Search an element of Java ArrayList

package org.best.example;
   
    /*
      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
    */