Java Collections max() Method

The max() is a Java Collections class method which returns the maximum value for the given inputs. All elements in the collection must implement the Comparable interface. There is two different types of Java max() method which can be differentiated depending on its parameter. These are:

Java Collections max(coll) Method
Java Collections min(coll, comp) Method

Java Collections max(coll) Method

The max() method of Java Collections class is used to get the maximum element of the given collection, according to the natural ordering of its elements.

Java Collections max(coll, comp) Method

The max() method of Java Collections class is used to get the maximum element of the given collection, according to the order induced by the specified comparator.

Syntax

Following is the declaration of max() method:

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

public static <T> T max(Collection<? extends T> coll, Comparator<? super T> comp)

Parameter

Parameter	Description	Required/Optional
coll	It is the collection whose maximum element is to be determined.	Required
comp	It is the comparator with which we determine the maximum element.	Required

Returns

Method	Returns
max(Collection<? extends T> coll)	It returns the maximum element of the given collection, according to the natural ordering of its elements.
max(Collection<? extends T> coll, Comparator<? super T> comp)	It returns the maximum element of the given collection, according to the order of the specified comparable.

Exceptions

The max() method throws the following exceptions-

ClassCastException- It throws this exception if the collection contains elements that are not mutually comparable (for example, strings and integers).

NoSuchElementException- It throws this exception if the collection is empty.

Compatibility Version

Java 1.4 and above

Example 1

import java.util.*;
public class CollectionsMaxExample1 {
	public static void main(String[] args) {
		//Create collection    
	      List<String> list = new ArrayList<String>();	      
	      //Add values in the list
	      list.add("A");
	      list.add("B");
	      list.add("E");
	      list.add("C");
	      list.add("S");	    	      
	      //Comparing using order of the specified comparable
	      System.out.println("Max val: " + Collections.max(list,null)); 
	      }
}

Test it Now

Output:

Max val: S

Example 2

import java.util.*;
public class CollectionsMaxExample2 {
	public static void main(String[] args) {
		//Create collections lists  
		List<Integer> list = Arrays.asList(20, 10, 100, 140, 250);
            Integer max = Collections.max(list);
            System.out.println("Maximum element is: "+max);
	      }
}

Test it Now

Output:

Maximum element is: 250

Example 3

import java.util.*;
public class CollectionsMaxExample3 {
	public static void main(String[] args) {
		//Create collections lists  
		List<Integer> list = Arrays.asList(201, 101, 1001, 140, 2501);
            //Comparing using order of the specified comparable
            Integer max = Collections.max(list, Collections.reverseOrder());
            System.out.println("Output: "+max);
	      }
}	

Test it Now

Output:

Output: 101

Example 4

import java.util.*;
public class CollectionsMaxExample4 {
	public static void main(String[] args) {
		//Create collection    
	      List<String> list = new ArrayList<String>();	      
	      //Add values in the list
	      list.add("Java");
	      list.add("COBOL");
	      list.add("PHP");
	      list.add("Ruby");
	      list.add("XML");	    	      
	      //Comparing using natural ordering
	      System.out.println("Maximum Element is: " + Collections.max(list));
	      List<Integer> iList = Arrays.asList(-20, -10, -100, -140, -250);
            Integer max = Collections.max(iList);
            System.out.println("Maximum Value is: "+max);	      
	      }
}	

Test it Now

Output:

Maximum Element is: XML
Maximum Value is: -10

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Java Collections max() Method

Java Collections max(coll) Method

Java Collections max(coll, comp) Method

Syntax

Parameter

Returns

Exceptions

Compatibility Version

Example 1