Java Program to Get Minimum and Maximum From a List

In this article, we will understand how to get minimum and maximum from a list. A list is an ordered collection that allows us to store and access elements sequentially. It contains the index-based methods to insert, update, delete and search the elements. It can also have duplicate elements.

Below is a demonstration of the same −

Suppose our input is −

Input list: [500, 650, 300, 250, 110]

The desired output would be −

The minimum value of the list is: 110
The maximum value of the list is: 650

Algorithm

Step 1 - START
Step 2 - Declare a list namely input_list.
Step 3 - Define the values.
Step 4 - Sort the list using the inbuilt function .sort().
Step 5 - Use the inbuilt function Integer.MAX_VALUE to fetch the max value of the list and Integer.MIN_VALUE to fetch the minimum value of the list.
Step 6 - Display the result
Step 7 - Stop

Example 1

Here, we bind all the operations together under the ‘main’ function.

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

public class Demo {
   public static void main(String[] args) {
      System.out.println("Required packages have been imported");
      List<Integer> input_list = new ArrayList<>();
      input_list.add(500);
      input_list.add(650);
      input_list.add(300);
      input_list.add(250);
      input_list.add(110);
      System.out.println("The list is defined as " +input_list);
      List<Integer> sortedlist = new ArrayList<>(input_list);
      Collections.sort(sortedlist);
      if (sortedlist == null || sortedlist.size() == 0) {
         System.out.println("\nThe minimum value of the list is: " +Integer.MAX_VALUE);
      }
      System.out.println("\nThe minimum value of the list is: " +sortedlist.get(0));
      if (sortedlist == null || sortedlist.size() == 0) {
         System.out.println("The maximum value of the list is: " + Integer.MIN_VALUE);
         return ;
      }
      int list_size = sortedlist.size() - 1;
      System.out.println("The maximum value of the list is: " + sortedlist.get(list_size));
   }
}

Output

Required packages have been imported
The list is defined as [500, 650, 300, 250, 110]

The minimum value of the list is: 110
The maximum value of the list is: 650

Example 2

Here, we encapsulate the operations into functions exhibiting object-oriented programming.

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
public class Demo {
   public static Integer get_min_value(List<Integer> sortedlist) {
      if (sortedlist == null || sortedlist.size() == 0) {
         return Integer.MAX_VALUE;
      }
      return sortedlist.get(0);
   }
   public static Integer get_max_value(List<Integer> sortedlist) {
      if (sortedlist == null || sortedlist.size() == 0) {
         return Integer.MIN_VALUE;
      }
      int list_size = sortedlist.size() - 1;
      return sortedlist.get(list_size);
   }
   public static void main(String[] args) {
      System.out.println("Required packages have been imported");
      List<Integer> input_list = new ArrayList<>();
      input_list.add(500);
      input_list.add(650);
      input_list.add(300);
      input_list.add(250);
      input_list.add(110);
      System.out.println("The list is defined as " +input_list);
      List<Integer> sortedlist = new ArrayList<>(input_list);
      Collections.sort(sortedlist);
      System.out.println("\nThe minimum value of the list is: " + get_min_value(sortedlist));
      System.out.println("The maximum value of the list is: " + get_max_value(sortedlist));
   }
}

Output

Required packages have been imported
The list is defined as [500, 650, 300, 250, 110]

The minimum value of the list is: 110
The maximum value of the list is: 650