how to use addall() method of collections?

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i need to use it to merge two ordered list of objects.

Collections addAll() method in Java with Examples, The addAll(Collection collection) of java.util.Collection interface Below examples illustrate the Collection addAll() method: Example 1: Using LinkedList Class. The addAll(Collection<? super T>, T..) method is used to add all of the specified elements to the specified collection. Declaration Following is the declaration for java.util.Collections.addAll() method.

Collection all = new HashList();
all.addAll(list1);
all.addAll(list2);

Collection addAll() method in Java with Examples, method is used to add all of the specified elements to the specified collection. The following example shows the usage of java.util.Collections.addAll(). Collections addAll () method in Java with Examples. The addAll() method of java.util.Collections class is used to add all of the specified elements to the specified collection. Elements to be added may be specified individually or as an array. The behavior of this convenience method is identical to that of c.addAll(Arrays.asList(elements)),

I m coding some android, and i found this to be extremely short and handy:

    card1 = (ImageView)findViewById(R.id.card1);
    card2 = (ImageView)findViewById(R.id.card2);
    card3 = (ImageView)findViewById(R.id.card3);
    card4 = (ImageView)findViewById(R.id.card4);
    card5 = (ImageView)findViewById(R.id.card5);

    card_list = new ArrayList<>();
    card_list.addAll(Arrays.asList(card1,card2,card3,card4,card5));

Versus this standard way i used to employ:

    card1 = (ImageView)findViewById(R.id.card1);
    card2 = (ImageView)findViewById(R.id.card2);
    card3 = (ImageView)findViewById(R.id.card3);
    card4 = (ImageView)findViewById(R.id.card4);
    card5 = (ImageView)findViewById(R.id.card5);

    card_list = new ArrayList<>();
    card_list.add(card1) ;
    card_list.add(card2) ;
    card_list.add(card3) ;
    card_list.add(card4) ;
    card_list.add(card5) ;

java.util.Collections.addAll() Method, how to use addall() method of collections? java list collections merge. i need to use it to merge two ordered list of objects. share. addAll() method first ensures that there is sufficient space in the arraylist. If list does not have space, then it grows the list by adding more spaces in underlying array. Then it append the elements to end of the list. Method parameter – collection containing elements to be added to this list.

how to use addall() method of collections?, ArrayList addAll() method is used to append all of the elements of argument to add all elements of a given collection to the arraylist using addAll() method. The following are Jave code examples for showing how to use addAll() of the java.util.Collections class. You can vote up the examples you like. Your votes will be used in our system to get more good examples.

ArrayList addAll() method example, In this tutorial we will see the usage of addAll() method of java.util.ArrayList class . This method is used for adding all the elements of a list to the another list. Collections.addAll() method adds all of the specified elements to the specified collection. Elements to be added may be specified individually or as an array. The behavior of this convenience method is identical to that of c.addAll(Arrays.asList(elements)), but this method is likely to run significantly faster under most implementations.

Java ArrayList addAll(Collection c) Method example, The methods of this class all throw a NullPointerException if the collections or class objects provided to them Searches the specified list for the specified object using the binary search algorithm. Since: 1.3; See Also: emptyMap() The addAll method is implemented as a sequence of put invocations on the backing map. In this tutorial we will see the usage of addAll() method of java.util.ArrayList class. This method is used for adding all the elements of a list to the another list. This method is used for adding all the elements of a list to the another list.

Comments
  • What do you mean by merge? What are you trying to do?
  • There are libraries that provide int[] <-> Integer[] conversion, or you can use Guava's Ints.asList(int...) with addAll to a List<Integer>, etc. I can elaborate on these points if this is what OP wants to do.
  • This is telling me for List<String> : The type List is not generic; it cannot be parameterized with arguments <String>
  • is it that addAll cannot be applied to int[]?
  • @bhavna: Not according to the signature in the API docs, no: java.sun.com/javase/6/docs/api/java/util/…
  • I would write: "card_list.add(card1 = (ImageView)findViewById(R.id.card1));" if I really need the variables and not just the list.