How to Get Maximum Element of Java ArrayList

In this example we will show how to find a maximum element of java ArrayList with max method of Collections class.

Source Code

1)

package com.beginner.examples;

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

public class FindMaxElementOfArrayList1 {

	public static void main(String[] args) {

		ArrayList al = new ArrayList();

		al.add(6);
		al.add(3);
		al.add(5);
		al.add(9);
		al.add(8);
		
		// Use the sort() method in the Collections utility class to sort from
		// smallest to largest
		Collections.sort(al);
		
		//Gets the element of the last index
		//This element right here is the largest element
		Integer max = al.get(al.size() - 1);

		System.out.println("Max:"+max);

	}

}

Output:

Max:9

2)

package com.beginner.examples;

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

public class FindMaxElementOfArrayList2 {

	public static void main(String[] args) {

		ArrayList al = new ArrayList();

		al.add(6);
		al.add(3);
		al.add(5);
		al.add(9);
		al.add(8);
		
		// Use the Max () method in the Collections class to get the largest
		// element
		Integer max = Collections.max(al);

		System.out.println("Max:" + max);

	}

}

Output:

Max:9

References

Imported packages in Java documentation:

• ArrayList
• Collections
• Collection