How to search user defined object from a List by using binary search using comparator?

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The java.util.Collections class consists exclusively of static methods that operate on or return collections. It contains polymorphic algorithms that operate on collections, “wrappers”, which return a new collection backed by a specified collection, and a few other odds and ends.

Collections.binarySearch() method will searches the specified list for the specified object using the binary search algorithm.

Example

package com.w3schools;
 
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List; 
 
public class Test {
    public static void main(String args[]){
                List list = new ArrayList();
                list.add("ajay");
                list.add("amit");
                list.add("vikas");
                list.add("anil");
                int index = Collections.binarySearch(list,"vikas");
                System.out.println("Index : "+index);
    }
}

Output

Index : 2

Java Collections class examples