How do I code for specific letters in java

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how to code a java program using nested selection statement and a while loop that takes user input a word (string) and generates a password based on the following conversion:
 If the character being analyzed is a digit, concatenate the digit character to the new string.
 If the character is a lowercase letter, concatenate the corresponding character to the new string as listed in the table below.
 If the character being analyzed is anything other than a lower-case letter or digit, replace it by an (*) for that character.Also,my program should ask the user for a new word until the user enters ‘NO’, ’no’, or ‘No’ to stop.
Conversion table for each letter
a, b, c , d=#
e, f , g, h=@
i, j, k, l=?
m, n, o, p=%
q, r, s , t=&
u, v, w, x=$
y,z=!

What I have tried:

I tried switch case but i do not know how to replace specific letters in a string.

Posted 9-Oct-22 15:12pm

lolilo289

Updated 9-Oct-22 18:29pm

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OriginalGriff · Answer 1 · 2022-10-09T18:29:00

Solution 1

Create a new string, and add each existing or replaced character to it one at a time. By preference, use a StringBuilder (Java Platform SE 7 )[^] as strings are immutable and convert it to a string at the end.

Posted 9-Oct-22 18:29pm

OriginalGriff

Comments

lolilo289 10-Oct-22 7:26am

How do I replace each letter of string of the user input.The string is not specific….also it has to be a nested selection statement and a while loop….?

OriginalGriff 10-Oct-22 7:52am

And?
What have you tried?
Where are you stuck?
Did you read what I said above?

lolilo289 10-Oct-22 12:40pm

I don't understand like how to create a new string for each character.I did string word = kb.next(); After that to replace each character do i use replace?If you can please show me an example or a video where they explain how to replace chracters.....

OriginalGriff 10-Oct-22 13:09pm

Why would you want to do that?

lolilo289 10-Oct-22 13:13pm

I should replace the characters of the user input word that's why I did string word = kb.next();.... after that i am stuck because i need to use nested selection statement and a while loop...which is confusing to me.

OriginalGriff 10-Oct-22 13:18pm

So why would that need a separate string for each character?

Take a step back, and read the assignment again carefully. Then read what I originally said and think about it. You'll get the idea!

lolilo289 10-Oct-22 13:40pm

Huh? I am still confused.So I do not need string word =kb.next();.I am still new to coding so there are some methods I still do not know what they are...