Perform Binary Search on ArrayList : Collections « Collections « Java Tutorial

1. Java Tutorial
2. Collections
3. Collections

import java.util.ArrayList;
import java.util.Collections;

public class Main {
  public static void main(String[] args) {
    ArrayList<String> arrayList = new ArrayList<String>();

    arrayList.add("1");
    arrayList.add("4");
    arrayList.add("2");
    arrayList.add("5");
    arrayList.add("3");

    Collections.sort(arrayList);
    System.out.println("Sorted ArrayList contains : " + arrayList);
    int index = Collections.binarySearch(arrayList, "4");
    System.out.println("Element found at : " + index);
  }
}