Check element for existance for List - Java Collection Framework

Java examples for Collection Framework:List

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Description

Check element for existance for List

Demo Code

import java.util.ArrayList;

public class Main
{
   public static void main(String[] args)
   {//from  w ww  .  ja va2s. c  om
      // create a new ArrayList of Strings with an initial capacity of 10
      ArrayList<String> items = new ArrayList<String>(); 

      items.add("red"); // append an item to the list          
      items.add(0, "yellow"); // insert "yellow" at index 0

      // check if a value is in the List
      System.out.printf("\"red\" is %sin the list%n",
         items.contains("red") ? "": "not ");

      // display number of elements in the List
      System.out.printf("Size: %s%n", items.size());

      items.remove(1); // remove item at index 1
      display(items, "Remove second list element (green):"); 

      // check if a value is in the List
      System.out.printf("\"red\" is %sin the list%n",
         items.contains("red") ? "": "not ");

      // display number of elements in the List
      System.out.printf("Size: %s%n", items.size());
   } 

   // display the ArrayList's elements on the console
   public static void display(ArrayList<String> items, String header)
   {
      System.out.print(header); // display header

      // display each element in items
      for (String item : items)
         System.out.printf(" %s", item);

      System.out.println();
   } 
}

Result


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