If you want to be able to call fourth with a List<List<String>> argument, then you’ll need to change your signature to this: private static void fourth(List<? extends List<?>> a){ System.out.println(“List of a List of anything “); } The above will work because unlike List<List<?>>, List<? extends List<?>> is compatible with List<List<String>>. Think of it this … Read more
It turns out that a directory had an ! in its name and eclipse had a problem with that. Once I switched the directory (from Desktop which is located in the user directory which had ! in it to C:/ ) everything worked fine. (look at the Djava.class.path in the image located in my the … Read more
You can either Widen or Box but you cannot do both, unless you are boxing and widening to Object (An int to Integer(Boxing) and then Integer to Object(Widening) is legal, since every class is a subclass of Object, so it is possible for Integer to be passed to Object parameter) Similarly an int to Number … Read more
WebSphere Application Server V7 does support Java Platform, Standard Edition (Java SE) 6 (see Specifications and API documentation in the Network Deployment (All operating systems), Version 7.0 Information Center) and it’s since the release V8.5 when Java 7 has been supported. I couldn’t find the Java 6 SDK documentation, and could only consult IBM JVM … Read more
It seems that JDK7 process intern in a different way as before. I tested it with build 1.7.0-b147 and got “both are equal”, but when executing it (same bytecode) with 1,6.0_24 I do not get the message. It also depends where the String b2 =… line is located in the source code. The following code … Read more
yes, of course. Apache VFS does exactly this. you can find it under http://commons.apache.org/vfs/. It’s a pure java library that can monitor files and it’s pretty easy to use: FileSystemManager manager = VFS.getManager(); FileObject file= manager.resolveFile(“c:/MyFile.txt”); DefaultFileMonitor fm = new DefaultFileMonitor(new MyListener()); fm.setDelay(5000); fm.addFile(file); fm.start(); the code above will monitor the file c:/MyFile.txt. if it … Read more
In Java 6, there is unfortunately no way to determine why a file cannot be deleted. With Java 7, you can use java.nio.file.Files#delete() instead, which will give you a detailed cause of the failure, if the file or directory cannot be deleted. Note that file.list() may return entries for directories, which can be deleted. The … Read more
Answer Clarification – Android Studio supports JDK8 The following is an answer to the question “What version of Java does Android support?” which is different from “What version of Java can I use to run Android Studio?” which is I believe what was actually being asked. For those looking to answer the 2nd question, you … Read more
What I eventually used was this: try { // Set up the socket address InetSocketAddress address = new InetSocketAddress(InetAddress.getLocalHost(), config.getHttpsPort()); // Initialise the HTTPS server HttpsServer httpsServer = HttpsServer.create(address, 0); SSLContext sslContext = SSLContext.getInstance(“TLS”); // Initialise the keystore char[] password = “simulator”.toCharArray(); KeyStore ks = KeyStore.getInstance(“JKS”); FileInputStream fis = new FileInputStream(“lig.keystore”); ks.load(fis, password); // Set … Read more
Seems that you can use this: import java.util.Calendar; import javax.xml.bind.DatatypeConverter; public class TestISO8601 { public static void main(String[] args) { parse(“2012-10-01T19:30:00+02:00”); // UTC+2 parse(“2012-10-01T19:30:00Z”); // UTC parse(“2012-10-01T19:30:00”); // Local } public static Date parse(final String str) { Calendar c = DatatypeConverter.parseDateTime(str); System.out.println(str + “\t” + (c.getTime().getTime()/1000)); return c.getTime(); } }