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How To Return An Array In Java For Those In Need

by richard

Instead of declaring and saving each variable like before, you now can utilize an array to solve the simple problem in Java. Yet, there are too many guides on the Internet that make you confused.

Don’t worry! Our tutorial will show the most details on how to return an array in Java. Wait no more to click on!

What Is An Array?

Whether you’re a professional coder or just a starter, you also need to understand what Java array means to dig into its other functions.

An array is a group of elements of the same type defined in a square bracket couple. You can retrieve these elements by index, starting with 0.

In addition, you need to verify the length of the array since it will always be fixed during operation. If a number of elements changes,  you have to rewrite the new array.

Here is the general method to write the array: <Data Type> <Array Name> [ ].

Assuming that the elements are the numbers from 1 to 5 called “A”, let’s see how to write this array!

int A[ ] = {1, 2, 3, 4, 5}

When accessing each element, you have to use the index and the length property to determine. For the above example, A [0] corresponds to the number 1.

Essential Notes When Returning An Array In Java

Regardless of the array return type, you should notice some points we give below before doing.

  • The data which is responsible for returning a value must be specified in an array-like form of the matching data type. It could be an integer, double, string, or even any appropriated object defined by users.
  • It must have been that at least one variable array or similar specified things handled the returned one.
  • The access modifiers, static and non-static declarations, also affect much of the array method.

Because the Java principle does not accept returning various values simultaneously, this method can be useful. So, how to return an array in Java? Read on to the next section!

How To Return An Array In Java – Three Manners Of Procedure

Compared to the primitive data type, you now can return the references to an array from a method. Here are three types according to detailed samples for you to refer to. Let’s see how to return an array in java!

How To Return An Array In Java- Integer Type

This method is too familiar for programmers to begin with. A simple create integer array could bring the value return by applying statements noted with the above-mentioned key points.

This integer array stores random calculated data and, from then, returns the values to the caller.

If you want to return for this type, let’s follow the below image!

Here is what you will get after executing:

In some cases, the results from computed might get null or empty data. But it would be better to return a blank number because you will have a consistent array, not including special code to process null data.

How To Return An Array In Java – Strings Type

Strings array is to obtain value with a huge amount within one same variant; no need to break down every value for each variant! To do this type, we must use the square brackets to explain the variant for array declaration.

Then, it’s time to arrange and declare data. If you want to add values to these strings, put it into a list with comma-separation, fixed by a curly brace set.

In this case, what you ought to do to the following picture:

After doing this, if the text is “Java, C++, Python, Ruby, C” appearing, that means you’re on the right steps.

How To Return An Array In Java- Two-dimensional Type

As soon as you see a data array that contains one more array inside, that is called multidimensional type in Java. Depending on how large of data, it also has its own different declaration.

Two dimensions are the most common form for this type. Here is the sample for returning a two-dimensional array. There is not much difference compared to the one-dimensional array.

Not done yet!

Those are all what to do in this type, and the output result will be “1 2 3 4 5 6 7 8 9”.

Bottom Lines

Now we make sure that you now get the answer to the question “how to return an array in Java”. If you are stepping on the road of becoming a professional IT-er, you need to get the basics before digging into this field.

Although our tutorial might be short, it has enough of all you need. Don’t hesitate to share with us the difficulties you meet during the code-writing process! 

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