set















  1. Set interface can be used for representing a group of Individual objects where insertion order is not preserved and duplicate objects are not allowed.
  2. Set interface is child interface of Collection.
  3. This interface doesn’t contain any new method and we have to use only collection Interface methods.

forex växla pris classes of Set interface

  1. HashSet
  2. LinkedHashSet
  3. TreeSet
  4. These are the classes which implements Set interface directly or indirectly.

HashSet

  1. The underlying Data Structure for HashSet is Hashtable.
  2. Insertion order is not preserved and it is based on has code of the Object.
  3. Duplicate objects are not allowed. Violation leads to no CompileTimeError and RuntimeError, add() method simply returns false.
  4. Heterogeneous objects are allowed and ‘null’ insertion is possible.
  5. HashSet is the best choice if the frequent operation is Search Operation.
  6. HashSet implements Serializable and Cloneable

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Constructor Description
HashSet h = new HashSet() Creates an empty HashSet object with default initial capacity 16 and default fill ratio 0.75
HashSet h = new HashSet(int initialcapacity) Constructs a new, empty set; the backing HashMap instance has the specified initial capacity and default load factor (0.75).
HashSet h = new HashSet(int initialCapacity, float fillratio) Constructs a new, empty set; the backing HashMap instance has the specified initial capacity and the specified load factor.
HashSet h = new HashSet(Collection c) Constructs a new set containing the elements in the specified collection.

بنك الانماء اسهم Example:

import java.util.HashSet;
class HashSetDemo {
	public static void main(String arg[]) {
		HashSet h = new HashSet();
		h.add("C");
		h.add("C++");
		h.add("JAVA");
		h.add("PHP");
		h.add(null);
		h.add(new Integer(10));
		System.out.println(h.add("PHP"));
		System.out.println(h);
	}
}
/*output:
false
[null, PHP, C, 10, JAVA, C++]
*/

LinkedHashSet

It is the child class of HashSet. It is Exactly similar as HashSet. Except the following differences.
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HashSet LinkedHashSet
The underlying Data Structure is Hashtable The underlying Data Structure is a combination of Hashtable and LinkedList
Insertion Order is not preserved Insertion Order is preserved.
Introduced in 1.2 version Introduced in 1.4 version

http://www.seattleconcretelab.com/?o=%D8%AA%D8%AC%D8%A7%D8%B1%D9%87-%D8%A7%D9%84%D8%B0%D9%87%D8%A8-%D9%88%D8%A7%D9%84%D8%B9%D9%85%D9%84%D8%A7%D8%AA&cd3=a8 تجاره الذهب والعملات Example:

import java.util.LinkedHashSet;
public class LinkedHashSetDemo {
     public static void main(String[] args) {
		LinkedHashSet h = new LinkedHashSet();
		h.add("C");
		h.add("C++");
		h.add("JAVA");
		h.add("PHP");
		h.add(null);
		h.add(new Integer(10));
		System.out.println(h.add("PHP"));
		System.out.println(h);
	}
}
/*Output:
false
[C, C++, JAVA, PHP, null, 10]
*/

http://wiretech-hk.com/?inna=%D8%B4%D8%B1%D8%AD-%D8%B5%D9%88%D8%AA%D9%8A-%D8%B9%D9%86-%D9%85%D8%A4%D8%B4%D8%B1%D8%A7%D8%AA-%D8%A7%D9%84%D8%A7-%D8%B3%D9%87%D9%85-%D8%A7%D9%84%D8%B3%D8%B9%D9%88%D8%AF%D9%8A%D9%87&a5c=b9 شرح صوتي عن مؤشرات الا سهم السعوديه Note: LinkedHashSet and LinkedHashMap are best suitable to implement cache applications.because in these applications insertion order must be preserved and duplicate objects are not allowed.

SortedSet

  1. This can be used for representing a group of individual objects where duplicate objects are not allowed.
  2. Insertion order is not preserved but all the elements are inserted according to some sorting order of elements.
  3. The sorting order may be default natural sorting order or customized sorting order.

تجارة نت الذهب The SortedSet Interface definesthe following more specific methods

  1. Object first()
    Returns first element in the SortedSet
  2. Object last()
  3. SortedSet headSet(Object obj)
    Returns the SortedSet contains the elements which are less than object obj.
  4. SortedSet tailSet(Object obj)
    Returns the SortedSet whose elements are greater than or equal to object obj
  5. SortedSet subSet(Object obj1, Object obj2)
    Returns the SortedSet whose elements are >= obj1 but < Obj2
  6. Comparator comparator();
    Returns the comparator object describes the underlying sorting technique.

    If you are using default(Ascending) natural sorting order it returns null.

كيف يمكنني تداول الاسهم الامريكية Example

  1. 100
  2. 120
  3. 130
  4. 140
  5. 150
  6. 160

first(): 100
last() : 160
headSet(140) : {100,120,130}
tailSet(140): {140,150,160}
subset(130,150):{130,140}
comparator() : null

TreeSet

  1. The underlying Data structure for the TreeSet is Balanced tree.
  2. Duplicate objects are not allowed.
  3. Insertion order is not preserved but all the elements are inserted according to some sorting order.
  4. Heterogeneous objects are not allowed, violation leads to Run time error saying “ClassCastException”.

http://www.hfmobster.com/?kygyt=strategia-forex-infallibile&b24=21 strategia forex infallibile Constructors

Constructors Description
TreeSet t = new TreeSet(); Creates an empty TreeSet Object where the sorting order is default natural sorting order of the elements.
TreeSet t= new TreeSet(Comparator c) Creates an empty TreeSet Object where the Sorting order is specified by comparator object.
TreeSet t= new TreeSet(Collection c) Constructs a new tree set containing the elements in the specified collection, sorted according to the natural ordering of its elements.
TreeSet t= new TreeSet(SortedSet s) Creates TreeSet Object for a given SortedSet

توصيات فوركس Example:


import java.util.TreeSet;

class TreeSetDemo {
	public static void main(String arg[]) {
		TreeSet t = new TreeSet();
		t.add("A");
		t.add("B");
		t.add("Z");
		t.add("L");
		// t.add(new Integer(10)); //ClassCastException.
		// t.add(null); // NullPointerException.
		
		System.out.println(t);
	}
}
/*Output:
[A, B, L, Z]---->sorting order.
*/

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  1. For the empty TreeSet has the first element we are allowed to add null. But after inserting null if we are trying to insert any other element we will get NullPointerException.
  2. If the TreeSet already contains some elements if we are trying to insert null we will get NullPointerException.
  3. تجارة الفوريكس Example:

    import java.util.TreeSet;
    public class TreeSetWithSBDemo {
         public static void main(String[] args) {
    		TreeSet t = new TreeSet();
    		t.add(new StringBuffer("A"));
    		t.add(new StringBuffer("B"));
    		t.add(new StringBuffer("T"));
    		t.add(new StringBuffer("Z"));
    		System.out.println(t);
    	}
    }
    /* Output:
    Exception in thread "main"java.lang.ClassCastException: java.lang.StringBuffer cannot be cast to java.lang.Comparable
    	at java.util.TreeMap.put(TreeMap.java:542)
    	at java.util.TreeSet.add(TreeSet.java:238)
    	at com.java2learn.collections.TreeSetWithSBDemo.main(TreeSetWithSBDemo.java:9)
    */
    
  4. If we are depending on natural sorting order compulsory the objects should be “homogeneous and comparable” other wise we will get “ClassCastException.”
  5. An object is said to be comparable(if and only if) the corresponding class has to implement comparable interface.
  6. All metodo semplice forex wrapper classes and بنك الرياض تداول الاسهم String class already implemented http://www.ac-brno.org/?pycka=%D8%A7%D8%AE%D8%A8%D8%A7%D8%B1-%D8%AA%D8%AF%D8%A7%D9%88%D9%84-%D8%A7%D9%84%D8%A7%D8%B3%D9%87%D9%85-%D8%A7%D9%84%D8%B3%D8%B9%D9%88%D8%AF%D9%8A%D8%A9&896=41 اخبار تداول الاسهم السعودية comparable interface. But the forex megadroid erfahrungen StringBuffer doesn’t implement Comparable interface. Hence in the above program we got ClassCastException.