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Program: How to compare two arrays and confirm they are equal?


Java Arrays class provides few utility methods. One of the utility method Arrays.deepEquals() helps us to compare two arrays. This method compares the array objects each other, and returns true if both arrays are holding same objects. Below example shows how to compare two arrays.

package com.java2novice.arrays;

import java.util.Arrays;

public class MyArrayDeepEquals {

	public static void main(String a[]){
		String[] strArr = {"JAVA", "C++", "PERL", "STRUTS", "PLAY"};
		String[] strArrCopy = {"JAVA", "C++", "PERL", "STRUTS", "PLAY"};
		System.out.println("Are strArr and strArrCopy same? "
					+Arrays.deepEquals(strArr, strArrCopy));
		String[] strArrMod = {"JAVA", "C++", "PERL", "STRUTS"};
		System.out.println("Are strArr and strArrMod same? "
					+Arrays.deepEquals(strArr, strArrMod));

Are strArr and strArrCopy same? true
Are strArr and strArrMod same? false
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Knowledge Centre
Pass by value Vs Pass by reference
Pass by value: Passing a copy of the value, not the original reference.

Pass by reference: Passsing the address of the object, so that you can access the original object.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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