how to create a list in java
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
class scratch{
public static void main(String[] args) {
List<Integer> aList = new ArrayList<>();
List<Integer> lList = new LinkedList<>();
}
}list in java
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.ListIterator;
public class Main {
public static void main(String[] args) {
List<String> list = new ArrayList<String>();
list.add("a");
list.add("b");
list.add("c");
list.add("d");
list.add("e");
list.add("f");
//On met la liste dans le désordre
Collections.shuffle(list);
System.out.println(list);
//On la remet dans l'ordre
Collections.sort(list);
System.out.println(list);
Collections.rotate(list, -1);
System.out.println(list);
//On récupère une sous-liste
List<String> sub = list.subList(2, 5);
System.out.println(sub);
Collections.reverse(sub);
System.out.println(sub);
//On récupère un ListIterator
ListIterator<String> it = list.listIterator();
while(it.hasNext()){
String str = it.next();
if(str.equals("d"))
it.set("z");
}
while(it.hasPrevious())
System.out.print(it.previous());
}
}java list to set
Set<Foo> foo = new HashSet<Foo>(myList);java api add
boolean add(E e)
Appends the specified element to the end of this list (optional operation).
Lists that support this operation may place limitations on what elements may be added to this list. In particular, some lists will refuse to add null elements, and others will impose restrictions on the type of elements that may be added. List classes should clearly specify in their documentation any restrictions on what elements may be added.
Specified by:
add in interface Collection<E>
Parameters:
e - element to be appended to this list
Returns:
true (as specified by Collection.add(E))
Throws:
UnsupportedOperationException - if the add operation is not supported by this list
ClassCastException - if the class of the specified element prevents it from being added to this list
NullPointerException - if the specified element is null and this list does not permit null elements
IllegalArgumentException - if some property of this element prevents it from being added to this listlist of lists java
List<ArrayList<String>> listOfLists = new ArrayList<ArrayList<String>>();java list
import java.util.*;
var list = new ArrayList<String>();
list.add("Hello World!");Copyright © 2021 Codeinu
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