/*
Search an element of Java ArrayList Example
This Java Example shows how to search an element of java
ArrayList object using contains, indexOf and lastIndexOf methods.
*/
import java.util.ArrayList;
public class SearchAnElementInArrayListExample {
public static void main(String[] args) {
//create an ArrayList object
ArrayList arrayList = new ArrayList();
//Add elements to Arraylist
arrayList.add("1");
arrayList.add("2");
arrayList.add("3");
arrayList.add("4");
arrayList.add("5");
arrayList.add("1");
arrayList.add("2");
/*
To check whether the specified element exists in Java ArrayList use
boolean contains(Object element) method.
It returns true if the ArrayList contains the specified objct, false
otherwise.
*/
boolean blnFound = arrayList.contains("2");
System.out.println("Does arrayList contain 2 ? " + blnFound);
/*
To get an index of specified element in ArrayList use
int indexOf(Object element) method.
This method returns the index of the specified element in ArrayList.
It returns -1 if not found.
*/
int index = arrayList.indexOf("4");
if(index == -1)
System.out.println("ArrayList does not contain 4");
else
System.out.println("ArrayList contains 4 at index :" + index);
/*
To get last index of specified element in ArrayList use
int lastIndexOf(Object element) method.
This method returns index of the last occurrence of the
specified element in ArrayList. It returns -1 if not found.
*/
int lastIndex = arrayList.lastIndexOf("1");
if(lastIndex == -1)
System.out.println("ArrayList does not contain 1");
else
System.out.println("Last occurrence of 1 in ArrayList is at index :" + lastIndex);
}
}
/*
Output would be
Does arrayList contain 2 ? true
ArrayList contains 4 at index :3
Last occurrence of 1 in ArrayList is at index :5
*/
