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In java I noticed there are methods associated with conversion of strings and those methods sometimes use the word "parse" in the name of the method. For example the static method,
static int parseInt(String str)
is used to convert a string into int. My question is this. Is "parse" short for another word? Is it just a random word or did it come from somewhere else in some other programming context in Java or anywhere else?
From wikipedia:
Parsing or syntactic analysis is the process of analysing a string of symbols, either in natural language or in computer languages, according to the rules of a formal grammar. The term parsing comes from Latin pars (ōrātiōnis), meaning part (of speech).
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Googling didn't help me out so I came here. What is the use of int hash32() method in String? As the name suggest it looks like for some hashing but how and where exactly it is used?
The answer is right here. Here are some choice snippets:
Java SE 7u6 introduces an improved, alternative hash function...
The alternative hash function improves the performance of these map implementations when a large number of key hash collisions are encountered.
The alternative hash function is only applied to keys of type String.
As stated by #Slanec, Java 8 made some changes to HashMap that reduced the performance drop for heavy collisions to O(lg n) instead of O(n) for Comparable keys, so there was no longer a need for alternative String hashing.
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I want to detect the file structure in a string.
e.g
if I have a string as /name/test/testme/2 I should be able to store it in a arraylist as different elements like {[name],[test],[testme],[2]}
String[] elements = "/name/test/testme/2".split("/");
More info can be found in the String.split() Javadoc
As Lukas pointed out, (please give him some upvoting) you should use the split method.
String[] elements = "/name/test/testme/2".split("/");
The regular expressions are not used to split strings in sections. Regular expressions are used for matching the target string with a specific generic format. In this case a boolean value indicating if the strings match is returned.
Hope I helped!
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here is the non-oop way of doing it:
When someone presses a day on a calendar, we need to find out the day, and path. Here is the non-oop way of storing that information:
A string was created with a "-" delimiter between each piece of info we need, like this:
12-c:\files\john_doe.png
Then it was stored in an array. However, to retrieve the data, we then use the "split" function like this.
for (int t = 0;t < day_and_path.length;t++)
{
String[] day_from_db = day_and_path[t].split("-");
String day_db = day_from_db[0];
String path_db = day_from_db[1];
However the OOP way is, make a class with properties: day, path. Then store them into an array of objects.
Which way is better and why?
If you use String#split, you'll be dealing with an array of strings. If all you do is assign the strings to local variables, then there is no point in making a class for that.
If you want to hold on to the string parts and pass them around to other methods, then it begins to make sense to have an object which will conveniently encapsulate those strings.
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I am currently trying to make use of the java string function someString.replaceAll() to find commonly used words (and, the, by, of, etc) and replace them with " ". Based on the answers to the question at Whitespace Matching Regex - Java, I produced this function call:
data.replaceAll("(?i)\\sthe\\s", " ")
However, it isnt working and I'm really not sure why. Nothing about it looks wrong based on what I've found. Please help me!
Strings are immutable!
data = data.replaceAll("(?i)\\sthe\\s", " ");
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Can you use strings in some way to define the source and target of files.move.
Heres the documentation http://docs.oracle.com/javase/tutorial/essential/io/move.html
According to the javadoc, you can not use strings as arguments for Files.move .
What seems to be a better solution for you, is using the rename method on File. Something like this:
File file = new File("/path/to/file/to/be/moved");
boolean moved = file.renameTo("/new/path/for/the/file");
if(!moved)
//Handle the error
Short answer is no: Files.move requires Path objects. That said, you can use Paths.get(str) to simply turn a String into a Path.