Java: IndexOf(String string) that returns wrong character

Question

I am writing a file browser program that displays file directory path while a user navigates between folders/files.

I have the following String as file path:

"Files > Cold Storage > C > Capital"

I am using Java indexOf(String) method to return the index of 'C' character between > C >, but it returns the first occurrence for it from this word Cold.

I need to get the 'C' alone which sets between > C >. This is my code:

StringBuilder mDirectoryPath = new StringBuilder("Files > Cold Storage > C > Capital");
String mTreeLevel = "C";
int i = mDirectoryPath.indexOf(mTreeLevel);
if (i != -1) {
    mDirectoryPath.delete(i, i + mTreeLevel.length());
}

I need flexible solution that fits other proper problems Any help is appreciated!

simply check if the word has a space before and after the character — user2693587
– user2693587, Commented Jun 24, 2015 at 9:28

OldCurmudgeon · Accepted Answer · 2015-06-24 09:34:33Z

1

A better approach would be to use a List of Strings.

public void test() {
    List<String> directoryPath = Arrays.asList("Files", "Cold Storage", "C", "Capital");
    int cDepth = directoryPath.indexOf("C");
    System.out.println("cDepth = " + cDepth);
}

answered Jun 24, 2015 at 9:34

OldCurmudgeon

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Comments

Eran · Accepted Answer · 2015-06-24 09:32:10Z

1

Search for the first occurance of " C " :

String mTreeLevel = " C ";
int i = mDirectoryPath.indexOf(mTreeLevel);

Then add 1 to account to get the index of 'C' (assuming the String you searched for was found).

If you only want to delete the single 'C' character :

if (i >= 0) {
    mDirectoryPath.delete(i + 1, i + 2);
}

EDIT:

If searching for " C " may still return the wrong occurrence, search for " > C > " instead.

edited Jun 24, 2015 at 9:32

answered Jun 24, 2015 at 9:28

Eran

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2 Comments

blueware Over a year ago

Assume I have this string "Files > Cold C Storage > C > Capital" then it will get the wrong occurrence for ` C ` !!

Eran Over a year ago

@blueware You can search for "> C >" instead.

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