Answers for "arraylist java implementation"

15

java arraylist

import java.util.List; //list abstract class
import java.util.ArrayList; //arraylist class

//Object Lists
List l = new ArrayList();
ArrayList a = new ArrayList();

//Specialized List
List<String> l = new ArrayList<String>();
ArrayList<Integer> a = new ArrayList<Integer>();
//only reference data types allowed in brackets <>

//Initial Capacity
List<Double> l = new ArrayList<Double>(5);
//list will start with a capacity of 5
//saves allocation times
Posted by: Guest on July-13-2020
9

arraylist in java

import java.util.ArrayList;
public class ArrayListExample
{
   public static void main(String[] args)
   {
      int num = 14;
      // declaring ArrayList with initial size num
      ArrayList<Integer> al = new ArrayList<Integer>(num);
      // append new element at the end of list
      for(int a = 1; a <= num; a++)
      {
         al.add(a);
      }
      System.out.println(al);
      // remove element at index 7
      al.remove(7);
      // print ArrayList after deletion
      System.out.println(al);
      // print elements one by one
      for(int a = 0; a < al.size(); a++)
      {
         System.out.print(al.get(a) + " ");
      }
   }
}
Posted by: Guest on October-23-2020
3

arraylist methods in java

// Assign to list variable directly with STREAM FILTER METHID
ArrayList<String> filteredColors = (ArrayList<String>) colors.stream().filter(x -> x.contains("o")).collect(Collectors.toList());

// Clone and remove unwanted(TRADITIONAL FILTERING)
filteredColors = (ArrayList<String>) colors.clone();
filteredColors.removeIf(x -> !x.contains("o"));

// Find specific element
colors.stream().filter(x -> x.contains("ora")).findFirst().get();
Posted by: Guest on June-04-2021
1

arraylist in java

Size is dynamic
Only supports objects
not syncronized
array based class
Posted by: Guest on January-05-2021

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