever use the math class?

like Math.pow()?

[zinc nova]

i dont think so

do u know what this means

i might but idk

[gusty flower]

you know what the methods are?

like String.substring()?

[zinc nova]

1 sec

i might

[gusty flower]

https://www.w3schools.com/java/java_ref_math.asp

these are the math methods

based on the question you can use 3 of these to simplify your answer

[zinc nova]

would i set it up like this

[gusty flower]

status should be static

and this problem is asking for 4 parameters

not just the 1 this time

[zinc nova]

i meant to put that my fault

so like

int x1,x2,y1,y2

[gusty flower]

I think you need the type after each parameter

like int x1,int x2,int y1,int y2

[zinc nova]

does pemdas work in this situation like

(int(x1,x2,y1,y1))

[gusty flower]

I don't think that is related to pemdas

[zinc nova]

nevermind

so

[gusty flower]

but I think you need to write it out how I wrote it afaik

[gusty flower]

yeah the x1 stuff is good

but it's still static

[zinc nova]

omg my fault

[gusty flower]

also do you know what the difference is between and int and a double is?

[zinc nova]

yes

decimal

2.0 2

should it be a double

[gusty flower]

ok so the equation that you were given looks like it might result in a number that isn't a whole number

so you might want to return a double

[zinc nova]

okay

done

i changed it all

to double

[gusty flower]

ok

now you just need to use the math methods

to with the points they gave you

do you have a good understanding of what the question is like what that formula is representing and what x1 and x2 and y1 and y2 is?

[zinc nova]

i know math dw i just dont know what methods id use

[gusty flower]

ok did u go to that site?

[zinc nova]

yea looking thru it rn

so ihave to use 3 of these

[gusty flower]

yeah it's not random though

[zinc nova]

ik

[gusty flower]

the math problem is looking for 3 specific things you have to do

[zinc nova]

so

first id find x1-x2 squared and then for y

and then the sqrt of them added together

so like

i could do xTotal

yTotal

sumTotal

[gusty flower]

sqrt is one

squared is called power

so Pow

square is power raised to 2

and there is one more thing you need

[zinc nova]

are these math methods or ap subset methods btw

bc i have specific ap subset methods i think

i found it

[gusty flower]

http://militantgrammarian.com/DAY/JAVA/java_subsetAB.html

[zinc nova]

omg

these are the ones i use

[gusty flower]

math was listed here

[zinc nova]

yea

oh

idk

the thing i just sent u is what i can use

[gusty flower]

but I dunno maybe check your listing

in your book

[zinc nova]

so

[gusty flower]

I see math in your listing

[zinc nova]

yes i know

i just dont know how to set them up to work if that makes sense

[gusty flower]

break the problem down into parts

so maybe work from the inside out

[zinc nova]

3 parts right

3 methods

so

one would be sqrt(totalSum) totalSum being equal to xSum + ySum

then

would i do double xSum = abs(x1 -x2) how would i use pow in this

[gusty flower]

that is fine to get the abs val

after you have that number

you can run pow on it

like xSum=pow(xSum)

or you can put it inside of the pow function

[zinc nova]

ohhhhhhhhhhhhhh

so

it would be something like

[gusty flower]

like java double xSum=pow(abs(x1-x2))

[zinc nova]

yeah

i was gonna say

[gusty flower]

you generally have to use Math.pow or Math.abs though

I don't think it would work on it's own

but I don't remember

[zinc nova]

double xSumPre = abs(x1-x2)
double xSumPos = pow(xSumPre)

[gusty flower]

yeah that would work

[zinc nova]

then

id do the same for y

right

then id do

double totalSum = sqrt(xSumPos + ySumPos)

[gusty flower]

yeah

[zinc nova]

return totalSum

[gusty flower]

yeah

I think you pretty much got it this time

[zinc nova]

the reason why i have so much trouble rn is because i have 0 foundational java skills

im learning everything before this as i go

[gusty flower]

it's ok

[zinc nova]

im a horrible procrastinator sadly

[gusty flower]

but the input in the question is ints

[zinc nova]

why

the values of x and y dont have to be ints

[gusty flower]

I dunno thats what they said

[zinc nova]

oh

my fault

it does say that

that means there would be no doubles then no?

wait nvm

sqrt

iforgot

[gusty flower]

yeah you got it

[zinc nova]

I freaking hate how much i procrastinate

i literally skipped summer school and missed algebra 2 and precalc and went straight from geo to ap calc bc and somehow passed iwth a 4 last year

Like it was so stressful

[gusty flower]

when using the math methods you need to do Math.pow() or Math.sqrt() I don't think they work alone

[zinc nova]

oh where

would i put that

[gusty flower]

replace pow with Math.pow

and same thing with abs

[zinc nova]

oh i get what u mean

[gusty flower]

and I think doubles should all be lowercase

[zinc nova]

yea

i typoed

it auto uppercases it

capitalizes

sorry im high

yo i appreciate u

like actually tysm

[gusty flower]

np

besides that your just missing the { and ; after every line and the } at the end

[zinc nova]

ik

he didnt put it in the example so i figure he doesnt want it

[gusty flower]

oh ok

and there is a random \ on one of the lines

prob a typo though

[zinc nova]

oh yea

man why tf is java so much more complicated and obese compared to javascript

[gusty flower]

you will get used to it

[zinc nova]

yea sadly

[gusty flower]

it's got it's up and downs

[zinc nova]

i cant wait to transform into afemboy after gaining fluency in java

[gusty flower]

oh well gl with that

[zinc nova]

thank you

ill probably be back here with more questions

like i donte ven know what a scanner is

LIke i have no idea

Zilch zero

[gusty flower]

it's what you use to take in user input I think

[zinc nova]

yea

sum like that

ill ttyl bro i appreciate it its late and i need to pass out and go to school tmr

BYe ❤️

[gusty flower]

later