Tahák na OSTRAJavu

• Java 7 API
• Java 8 API
• Hnetynka homepage
• Google search: foobar inurl:https://docs.oracle.com/javase/7/docs/api/
• Google search: foobar inurl:https://docs.oracle.com/javase/8/docs/api/

public class PrefixPrinter extends GenericPrinter { }

package cz.nsalitomerice.java.logger;
import cz.nsalitomerice.java.logger.SinglePrinterLogger;

Iterator<Object> iter = foo.iterator();
while(iter.hasNext()) {
    System.out.println(iter.next());
}

public interface MyCollection {
    public void add(Object o);
    public Object get(int i);
    int size();
}
...
public class MyImpl implements MyCollection, Iterable<Object> { ... }

char[] newarr = new char[666];

System.arraycopy(zdroj, zdrojpos, cíl, cílpos, kolik);

int[][] multi = new int[5][10];
int[][] multi = new int[][]{
  { 1, 2, 3},
  { 9, 8, 7} };

try {
    return arr[i];
} catch(ArrayIndexOutOfBoundsException e) {
    System.out.println("idx out of range");
    return 0;
}

public Iterator<Character> iterator() {
    return new Iterator() {
        private int index = 0;
        @Override
        public boolean hasNext() {
            return index < ptr;
        }
        @Override
        public Character next() {
            return arr[index++];
        }
    };
}

DataInputStream di = new DataInputStream(
    new BufferedInputStream (
        new FileInputStream("passwd")));

ArrayList<String> users = new ArrayList<>();
ArrayList<Integer> uids = new ArrayList<>();
int sect = 0;
StringBuilder el = new StringBuilder();
while(true) {
    int r = di.read();
    if (r<0) {
        break;
    }
    if(r == ':') {
        if(sect == 0) {
            users.add(el.toString());
        }
        if(sect == 2) {
            uids.add(Integer.parseInt(el.toString()));
        }
        sect++;
        el = new StringBuilder();
    } else if(r == '\n') {
        sect = 0;
        el = new StringBuilder();
    } else {
        el.append((char)r);
    }
   
}

Scanner scanner = new Scanner(System.in);
String user = scanner.next();
int uid = scanner.nextInt();

DataOutputStream ds = new DataOutputStream(
    new BufferedOutputStream (
        new FileOutputStream("passwd", true)));

ds.writeChars("ahoj");
ds.close();

java.nio.file.Path p2 = java.nio.file.Paths.get(args[1]);
if(Files.isDirectory(p2)) {
    java.nio.file.Path srcpath = java.nio.file.Paths.get(infile);
    java.nio.file.Path dstpath = java.nio.file.Paths.get(args[1] + "/" + infile);
    java.nio.file.Files.copy(srcpath, dstpath, java.nio.file.StandardCopyOption.REPLACE_EXISTING);
    System.exit(0);
}

DataInputStream di = new DataInputStream(
    new BufferedInputStream (
        new FileInputStream(infile)));
DataOutputStream ds = new DataOutputStream(
    new BufferedOutputStream (
        new FileOutputStream("soutfile.txt")));
while(true) {
    int r = di.read();
    if (r<0) {
        break;
    }
    ds.write(r);
}
ds.flush();
di.close();
ds.close();

long before = System.nanoTime();

public class mergeThr extends Thread {
public void run() { }

Thread t = new mergeThr(0, a.length, a, depth);
t.start();
t.join();

int x = Integer.MIN_VALUE;

Collections.sort(lines, (String p1, String p2) -> {
    if("-l".equals(args[0])) {
        return p1.compareTo(p2);
    } else {
        return p2.compareTo(p1);
    }
});

public class ClientThread extends Thread {
ClientThread(Socket socket) throws IOException {
    this.socket = socket;
}
public void run() {
    synchronized(ClientThread.class) {
        Reader re = new InputStreamReader(socket.getInputStream());
        BufferedReader br = new BufferedReader(re);
        this.out = new PrintWriter(new OutputStreamWriter(socket.getOutputStream()), true);
        while (true) {
            String arg = br.readLine();
            out.println("ahoj");
        }
    }
}

ServerSocket s = new ServerSocket(6666);
s.setReuseAddress(true);
while(true) {
    try {
        Socket socket = s.accept();
        Thread t = new ClientThread(socket);
        t.start();
    } catch (Exception e) {
        System.out.println("cannot accept");
        break;
    }
}

InetAddress addr = InetAddress.getByName("localhost");
try (Socket socket = new Socket(addr, 6666)) {
    Reader re = new InputStreamReader(socket.getInputStream());
    BufferedReader br = new BufferedReader(re);
    PrintWriter out = new PrintWriter(new OutputStreamWriter(socket.getOutputStream()), true);
}

String l = br.readLine();
out.println("-d");

Character.isWhitespace((char) c)

String[] a; a.length;

ArrayList<String> exp = new ArrayList<>();
exp.add("foo");
int j = exp.size();
exp.remove(exp.size()-1); // remove last

inkedList<Double> numstack = new LinkedList<>();
peek() = pop(), push(), size()

HashMap<String, Double> mapa = new HashMap<>();
mapa.put("last", 1.2);
mapa.containsKey(k);
mapa.get(k);