Lists, LinkedLists and ListIterators. - Java Collection Framework

Java examples for Collection Framework:List

  1. HOME
  2. Java
  3. Collection Framework
  4. List

Description

Lists, LinkedLists and ListIterators.

Demo Code

import java.util.LinkedList;
import java.util.List;
import java.util.ListIterator;

public class Main {
  public static void main(String[] args) {
    // add colors elements to list1
    String[] colors = { "black", "yellow", "green", "blue", "violet", "silver" };
    List<String> list1 = new LinkedList<>();

    for (String color : colors)
      list1.add(color);//from   w ww  .ja v a2 s.  c  o m

    // add colors2 elements to list2
    String[] colors2 = { "gold", "white", "brown", "blue", "gray", "silver" };
    List<String> list2 = new LinkedList<>();

    for (String color : colors2)
      list2.add(color);

    list1.addAll(list2); // concatenate lists
    list2 = null; // release resources
    printList(list1); // print list1 elements

    convertToUppercaseStrings(list1); // convert to uppercase string
    printList(list1); // print list1 elements

    System.out.printf("%nDeleting elements 4 to 6...");
    removeItems(list1, 4, 7); // remove items 4-6 from list
    printList(list1); // print list1 elements
  }

  // output List contents
  private static void printList(List<String> list) {
    System.out.printf("%nlist:%n");

    for (String color : list)
      System.out.printf("%s ", color);

    System.out.println();
  }

  // locate String objects and convert to uppercase
  private static void convertToUppercaseStrings(List<String> list) {
    ListIterator<String> iterator = list.listIterator();

    while (iterator.hasNext()) {
      String color = iterator.next(); // get item
      iterator.set(color.toUpperCase()); // convert to upper case
    }
  }

  // obtain sublist and use clear method to delete sublist items
  private static void removeItems(List<String> list, int start, int end) {
    list.subList(start, end).clear(); // remove items
  }
}

Result


Related Tutorials