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Java String Exercise

Posted on 2016-07-26
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Last Modified: 2016-07-31
I am working on an exercise in JAVA 1.8 that goes like this.
I have a String : "Able was I, ere I saw Elba."
I need to remove spaces and punctuation and capitalize it all.
Then I need to save a copy of it in reverse order and compare the two to see if they are the same.

Does anyone have a suggestion on how they might achieve this ?
I was thinking along the lines of a regex /[a-zA-Z]+/g    as a possibility. But I don't know how to extract the words using a RegEx.
The result of the extraction would have the above expression returned as "ABLEWASIEREISAWELBA" .

Thanks,

Dave
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Question by:David King
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LVL 86

Expert Comment

by:CEHJ
ID: 41729398
Some pointers:

String.toUpperCase
String.replace
StringBuilder.reverse
2
 

Author Comment

by:David King
ID: 41729424
Thanks, I'll research the API docs on those.
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Author Comment

by:David King
ID: 41729504
I have tested my RegEx /[a-zA-Z]+/g on my test string and it selects all of the words correctly. Is there a String class method that I can use that will allow me to use my RegEx expression to select the Words in my String and Return them back as a string, leaving the un-selected text behind?
?
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Expert Comment

by:CEHJ
ID: 41729565
I have tested my RegEx /[a-zA-Z]+/g on my test string and it selects all of the words correctly.
How and where?
Is there a String class method that I can use that will allow me to use my RegEx expression to select the Words in my String and Return them back as a string
That's not really how regex works. You need to think about replacement
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Author Comment

by:David King
ID: 41729600
I am trying to use the String.replace(regex , string) method to get the job done.

Like this;

public class PalCode
{

    public PalCode()
    {
        String palString = new String("Able was I, ere I saw Elba."); // original input String
        String workedString = new String(""); // String after manipulation
        workedString = palString.replace("[^a-zA-Z]+/g" , "");
        System.out.println("Manipulated string result is: " + workedString);

    }
}// end class PalCode

The regex expression should match character that are NOT a-z or A-Z and replace them with "nothing".
The program runs and compiles without any errors but the regex has NO effect. ??
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Accepted Solution

by:
David King earned 0 total points
ID: 41729612
OK, I got it. This works.

public class PalCode
{

    public PalCode()
    {
        String palString = new String("Able was I, ere I saw Elba."); // original input String
        String workedString = new String(""); // String after manipulation
        workedString = palString.replaceAll("[^a-zA-Z]+" , "").toUpperCase();
        System.out.println("Manipulated string result is: " + workedString);

    }
}// end class PalCode


("Able was I, ere I saw Elba."); // original input String
Manipulated string result is: ABLEWASIEREISAWELBA
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Expert Comment

by:awking00
ID: 41729632
The String replace method will replace a char sequence or array. I think you should look at the replaceAll method which takes a regular expression as its first argument.
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Expert Comment

by:awking00
ID: 41729634
Too late with my replaceAll suggestion :-(
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LVL 32

Expert Comment

by:awking00
ID: 41729645
Now you just need to create a string that's the reverse of the string you have and compare them to complete your task.
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LVL 16

Expert Comment

by:krakatoa
ID: 41729717
When you come back again with your next question, be great if you could stick your code in the code formatting delimiters. ;)
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Author Closing Comment

by:David King
ID: 41736374
Figured it out.
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