java-io

Is there anyway to check whether an OutputStream is closed without attempting to write to it and catching the IOException ? For example, consider the following contrived method: public boolean isStreamClosed(OutputStream out){ if( /* stream isn't closed */){ return true; }else{ return false; } } What could you replace /* stream isn't closed */ with? The underlying stream may not know it its closed until you attempt to write to it (e.g. if the other end of a socket closes it) The simplest approach is to use it and handle what happens if it closed then, rather than testing it first as well. No

I have been trying to do a little project that needs an appendable ObjectOutputStream. I have gone through a couple of solutions and i found this It seemed to solve my problem at first. But on further development of my project i started getting unexpected exceptions. The following are my classes. public class PPAccount implements Serializable { private Profile profile; private String email; private float accountBal; private boolean isActivated; private String activationCode; private ArrayList<Transaction> transactions; //a few functions } public class PPRestrictedAccount extends PPAccount {

This question already has an answer here: Easy way to write contents of a Java InputStream to an OutputStream 22 answers I was to trying to find the best way to pipe the InputStream to OutputStream. I don't have an option to use any other libraries like Apache IO. Here is the snippet and output. import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.nio.channels.FileChannel; public class Pipe { public static void main(String[] args) throws Exception { for(PipeTestCase testCase : testCases

I started with requirement of reading and writing files in from/in a directory on a remote Ubuntu machine. First, I wrote a Java program that could read,write files from a shared folder on a remote Windows machine i.e on a LAN. Here, something like this works on my(local) Windows machine : File inputFile = new File( "\\172.17.89.76\EBook PDF");/*ignore the syntax errors, the loc is just for the idea*/ Now when I consider a remote Ubuntu machine, obviously I cannot do something like this as the machine is not on the LAN( I'm not sure if that can be done even if it is on the LAN !). Hence, I

This question already has an answer here: Writing in the beginning of a text file Java 5 answers I need to add text to beggining of text file via Java. For example I have test.txt file with data: Peter John Alice I need to add(to top of file): Jennifer It should be: Jennifer Peter John Alice I have part of code, but It append data to end of file, I need to make It that added text to top of file: public static void irasymas(String irasymai){ try { File file = new File("src/lt/test.txt"); if (!file.exists()) { file.createNewFile(); } FileWriter fw = new FileWriter(file.getAbsoluteFile(), true);