This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
Concatenating WAV files in Java
What's the simplest way to concatenate more than two WAV files in Java?
If you're asking about concatenating more than two, I'll assume that you already have a way to concatenate exactly two.
In which case you can concatenate multiple files together by simply concatenating each file in turn to the rolling total. Something like this (for four files):
concatenate(concatenate(concatenate(wav1, wav2), wav3), wav4);
Related
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Reading a plain text file in Java
(31 answers)
Closed 4 years ago.
So I need to read multiple lines of text from a file in Java, for example a txt file record of peoples names height age etc.
I then need to print certain lines from the file, and certain columns, and then sort them based on tallest/oldest etc. How would I go about doing this?
I think I need to put the data from the txt file into an array? But not quite sure.
if I understood the problem, you can create a Class called Person (os something else as you wish) with all the data that you have. than read the file using a Scanner and for each line you can instantiate a new Person and add it to an ArrayList. after you finish reading all the lines from your file, you can use Collections.sort() (you can use the one with a Comparator or use the natural ordering).
links to Collections.sort Javadoc
https://docs.oracle.com/javase/6/docs/api/java/util/Collections.html#sort(java.util.List)
https://docs.oracle.com/javase/6/docs/api/java/util/Collections.html#sort(java.util.List,%20java.util.Comparator)
This question already has answers here:
Searching for a sequence of Bytes in a Binary File with Java
(5 answers)
Closed 5 years ago.
I come up an idea to read a byte[] array with the same size of the input, and check one by one. But it seems not very efficient. Is there a way to solve it by using rolling hash?
If you are using java 8 or above please check the
java.util.Optional<T>
The documentation is here
Optional
If I got what you mean correctly
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How to construct a relative path in Java from two absolute paths (or URLs)?
(23 answers)
Closed 6 years ago.
I have two File objects:
C:/basepath/
C:/basepath/directory/file.txt
Now I would like to subtract file 1 from file 2 so that I get directory/file.txt.
I don't want to use String.substring() since file paths may differ from input.
Use the features of java.nio.file.Path. You are looking to 'relativize'.
This question already has answers here:
Closed 11 years ago.
Possible Duplicate:
How would I Evaluate a certain formula?
How would I split this formula into an array of characters each having their own number in the array:
a1+a2+a5*((a1+a6)*a3)
one I have added the spaces I am going to get column 1 because a1 will indicate column one and it will contain a number than I will add that to column 2. I am not allowed to use a tree or any of those other things just stacks and I have been asking that. But people keep telling me to use libraries and trees I am only in a 200 level course !
You need a grammar and a parser to do this in a general way. Something like this.
This question already has answers here:
How to construct a relative path in Java from two absolute paths (or URLs)?
(23 answers)
Closed 6 years ago.
Is there an open source library that, given ...
/a/b/c
/a/b/c/d/e
would return ../..
or for that matter given
/a/b/c/d
/a/b/c/e
would return ../d
?
If you don't mind passing by converting your Strings into URI then this latter one has the method relativize which should do exactly what you want, take a look here.