Question : list of lists java
Answered by : manuel-barril-rodrguezarana
import java.util.ArrayList;
import java.util.List;
public class main { public static void main(String[] args){ List<List<Integer>> lists = new ArrayList<List<Integer>>(); List<Integer> num1 = Arrays.asList(new Integer[] {1,2,3,4}); List<Integer> num2 = Arrays.asList(new Integer[] {7,9,3,4}); lists.add(num1); lists.add(num2); System.out.println(lists); }
}
Source : https://www.techiedelight.com/initialize-list-of-lists-java/ | Last Update : Tue, 19 Jul 22
Question : how to make java list
Answered by : eero-vkiparta
//Creating arraylist example
ArrayList<String> list = new ArrayList<String>();
//Adding objects in arraylist
list.add("Mango");
list.add("Banana");
//Change the element (index,"new value")
list.set(1,"Dates");
//Return the 2nd element, because index starts from 0
System.out.println("Returning element: " + list.get(1));
Source : https://www.javatpoint.com/java-arraylist | Last Update : Mon, 02 Nov 20
Question : Java List
Answered by : mrmike
// Java Program to illustrate the
// addition of elements in a List
import java.util.*;
public class GFG {
public static void main(String args[])
{
// Creating a List
List<String> al = new ArrayList<>();
// Adding elements in the List
al.add("mango");
al.add("orange");
al.add("Grapes");
// Iterating the List
// element using for-each loop
for (String fruit : al)
System.out.println(fruit);
}
}
Source : https://www.geeksforgeeks.org/difference-between-list-set-and-map-in-java/ | Last Update : Sat, 02 Jul 22
Question : Java How to use List?
Answered by : samer-saeid
// ArrayList implementation of List
List<String> list1 = new ArrayList<>();
// LinkedList implementation of List
List<String> list2 = new LinkedList<>();
Source : | Last Update : Wed, 01 Jun 22
Question : list of java
Answered by : arno
var list1 = List.of(1, 2);
var list2 = new ArrayList<>(List.of(3, 4));
var list3 = new ArrayList<String>();
Source : https://stackoverflow.com/questions/858572/how-to-make-a-new-list-in-java | Last Update : Sun, 13 Feb 22
Question : list of list in java
Answered by : pankaj-kumar-prasad
// Java code to demonstrate the concept of
// list of lists using iterator
import java.util.*;
class List_of_list {
// Iterate the 2D list using Iterator
// and print each element
public static <K> void
iterateUsingIterator(List<List<K> > listOfLists)
{
// Iterator for the 2D list
Iterator listOfListsIterator
= listOfLists.iterator();
System.out.println("[");
while (listOfListsIterator.hasNext()) {
// Type cast next() method
// to convert from Object to List<K>
List<K> list = new ArrayList<K>();
list = (List<K>)listOfListsIterator.next();
// Iterator for list
Iterator eachListIterator
= list.iterator();
System.out.print(" [");
while (eachListIterator.hasNext()) {
System.out.print(
" "
+ eachListIterator.next()
+ ", ");
}
System.out.println("], ");
}
System.out.println("]");
}
// Driver code
public static void main(String[] args)
{
// List of Lists
ArrayList<List<Integer> > listOfLists
= new ArrayList<List<Integer> >();
// Create N lists one by one
// and append to the list of lists
List<Integer> list1
= new ArrayList<Integer>();
list1.add(5);
list1.add(10);
listOfLists.add(list1);
List<Integer> list2
= new ArrayList<Integer>();
list2.add(1);
listOfLists.add(list2);
List<Integer> list3
= new ArrayList<Integer>();
list3.add(20);
list3.add(30);
list3.add(40);
listOfLists.add(list3);
// Iterate the 2D list
iterateUsingIterator(listOfLists);
}
}
Source : https://www.geeksforgeeks.org/how-to-iterate-over-a-2d-list-or-list-of-lists-in-java/ | Last Update : Sun, 01 May 22