Java Collections - max() Method

The java.util.Collections.max() method returns the maximum element of the given collection, according to the natural ordering of its elements.

Syntax

public static <T extends Object & Comparable<? super T>> 
              T max(Collection<? extends T> coll)

Here, T is the type of element in the collection.

Parameters

Return Value

Return the maximum element of the given collection, according to the natural ordering of its elements.

Exception

• Throws ClassCastException, if the collection contains elements that are not mutually comparable (for example, strings and integers).
• Throws NoSuchElementException, if the collection is empty.

Example:

In the example below, the java.util.Collections.max() method is used to find the maximum element in a given collection according to the natural ordering of its elements.

import java.util.*;

public class MyClass {
  public static void main(String[] args) {
    //creating a list object
    List<Integer> MyList = new ArrayList<Integer>();

    //populating MyList
    MyList.add(10);
    MyList.add(20);
    MyList.add(-30);
    MyList.add(-40);
    MyList.add(100);

    //printing the list
    System.out.println("MyList contains: " + MyList);  

    //finding maximum element in the list
    int retval = Collections.max(MyList);
    System.out.println("Maximum element in MyList: " + retval); 
  }
}

The output of the above code will be:

MyList contains: [10, 20, -30, -40, 100]
Maximum element in MyList: 100