Java Program to Compare two Double Arrays

Java double array is used to store double data type values only. The default value of the elements in a double array is 0.

We can compare two double arrays by two ways:

1. By naive approach of traversing through the whole array and comparing each element.
2. By Arrays.equals() method.

Method 1: Naive Approach

• By Comparing one element at a time by traversing through both the arrays using for loop.

Java

// Java program to compare two double arrays

import java.util.*;
import java.lang.*;
import java.io.*;

class GFG {

    public static void main(String[] args) throws java.lang.Exception
    {
        // Two double arrays array1 and array2
        double[] array1 = { 1.5, 2.5, 3.5, 4.5 };
        double[] array2 = { 1.5, 2.5, 3.5 };

        // when the length of two arrays are not
        // same, then both the arrays cannot be equal
        // so no need of comparing each element
        if (array1.length != array2.length)

            System.out.println("Arrays are not Equal");

        else {
            for (int i = 0; i < array1.length; i++)
            {
                // comparing each and every element
                if (array1[i] != array2[i])
                {
                    System.out.println("Arrays are not Equal");
                    System.exit(0);
                }
            }

            System.out.println("Arrays are Equal");
        }
    }
}

Output

Arrays are not Equal

Time Complexity: O(n)

Method 2: Using Arrays.equals() method

Syntax :

public static boolean equals(int[] a, int[] a2)

Parameters : 

• a1 – one array to be tested for equality
• a2 – the other array to be tested for equality

Returns : true if the two arrays are equal

Java

// Java program to compare two double arrays

import java.util.*;
import java.lang.*;
import java.io.*;

class GFG {
    public static void main(String[] args) throws java.lang.Exception
    {
        double[] array1 = { 1.5, 2.5, 3.5, 4.5 };
        double[] array2 = { 1.5, 2.5, 3.5, 4.5 };

        // Arrays.equals() compares the equality
        // of two arrays
        if (Arrays.equals(array1, array2))
            System.out.println("Arrays are Equal");
        else
            System.out.println("Arrays are Not Equal");
    }
}

Output

Arrays are Equal

Time Complexity: O(1)