CODEWITHSUNDEEP
javaandroid
user3207741
user3207741

Reputation: 47

I cannot understand API docs for Java/Android?

Consider the following code snippet for reading a file in Java/Android:

FileInputStream fis = openFileInput("myfile.txt");
BufferedInputStream bis = new BufferedInputStream(fis);
StringBuffer b = new StringBuffer();
while (bis.available()!=0) {
    char c = (char) bis.read();
    b.append(c);
}
bis.close();
fis.close();

I am talking about available() method in the condition of while loop. I looked the API documentation for that method and I have the following questions:

Upvotes: 2

Views: 188

Answers (2)

Josef E.
Josef E.

Reputation: 2219

The available method returns an int as an estimate of the number of bytes that can be read (or skipped over) from this input stream without blocking by the next invocation of a method for this input stream.

That while loop is iterating till the end of the file essentially, when there is no bytes there is no file.

Here is some documentation: http://docs.oracle.com/javase/7/docs/api/java/io/BufferedInputStream.html

Upvotes: 4

hunain60
hunain60

Reputation: 337

The bis.available functions checks for end of file. in each iteration of the while loop when u do bis.read() the file pointer reads one character and automatically moves on to the next one.

As far as your query about which method to use. just look up the parameters that the function takes. and what u need to accomplish. its not very difficult figuring that out.

Upvotes: 1

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