outputstream

问题 Someone explain to me what InputStream and OutputStream are? I am confused about the use cases for both InputStream and OutputStream . If you could also include a snippet of code to go along with your explanation, that would be great. Thanks! 回答1: The goal of InputStream and OutputStream is to abstract different ways to input and output: whether the stream is a file, a web page, or the screen shouldn't matter. All that matters is that you receive information from the stream (or send

问题 I am writing a program in Java which displays a range of afterschool clubs (E.G. Football, Hockey - entered by user). The clubs are added into the following ArrayList : private ArrayList<Club> clubs = new ArrayList<Club>(); By the followng Method: public void addClub(String clubName) { Club club = findClub(clubName); if (club == null) clubs.add(new Club(clubName)); } \'Club\' is a class with a constructor - name: public class Club { private String name; public Club(String name) { this.name =

问题 I am using HTTPURLConnection to connect to a web service. I know how to use HTTPURLConnection but I want to understand how it works. Basically, I want to know the following: On which point does HTTPURLConnection try to establish a connection to the given URL? On which point can I know that I was able to successfully establish a connection? Are establishing a connection and sending the actual request done in one step/method call? What method is it? Can you explain the function of

问题 #include <iostream> using namespace std; int main() { char c1 = 0xab; signed char c2 = 0xcd; unsigned char c3 = 0xef; cout << hex; cout << c1 << endl; cout << c2 << endl; cout << c3 << endl; } I expected the output are as follows: ab cd ef Yet, I got nothing. I guess this is because cout always treats \'char\', \'signed char\', and \'unsigned char\' as characters rather than 8-bit integers. However, \'char\', \'signed char\', and \'unsigned char\' are all integral types. So my question is:

问题 I couldn\'t find an authoritative answer to this with some Googling. In Java servlets, one can access the response body via response.getOutputStream() or response.getWriter(). Should one call .close() on this stream after it has been written to? On the one hand, there is the Blochian exhortation to always close output streams. On the other hand, I don\'t think that in this case there is an underlying resource that needs to be closed. The opening/closing of sockets is managed at the HTTP level

问题 I am on the stage of development, where I have two modules and from one I got output as a OutputStream and second one, which accepts only InputStream . Do you know how to convert OutputStream to InputStream (not vice versa, I mean really this way) that I will be able to connect these two parts? Thanks 回答1: An OutputStream is one where you write data to. If some module exposes an OutputStream , the expectation is that there is something reading at the other end. Something that exposes an

问题 I need to store data into files inside .jar file and read it again. I know that I can use Class.getResourceAsStream() method but it returns an InputStream that I can read from. But I look for a way to write. 回答1: I need to store data into files inside .jar file and read it again No you don't. Instead store the 'default' file inside the Jar. If it is changed, store the altered file in another place. One common place is a sub-directory of user.home . When checking for the file, first check the