Find maximum in list java

Find Minimum Maximum value in ArrayList

Find Minimum Maximum value in ArrayList Java example shows how to find the minimum and maximum value in ArrayList. The example also shows how to find minimum maximum value along with index in Java ArrayList.

How to find the Minimum Maximum value in ArrayList?

There are a couple of ways to find minimum and maximum value in Java ArrayList.

1) Find Min Max value in ArrayList using Collections class

You can use min and max methods of Collections class.

This method returns the minimum element/value of the specified collection according to the natural ordering of the elements.

This method returns the maximum element/value of the specified collection according to the natural ordering of the elements.

How to find an index of minimum maximum elements in Java ArrayList?

If you want to find index of minimum or maximum element instead of value, you can use indexOf method of the ArrayList class.

This method returns the index of the specified element. If the element is not found in the ArrayList, it returns -1.

2) Find Min Max value in ArrayList using for loop

If you want to find min max values without using the Collections class, you can use for loop to find the same as given below.

Please let me know your views in the comments section below.

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2 comments

What if there are duplicate entries in the ArrayList.. like 5 times number 1 ? This code will find only the first occurrence of number 1 and will say that’s the minimum as its the only one.. How to find all the minimum indexes.

Hello Simon, Even if the ArrayList has duplicates, the minimum value above code finds remains the same. So if ArrayList has 5 times 1, the minimum value is still 1 regardless of the index and that was the purpose of the above code, to find the minimum value. However, if you want to find index of all the minimum elements, that can be easily done by changing the code a little bit. Once you get the minimum element, scan through the ArrayList and check what all indexes has the element. I hope this answers your question. Thanks.

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Find Max and Min Values of a List in Java

There are many ways to find the max and min values of a List in Java. We will explore the following:

Finding the maximum and minimum values of a List using the max() and min() methods from the Collections class

To return the maximum element of the given collection, we can use the max() method, and to return the minimum value, we can use the min() method of the Collections class from the java.util package.

public class Test < public static void main(String[] args) < Listlist = new ArrayList<>(Arrays.asList(7, 19, 14, 1, 12, 22, 18, 3, 28, 5)); System.out.println("Maximum value: " + Collections.max(list)); System.out.println("Minimum value: " + Collections.min(list)); > >

Finding the maximum and minimum values in List using the Java 8 Streams

We can use the min() and max() Stream operations that accept the Comparator to return the largest and smallest numbers from the list.

public class Test < public static void main(String[] args) < Listlist = new ArrayList<>(Arrays.asList(7, 19, 14, 1, 12, 22, 18, 3, 28, 5)); System.out.println("Maximum value: " + list.stream().max(Integer::compare).get()); System.out.println("Minimum value: " + list.stream().min(Integer::compare).get()); > >

Here, we called the get() method because both max() and min() methods return the Optional.

Finding the Largest and Smallest Numbers in List Using Iteration

We can find the max and min values using the for loop like in the following example:

public class Test < public static void main(String[] args) < Listlist = new ArrayList<>(Arrays.asList(7, 19, 14, 1, 12, 22, 18, 3, 28, 5)); System.out.println("Maximum value: " + getMax(list)); System.out.println("Minimum value: " + getMin(list)); > private static int getMax(List numbers) < int maximum = -1; for (Integer number : numbers) < if (number >maximum) < maximum = number; >> return maximum; > private static int getMin(List numbers) < int minimum = Integer.MAX_VALUE; for (Integer number : numbers) < if (number < minimum) < minimum = number; >> return minimum; > >

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Источник

Find Max and Min Values of a List in Java

There are many ways to find the max and min values of a List in Java. We will explore the following:

Finding the maximum and minimum values of a List using the max() and min() methods from the Collections class

To return the maximum element of the given collection, we can use the max() method, and to return the minimum value, we can use the min() method of the Collections class from the java.util package.

public class Test < public static void main(String[] args) < Listlist = new ArrayList<>(Arrays.asList(7, 19, 14, 1, 12, 22, 18, 3, 28, 5)); System.out.println("Maximum value: " + Collections.max(list)); System.out.println("Minimum value: " + Collections.min(list)); > >

Finding the maximum and minimum values in List using the Java 8 Streams

We can use the min() and max() Stream operations that accept the Comparator to return the largest and smallest numbers from the list.

public class Test < public static void main(String[] args) < Listlist = new ArrayList<>(Arrays.asList(7, 19, 14, 1, 12, 22, 18, 3, 28, 5)); System.out.println("Maximum value: " + list.stream().max(Integer::compare).get()); System.out.println("Minimum value: " + list.stream().min(Integer::compare).get()); > >

Here, we called the get() method because both max() and min() methods return the Optional.

Finding the Largest and Smallest Numbers in List Using Iteration

We can find the max and min values using the for loop like in the following example:

public class Test < public static void main(String[] args) < Listlist = new ArrayList<>(Arrays.asList(7, 19, 14, 1, 12, 22, 18, 3, 28, 5)); System.out.println("Maximum value: " + getMax(list)); System.out.println("Minimum value: " + getMin(list)); > private static int getMax(List numbers) < int maximum = -1; for (Integer number : numbers) < if (number >maximum) < maximum = number; >> return maximum; > private static int getMin(List numbers) < int minimum = Integer.MAX_VALUE; for (Integer number : numbers) < if (number < minimum) < minimum = number; >> return minimum; > >

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How To Find Maximum Value from ArrayList in Java — Collections.max()

A example program to find the maximum element from ArrayList. This is implemented in Java and finding max value. Finding max salary from Employee List with Collections.max().

1. Introduction

In this article, We’ll learn how to find the maximum (max) value from ArrayList. Finding the max value from ArrayList from Collection API is done by running a loop over all the elements or can be found max value with the Collections.max() method.

Collections.max(): Returns the maximum element of the given collection, according to the natural ordering of its elements.

Example programs to find the max value from a list of wrapper objects and a list of custom or user-defined objects.

2. Finding the max integer value from ArrayList

Create a list of integer values and pass the list to Collections.max(list). max() method sort the list of values in the natural order and return max value from it.

package com.java.w3schools.blog.arraylist; import java.util.ArrayList; import java.util.Collections; import java.util.List; /** * * Finding max value from list. * * @author javaprogramto.com * */ public class ArrayListMaxValue < public static void main(String[] args) < // creating list. ListintValues = new ArrayList<>(); // adding values intValues.add(6); intValues.add(64); intValues.add(45); intValues.add(60); intValues.add(9); intValues.add(2); // calling max() method. Integer max = Collections.max(intValues); System.out.println("ArrayList values : " + intValues); System.out.println("ArrayList max value : " + max); > >

ArrayList values : [6, 64, 45, 60, 9, 2] ArrayList max value : 64

3. Custom Objects — Find Max Salary Employee from list of Employee Objects

• First create an employee class with id, age and salary fields.
• Next, create a list of employee objects.
• Last, Call Collections.sort(listOfEmps) method that should return the Employee object with max salary.

package com.java.w3schools.blog.arraylist; import java.util.ArrayList; import java.util.Collections; import java.util.List; /** * * Find employee object with max salary. * * @author javaprogramto.com * */ public class ArrayListCustomObjectMaxValue < public static void main(String[] args) < // creating list with type Employee. ListempOfList = new ArrayList<>(); // adding values empOfList.add(new Employee(100, 45, 250000)); empOfList.add(new Employee(109, 38, 15000)); empOfList.add(new Employee(108, 23, 330000)); empOfList.add(new Employee(111, 55, 873983)); empOfList.add(new Employee(103, 25, 908022)); empOfList.add(new Employee(102, 35, 87272)); // calling max() method. Employee max = Collections.max(empOfList); System.out.println("ArrayList max value : " + max.getSalary() + " for emp id : " + max.getId()); > > class Employee implements Comparable  < private int id; private int age; private long salary; public Employee(int id, int age, long salary) < super(); this.id = id; this.age = age; this.salary = salary; >public int getId() < return id; >public int getAge() < return age; >public long getSalary() < return salary; >@Override public int compareTo(Employee o) < if (this.getSalary() >o.getSalary()) < return 1; >else if (this.getSalary() < o.getSalary()) < return -1; >return 0; > >

ArrayList max value : 908022 for emp id : 103

4. Exceptions with Collections.sort()

If the Employee class did not implement a Comparable interface then you will get compile time error as below.

Exception in thread "main" java.lang.Error: Unresolved compilation problem: The method max(Collection) in the type Collections is not applicable for the arguments (List) at com.java.w3schools.blog.arraylist.ArrayListCustomObjectMaxValue.main(ArrayListCustomObjectMaxValue.java:30)

If the list is having other that Employee Objects then it will throw ClassCastException.

If the list is empty then you will get NoSuchElementException.

5. Conclusion

In this article, we’ve seen how to find the max element from the list. Examples are shown for wrapper objects and custom objects in the list to find the max value.

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A example program to find the maximum element from ArrayList. This is implemented in Java and finding max value. Finding max salary from Employee List with Collections.max().

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