Скачать или смотреть How to Sort an Integer Array with Custom Conditions in Java

Learn how to sort an integer array in Java using custom rules that prioritize the largest and smallest values. This simple guide breaks down the process step-by-step.
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Sorting an Integer Array with Custom Conditions in Java

Sorting an array can often feel like a daunting task, especially when you have specific conditions to meet. If you’ve stumbled upon the need to sort an integer array in a manner that prioritizes certain elements over others, you’re in the right place! In this guide, we’ll tackle the problem of sorting the array { 3, 15, 7, 11, 6, 4, 1, 8, 10, 13 } based on specific rules that dictate the arrangement of the integers.

The Array Sorting Problem

You want to sort an array of integers so that:

The largest integer is in the first position.

The second-largest integer is in the last position.

The third-largest integer should be second.

The smallest integer is left in the middle.

For example, given the input array { 1, 2, 3, 4, 5, 6, 7 }, the desired output after sorting would be { 7, 5, 3, 1, 2, 4, 6 }. Let’s break down how to achieve this in Java.

Step-by-Step Solution

Step 1: Sort the Array in Descending Order

To start, we need to sort the array in descending order. This allows us to easily place the largest numbers in their required positions. Use Java’s Arrays and Collections packages for an efficient sort.

Here’s how you can implement it:

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Step 2: Create a New Array to Store the Result

Next, we initialize a new result array where the final sorted numbers will be stored. We’ll use two pointers, one starting from the left end (left) and the other from the right end (right) of the new array.

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Step 3: Fill the Result Array

Here’s where the main logic comes into play. We’ll use a while loop to fill positions in the result array by alternating between the left and right pointers. This ensures that we place the largest numbers appropriately to meet the required conditions:

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Step 4: Print the Result

Finally, we can print the values in our new sorted array to see the result.

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Complete Java Code Example

Here’s the full code compiled into one single block for clarity:

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Conclusion

Sorting an array by specific conditions can be tricky, but by using the right logic and Java’s powerful sorting methods, you can achieve the desired result. In this guide, we have walked through each step of the process, ensuring that you not only have the solution but understand the logic behind it. Now you can apply these principles to similar sorting tasks and enhance your programming skills further!