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Search an element of Java ArrayList Example

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instanceof java

Posts: 576
Nickname: instanceof
Registered: Jan, 2015

instanceof java is a java related one.
Search an element of Java ArrayList Example Posted: Mar 9, 2016 9:41 AM
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1.Basic java Example program to search an element  ArrayList.

  1. package com.instanceofjavaforus;
  2. import java.util.ArrayList;
  3.  
  4. public class SearchArrayList{
  5.  
  6. public static void main(String[] args) {
  7.   
  8. //create an ArrayList object
  9.  ArrayList<Integer> arrayList = new ArrayList<Integer>();
  10.        
  11.         //Add elements to Arraylist
  12.         arrayList.add(1);
  13.         arrayList.add(2);
  14.         arrayList.add(3);
  15.         arrayList.add(4);
  16.         arrayList.add(5);
  17.         arrayList.add(6);
  18.         arrayList.add(7);
  19.         arrayList.add(8);
  20.         arrayList.add(9);
  21.         arrayList.add(10);
  22.         
  23.  /*
  24.  To check whether the specified element exists in Java ArrayList use
  25. boolean contains(Object element) method.
  26. It returns true if the ArrayList contains the specified object, false
  27. otherwise.*/
  28.        
  29.         boolean isFound = arrayList.contains(2);
  30.         System.out.println("Does arrayList contain 2 ? " + isFound);
  31.      
  32.   /*
  33.    To get an index of specified element in ArrayList use
  34.    int indexOf(Object element) method.
  35.    This method returns the index of the specified element in ArrayList.
  36.    It returns -1 if not found.
  37.   */
  38.    
  39.    int index = arrayList.indexOf(11);
  40.  
  41.  if(index == -1)
  42.     System.out.println("ArrayList does not contain 11");
  43.   else
  44.     System.out.println("ArrayList contains 4 at index :" + index);
  45.         
  46.         
  47.    int secindex = arrayList.indexOf(5);
  48.  
  49.  if(secindex== -1)
  50.       System.out.println("ArrayList does not contain 5");
  51.  else
  52.      System.out.println("ArrayList contains 5 at index :" + secindex);
  53.        
  54.  System.out.println("Size of ArrayList: "+ arrayList.size()); 
  55.  
  56.  Iterator itr=arrayList.iterator();
  57.  
  58. while (itr.hasNext()) {
  59.  
  60.  System.out.println(itr.next());
  61.  
  62.  }
  63.   
  64. }
  65. }
     

Output:

  1. Does arrayList contain 2 ? true
  2. ArrayList does not contain 11
  3. ArrayList contains 5 at index :4
  4. Size of ArrayList: 10
  5. 1
  6. 2
  7. 3
  8. 4
  9. 5
  10. 6
  11. 7
  12. 8
  13. 9
  14. 10

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