How can I Copy files from one directory to another in Java

Question

I want to copy files from one directory to another (sub-directory) using Java. I have a directory, dir, with text files. I iterate over the first 20 files in dir, and want to copy them to another directory in the dir directory, which I have created right before the iteration. In the code, I want to copy the rw to trainDir. How can I do this? 
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Answer 1

own vote

Spring Framework has some similar util classes like Apache Commons Lang. So there is org.springframework.util.FileSystemUtils

File source = new File("/home/user/source");

File dest = new File("/home/user/dest");
FileSystemUtils.copyRecursively(source, dest);

Hope this helps!!

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Answer 2

Java 8

Path sourcepath = Paths.get("C:\\data\\temp\\mydir");
        Path destinationepath = Paths.get("C:\\data\\temp\\destinationDir");        
        Files.walk(sourcepath)
             .forEach(source -> copy(source, destinationepath.resolve(sourcepath.relativize(source)))); 

Copy Method

static void copy(Path source, Path dest) {
        try {
            Files.copy(source, dest, StandardCopyOption.REPLACE_EXISTING);
        } catch (Exception e) {
            throw new RuntimeException(e.getMessage(), e);
        }
    }