Java Program to Find the Largest Number in an Array

In the previous article, we have seen Java Program to Find the Average of an Array

In this article we are going to see how we can find the largest element in an array.

Java Program to Find the Largest Number in an Array

Prerequisite:

See below articles to know more about Array, array declaration, array instantiation and array initialization.

Let’s see different ways to find largest element in the array.

By Comparing Array Elements
By Using Arrays.sort Method
By Using array list and collections
By Using Stream API

Method-1: Java Program to Find the Largest Number in an Array By Comparing Array Elements

Approach:

Take an array with elements in it.
Print the array elements.
Create a variable and store the first element of the array in it.
Compare the variable with the whole array to find and store the largest element.
Print the largest element.

Program:

import java.util.Arrays;
import java.util.Scanner;

public class Main
{
    public static void main(String args[])
    {
        // Creating the array
        int arr[] = {12, 2, 34, 20, 54, 6};

        // Initializing the first element of the array to large
        int large=arr[0];        
        
        // Compares all the element to find out the largest one
        for(int i:arr)
        {
            if(large<i)
                large=i;
        }

        // Prints the array elements
        System.out.println("The array elements are"+Arrays.toString(arr));
        
        // Prints the largest element
        System.out.println("The largest element of the array is: "+large);
    }
}

Output:

The array elements are[12, 2, 34, 20, 54, 6]
The largest element of the array is: 54

Method-2: Java Program to Find the Largest Number in an Array By Using Arrays.sort Method

Approach:

Take an array with elements in it.
Print the array elements.
Use Arrays.sort function to sort the array in ascending order.
Print the last element.

Program:

 import java.util.Arrays;
import java.util.Scanner;
public class array{
    public static void main(String args[])
    {
        // Creating the array
        int arr[] = {12, 2, 34, 20, 54, 6};
        
        // Sorts the array in ascending order
        Arrays.sort(arr);

        // Prints the array elements
        System.out.println("The array elements are"+Arrays.toString(arr));
        
        // Prints the largest element
        System.out.println("The largest element of the array is: "+arr[arr.length-1]);
    }
}

Output:

The array elements are[2, 6, 12, 20, 34, 54]
The largest element of the array is: 54

Method-3: Java Program to Find the Largest Number in an Array By Using array list and collections

Approach:

Take an array with elements in it.
Print the array elements.
Convert the array elements into a list.
Use the Collection.sort function to sort the list in ascending order.
Print the last element.

Program:

import java.util.*;
import java.util.Scanner;
public class array{
    public static void main(String args[])
    {
        // Creating the array
        Integer arr[] = {12, 2, 34, 20, 54, 6};
        
        // Converts the array into a list
        List<Integer> list=Arrays.asList(arr);
        // Sorts the array in ascending order  
        Collections.sort(list);  

        // Prints the array elements
        System.out.println("The array elements are"+Arrays.toString(arr));
        
        // Prints the largest element
        System.out.println("The largest element of the array is: "+list.get(arr.length-1));
    }
}

Output:

The array elements are[2, 6, 12, 20, 34, 54]
The largest element of the array is: 54

Method-4: Java Program to Find the Largest Number in an Array By Using Stream API

Approach:

Take an array with elements in it.
Print the array elements.
Pass the array into the stream function max( ) to find out the largest element.
Print the element.

Program:

import java.util.*;
import java.util.Scanner;

public class Main
{
    public static void main(String args[])
    {
        // Creating the array
        int arr[] = {12, 2, 34, 20, 54, 6};
        
        // Using the stream API
        int large = Arrays.stream(arr).max().getAsInt();  

        // Prints the array elements
        System.out.println("The array elements are"+Arrays.toString(arr));
        
        // Prints the largest element
        System.out.println("The largest element of the array is: "+ large);
    }
}

Output:

The array elements are[12, 2, 34, 20, 54, 6]
The largest element of the array is: 54

Enhancing programming skills is very important no matter what language you have chosen. So, practice frequently with these simple java programs examples and excel in coding the complex logic.

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