New Feature of Java SE 7

Insert Picture Here>Java SE 7 Java Fusion Middleware Java http://yoshio3.com

    Map<String, String> map = new HashMap<String, String>(); Map<String, Map<Integer, String>> map = new HashMap<String, Map<Integer, String>>();  Map<String, String> map = new HashMap<>(); Map<String, Map<Integer, String>> map = new HashMap<>();      Copyright© 2011, Oracle. All rights reserved.

      private static void copyFile(File source, File target) { try (InputStream fin = new FileInputStream(source); OutputStream fout = new FileOutputStream(target)){ byte[] buf = new byte[8192]; int i; while ((i = fin.read(buf)) != -1) { fout.write(buf, 0, i); } }catch (Exception e) { e.printStackTrace(); } } Copyright© 2011, Oracle. All rights reserved.

  FileSystem fSystem = FileSystems.getDefault();! Path path1 = fSystem.getPath("/var/tmp/README.txt");! try(BufferedReader reader = ! Files.newBufferedReader(path1,! Charset.forName("UTF-8"))) {! String line;! while ((line = reader.readLine()) != null)! System.out.println(line);! } catch (IOException ioe) {! ioe.printStackTrace();! } Copyright© 2011, Oracle. All rights reserved.

  Path path1 = Paths.get("/var","tmp","README.txt");! Path path2 = Paths.get(URI.create("file:///var/tmp/README.txt"));! Path path3 = Paths.get(System.getProperty("user.home"),"README.txt"); Copyright© 2011, Oracle. All rights reserved.

  Path path = Paths.get("/var","tmp","README.txt");!System.out.format("toString: %s%n", path.toString());!System.out.format("getFileName: %s%n", path.getFileName());!System.out.format("getName(0): %s%n", path.getName(0));!System.out.format("getNameCount: %d%n", path.getNameCount());!System.out.format("subpath(0,2): %s%n", path.subpath(0,2));!System.out.format("getParent: %s%n", path.getParent());!System.out.format("getRoot: %s%n", path.getRoot()); toString: /var/tmp/README.txt!getFileName: README.txt // !getName(0): var //Path 0 !getNameCount: 3 //Path !subpath(0,2): var/tmp // !getParent: /var/tmp // !getRoot: / // Copyright© 2011, Oracle. All rights reserved.

  Path path = Paths.get(URI.create(”! file:///var/test/../tmp/README.txt")); !Path norm = path.normalize();!System.out.format("path.toString: %s%n", ! path.toString());!System.out.format("norm.toString: %s%n", ! norm.toString()); path.toString: /var/test/../tmp/README.txt!norm.toString: /var/tmp/README.txt Copyright© 2011, Oracle. All rights reserved.

  Path path2 = Paths.get("../","var","test","README.txt"); ! try{! Path real = path2.toRealPath(true);! System.out.format("real.toString: %s%n", real.toString());! }catch(java.nio.file.NoSuchFileException | IOException ioe){! ioe.printStackTrace();! }! real.toString: /var/test/README.txt Copyright© 2011, Oracle. All rights reserved.

  Path path = Paths.get("/var/tmp/foo");! Path path2 = Paths.get("/var/tmp/bar");!! Path fooToBar = path.relativize(path2);! System.out.format("fooToBar.toString: %s%n", ! fooToBar.toString()); fooToBar.toString: ../bar Copyright© 2011, Oracle. All rights reserved.

  public class CreateDirectory{! public static void main(String argv[]){! Path directory = Paths.get("/var/tmp/dir");! try{! Files.createDirectory(directory);! }catch(IOException ioe){! ioe.printStackTrace();! }! }!} Copyright© 2011, Oracle. All rights reserved.

  Path textFile = Paths.get("C:test.txt");! try(OutputStream out = Files.newOutputStream(textFile, ! StandardOpenOption.APPEND);! BufferedWriter bout = new BufferedWriter(! new OutputStreamWriter(out,"UTF-8"))){! bout.write("ADDITIONAL TEXTn");! }catch(IOException e){! System.err.println(e);! }! Copyright© 2011, Oracle. All rights reserved.

  try{! from = new FileInputStream(sourceFile);! to = new FileOutputStream(toFile);! byte[] buffer = new byte[4096];! int byteRead;! while((byteRead = from.read(buffer)) != -1)! to.write(buffer,0,byteRead);!} catch(IOException){} finally{! …! } FileSystem local = FileSystems.getDefault();! Path from = local.getPath(sourceFile);! Path to = local.getPath(toFile);! Files.copy(from, to, REPLACE_EXISTING); ! Copyright© 2011, Oracle. All rights reserved.

  Path target = Paths.get("/tmp/source.txt");!Path newLink = Paths.get("/tmp/symbolic.txt");!try{! Files.createSymbolicLink(newLink, target);!}catch(IOException | UnsupportedOperationException e){! System.err.println(e);!}! java.lang.UnsupportedOperationException:Symbolic links not supported on this operating system Copyright© 2011, Oracle. All rights reserved.

        finalFileSystem fs = FileSystems.getDefault();!Path startPath = fs.getPath(startDir);!SimpleFileVisitor visitor = new SimpleFileVisitor<Path>(){! @Override! public FileVisitResult visitFile(Path file, ! BasicFileAttributes attr) throws IOException{! PathMatcher matcher = fs.getPathMatcher("glob:*.txt");! if(matcher.matches(file.getFileName()))! System.out.println(file.toAbsolutePath());! return super.visitFile(file, attr);! }};!Files.walkFileTree(startPath, visitor);! Copyright© 2011, Oracle. All rights reserved.

FileSystem fs = FileSystems.getDefault();!WatchService ws = fs.newWatchService();! Path path = fs.getPath("C:tmp");! path.register(ws, StandardWatchEventKind.ENTRY_CREATE, ! StandardWatchEventKind.ENTRY_DELETE, ! StandardWatchEventKind.ENTRY_MODIFY);!for (;;) {! WatchKey key = ws.take();! List<WatchEvent<?>> events = key.pollEvents();! for (WatchEvent obj : events) {! System.out.println(obj.kind().name()+ "tFileName: " ! + obj.context().toString());! }! key.reset();! }! Copyright© 2011, Oracle. All rights reserved.

        FileSystem fs = FileSystems.getDefault();! for(FileStore fstore: FileSystems.getDefault().getFileStores()){! long total = fstore.getTotalSpace() / 1024 ;! long used = (fstore.getTotalSpace() – ! fstore.getUnallocatedSpace()) / 1024 ;! long available = fstore.getUsableSpace() / 1024 ;! System.out.format(“%-15s %10d %14d %16d %n”,! fstore,total,used,available);! }! }! Copyright© 2011, Oracle. All rights reserved.

  •  •  MethodHandle invokedyanamic •  Reflection     MethodType mt;! MethodHandle mh;! MethodHandles.Lookup lookup = MethodHandles.lookup();! mt = MethodType.methodType(String.class, char.class, ! char.class);! mh = lookup.findVirtual(String.class, "replace", mt); ! String s = (String) mh.invokeExact("daddy",d,n); ! System.out.println(s);! Copyright© 2011, Oracle. All rights reserved.

  class MergeSort{ ! public int[] sort(int[] all){! if (all.length == 1) { ! return all;! } else { ! int[] left = new int[all.length/2]; ! System.arraycopy(all,0,left,0,left.length]; ! int[] right = new int[all.length – left.length];! System.arraycopy(all,left.length,right,! 0,right.length);! left = sort(left); ! right = sort(right); ! merge(left,right,all); ! return all;! }! }}! Copyright© 2011, Oracle. All rights reserved.

  public class MergeSort{ ! public int[] sort(int[] all){! int threads = Runtime.getRuntime().availableProcessors();! ForkJoinExecutor pool = new ForkJoinPool(threads); ! SortImpl sort = new SortImpl(all); ! pool.invoke(sort); ! return sort.result;! }!private class SortImpl extends RecursiveAction{ ! private int[] all; ! private int[] result;! SortImpl(int all){ ! this.all = all;! }! …! Copyright© 2011, Oracle. All rights reserved.

  protected void compute(){ ! if ((all.length < 10 )) {! result = sequentialSort(all); ! } else {! int[] left = new int[all.length/2]; ! System.arraycopy(all,0,left,0,left.length); ! int[] right = new int[all.length – left.length];! System.arraycopy(all,left.length,right,0,right.length);! SortImpl task1 = new SortImp(left); ! SortImpl task2 = new SortImp(right); ! invokeAll(task1,task2); ! left = task1.result;! right = task2.result; ! merge(left,right,all); ! result = all;! }}! Copyright© 2011, Oracle. All rights reserved.

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New Feature of Java SE 7

by Oracle Fusion Middleware on May 24, 2011

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New Feature of Java SE 7 — Presentation Transcript