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Array Methods: Doubling and Tripling

When working with arrays in programming, there are many methods that can be used to manipulate their contents. In this article, we will explore two such methods: doubling and tripling. These methods allow you to modify specific elements of an array without affecting the rest.

Doubling the First Five Elements in an Array

Let's take a look at some code that doubles the first five elements in an array:

```

public class ArrayWorker {

private int'' array;

public ArrayWorker(int'' array) {

this.array = array;

}

public void doubleFirstFive() {

for (int i = 0; i < 5 && i < array.length; i++) {

array'i' *= 2;

}

```

In this code, the `doubleFirstFive()` method loops through the first five elements of the array and doubles each one. The loop uses a conditional statement to ensure that it doesn't try to access elements beyond the length of the array.

Tripling the First Four Elements in an Array

Now let's write a similar method called `tripleFirstFour()` that triples the first four elements of the array:

```

public class ArrayWorker {

private int'' array;

public ArrayWorker(int'' array) {

this.array = array;

}

public void tripleFirstFour() {

for (int i = 0; i < 4 && i < array.length; i++) {

array'i' *= 3;

}

```

This method works in the same way as `doubleFirstFive()`, but it triples the first four elements of the array instead.

Testing the Methods

To test these methods, we can create an instance of the `ArrayWorker` class and call the methods on it:

```

public static void main(String'' args) {

int'' array = {1, 2, 3, 4, 5};

ArrayWorker worker = new ArrayWorker(array);

worker.doubleFirstFive();

System.out.println(Arrays.toString(worker.array));

worker.tripleFirstFour();

System.out.println(Arrays.toString(worker.array));

}

```

This code creates an instance of the `ArrayWorker` class with an array containing the numbers 1 through 5. It then calls the `doubleFirstFive()` method to double the first five elements, and prints out the resulting array. Next, it calls the `tripleFirstFour()` method to triple the first four elements, and prints out the resulting array.

In this article, we have seen how to use methods to manipulate specific elements of an array. The `doubleFirstFive()` method doubles the first five elements of an array, while the `tripleFirstFour()` method triples the first four elements. By using these methods, you can modify arrays in a flexible and efficient way.

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