Search an element of Java ArrayList Example

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