How to change value of arraylist element in java

Question

1.00/5 (1 vote)

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1 -- change to 4
4 -- change to 9
9 -- change to 25
16 -- change to 10000
25 -- change to 49
36 -- change to 9
49 -- change to 25
64 -- change to 9
81 -- change to 1
100 -- change to 16

What I have tried:

System.out.println(Numbers.toString().trim().replaceAll(",","").replaceAll(" ", "\n").replace("[","").replace("]", "").replace("1", "4"));

but everytime i change 1 all number have a 1 it all change to 4 lol any answer and suggestion?

Posted 13-Oct-21 5:27am

Marvin Añasco

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Comments

Richard MacCutchan 13-Oct-21 11:40am

Why are you converting an array to a string? Also complex statements like that are almost impossible to debug. Write your code one step at a time so you can actually see what is happening at each step. You need to show the actual code where the array is created and explain what you are trying to do.

Marvin Añasco 13-Oct-21 11:52am

all number that i store in arraylist are String<> that's whay i use toString, even if i store Integer it is they same answer like arraylist

Richard MacCutchan 13-Oct-21 11:56am

That does not make sense; if all the numbers are strings, why are you calling toString on them? And as I said, you need to show the actual array and the code that initialises it, as well as a better explanation of what you are trying to achieve.

Marvin Añasco 13-Oct-21 12:04pm

ok got it , but w8 can u give some hint regarding with this problem

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