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:
- By simply iterating through the whole array and comparing each element one by one.
- 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 chek 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 ; } } |
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)); } } |
false false false true false
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