Removing all empty elements from an character array

Question

I have a character array that can hold maximum 50000 characters at a time. Contents of this array are coming through socket connections. However it is not guaranteed that th

Answer 1

use an array list instead! This wil allow you to remove array elements, whereas the standard array package has no 'easy' way of doing this.

ArrayList buffer = new ArrayList (50000)

buffer.add(x)

buffer.remove(x)

http://docs.oracle.com/javase/6/docs/api/java/util/ArrayList.html

Note: instantiate a type on the ArrayList

Answer 2

I would suggest converting the array to a string and using the replaceAll and trim functions to remove the empty elements.

String bufferString = new String(buffer).trim().replaceAll(" ", "");

This does not require any additional libraries.

Answer 3

StringWriter writer = new StringWriter();
IOUtils.copy(inputStream, writer, encoding);
String theString = writer.toString();

OR

String theString = IOUtils.toString(inputStream, "UTF-8");

Answer 4

something like that should work too :

public String readBufferUpdate() throws IOException {
  char[] buffer =new char[50000];
  is.read(buffer);

  return new String(ArrayUtils.removeElements(buffer, ''));
}

Doc here : http://commons.apache.org/proper/commons-lang/javadocs/api-3.1/org/apache/commons/lang3/ArrayUtils.html#removeElements(char[], char...)

Answer 5

Correct way to read from an InputStream in a buffer is as follows.

public String readBufferUpdate() throws IOException {
    char[] buffer =new char[50000];
    int bytesRead = is.read(buffer, 0, buffer.length);
    return new String(buffer, 0, bytesRead);
}

Here you is.read() returns how many bytes have been read into bytesRead. Only that many bytes are copied from the buffer to String.