Vector v = new Vector(); // NE

Vector<Integer> v = new Vector<Integer>();
Vector<String> v = new Vector<String>();

Vector<String> v = new Vector<>();

Vector<String> v = new Vector();    // NE



v = Vector();
v.add(6);


Vector<Integer>
Vector<int>     // NE



Hashtable<String, String> clothesToColour
Hashtable<String, String> clothes2Colour

myHash.put("furcsa", null); // NE



Hashtable<Integer, Vector<String>> h
Vector<String> v = h.get(421);
String s = v.get(0);
s.charAt(35);


Hashtable h
Vector v = (Vector)h.get(421);
String s = (String)v.get(0);
s.charAt(35);


423
3245L
3542.0
3542.0f
"fgds"

{ "abc" => "xyz", "x" => "z" }      // nem Java



new List<>();
Arrays.asList(new Double[]{53,325, 12,5123,-251,3452});


Map<String, List<Double>> m = new HashMap<>();
m.put("bsasd", new List<>());
m.put("bsasd", new List<>());


new Integer(4623).compareTo(new Integer(2346)) ---> poz
new Integer(4623).compareTo(new Integer(4623)) ---> 0
new Integer(4623).compareTo(new Integer(9999)) ---> neg



class Sajat implements Comparable<Sajat>
{
    public int compareTo(Sajat s) {
        ....
    }

}


class HosszHasonlito implements Comparator<String> {
    public int compare(String s1, String s2) {
        return s1.length() - s2.length();
    }
}


HosszHasonlito hosszHasonl = new HosszHasonlito();
hosszHasonl.compare("abc", "xyz");  // 0, egyenlőek
hosszHasonl.compare("abcefg", "xyz");  // 3, az első nagyobb



Arrays.sort(args);
Arrays.sort(args, new HosszHasonlito());

1 10 2
1 2 10