How To PRINT A JAVA ARRAY The EASIEST Way!

If I have an array in Java, what is the simplest way to print a Java array? Can I override a toString() method like I do in a class? Are there application security concerns I should know about?

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Chapters

00:00 Introduction
00:22 Overview
01:08 How to print an array in Java?
04:08 The simplest way to print a Java array for Java 8+
05:08 Coding example for how to print a Java array
10:52 Application security concerns for how to print a Java array

So the question we address in this video is: What is the simplest way to print a Java array.

Like primitives in Java, arrays do not have a toString method that you can use to print them directly.

So there is no ability for you to override the toString method and create custom output

As an example, let’s say that we have an array which looks like the following

We have an int array variable called myIntArray and we initlize it to the values 0, 1, 2 and 3

If we try a naïve approach and print that variable out using a system out printline statement, we’ll get a strange looking result.

This result is actually the value that is in the hascode representation of the array shown in hex

So we know what does not work, let’s take a look at several of the ways that will work

The Arrays class has been around since Java 1.2

And the method toString in the Arrays class has been around since Java 1.5

To use this class, we’ll need to add the statement

Import java.util.Arrays;

To our class

Using the toString method of the Arrays class, we can print out the array quite easily.

As a reminder, we have an integer array called myIntArray conaining the values 0 1 2 and 3

If we use the pass the array to Arrays dot toString and print that out using system out println

We will get a nicely formatted result, enclosed in brackets with commas between the members of
the array

This technique will work equally well for an array of Strings arrays in java java array of objects java arrays java arrays and loops