Java Program to Compare two Float Arrays

An array is a collection of items stored at contiguous memory locations. The idea is to store multiple items of the same type together.The base value is index 0 and the difference between the two indexes is the offset.

In this program, we need to compare two arrays having elements of float type.

Two arrays are equal if they contain the same elements in the same order. Two array references are considered equal if both are null.

Example:

float[] floatV1 = new float[] { 3.1f, 7.5f, 8.3f };
float[] floatV2 = new float[] { 8.3f, 8.8f, 9.2f };
float[] floatV3 = new float[] { 3.1f, 7.5f, 8.3f };
float[] floatV4 = new float[] { 3.2f, 5.5f, 5.3f };

if we compare the two arrays using Arrays.equals() method, it will return true/false.

Arrays.equals(floatV1, floatV2) will give us false
Arrays.equals(floatV3, floatV4) will give us false
Arrays.equals(floatV1, floatV3) will give us true

There are two ways by which we can compare two float arrays:

1. By simply iterating through the whole array and comparing each element one by one.
2. Using Arrays.equals(arr1,arr2) method

Method 1: By simply iterating through the whole array and comparing each element one by one.

Java

// Java program to compare two float arrays
// using simple iteration

import java.util.Arrays;
public class GFG {
    public static void main(String args[])
    {
        // declaring values in float arrays
        float[] floatV1 = new float[] { 3.1f, 7.5f, 8.3f };
        float[] floatV2 = new float[] { 8.9f, 8.8f, 9.2f };
        float[] floatV3 = new float[] { 3.1f, 7.5f, 8.3f };

        System.out.println(compareArrays(floatV2, floatV3));
        System.out.println(compareArrays(floatV1, floatV3));
        System.out.println(compareArrays(floatV1, floatV2));
    }
    public static boolean compareArrays(float arr1[],float arr2[])
    {
        // if the length of the two arrays are not
        // same then the arrays cannot be equal
        if (arr1.length != arr2.length)
            return false;

        for (int i = 0; i < arr1.length; i++) {

            // if the two ith elements of the two arrays
            // are not same then simply return false
            // and do not check further elements
            if (arr1[i] != arr2[i])
                return false;
        }

        // else if we come out of the for loop
        // successfully without returning false ,
        // then that means all the elements were equal
        return true;
    }
}

Output

false
true
false

Method 2: Using Arrays.equals() method

Syntax:

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

Parameters:

• a – 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 float arrays
// using Arrays.equals() method

import java.util.Arrays;
public class GFG {
    public static void main(String args[])
    {
        // declaring values in float arrays
        float[] floatV1 = new float[] { 3.1f, 7.5f, 8.3f };
        float[] floatV2 = new float[] { 8.9f, 8.8f, 9.2f };
        float[] floatV3 = new float[] { 3.1f, 7.5f, 8.3f };
        float[] floatV4 = new float[] { 3.4f, 5.5f, 5.3f };

        // printing and comparing the arrays
        // as it will return boolean value
        // i.e. either true or false
        System.out.println(Arrays.equals(floatV1, floatV2));
        System.out.println(Arrays.equals(floatV2, floatV3));
        System.out.println(Arrays.equals(floatV3, floatV4));
        System.out.println(Arrays.equals(floatV1, floatV3));
        System.out.println(Arrays.equals(floatV1, floatV4));
    }
}

Output

false
false
false
true
false