如何在Java中实现数组的复制与排序？基于给定数组及代码框架的技术问询

Got it, let's work through this step by step. Your original code framework has a few syntax hiccups, plus we need to add the logic to copy the array first before sorting so we don't modify the original input.

Issues in the Original Code #

• Case-sensitive typo: Plublic should be public (Java keywords are case-sensitive)
• Missing parameter type: The method parameter toSort needs a type declaration (int[] toSort)
• Incorrect return statement placement: The return line was outside the method body
• No core logic: No code to copy the array or perform the sort

Corrected Working Code #

Here's the fully implemented version that copies the input array first, then sorts the copy (keeping the original array intact):

import java.util.Arrays;

public class Sorter {
    // Corrected method with proper syntax and required functionality
    public int[] sort(int[] toSort) {
        // Create a full copy of the input array to avoid modifying the original
        int[] copiedArray = Arrays.copyOf(toSort, toSort.length);
        
        // Sort the copied array in-place
        Arrays.sort(copiedArray);
        
        // Return the sorted copy
        return copiedArray;
    }

    // Optional main method to test the implementation
    public static void main(String[] args) {
        Sorter sorter = new Sorter();
        int[] originalArray = {10, 5, 42, 17, 108};
        int[] sortedArray = sorter.sort(originalArray);
        
        System.out.println("Original array: " + Arrays.toString(originalArray));
        System.out.println("Sorted copied array: " + Arrays.toString(sortedArray));
    }
}

Key Details #

• Array Copy: Arrays.copyOf(toSort, toSort.length) creates a new array with identical elements to the input. This is crucial because Arrays.sort() modifies the array it's called on—we don't want to change the original.
• Sorting: Arrays.sort(copiedArray) uses an optimized quicksort algorithm for primitive int arrays, which is efficient and standard for this use case.
• Test Output: When you run the main method, you'll see the original array stays unchanged, while the copied version is sorted:

  Original array: [10, 5, 42, 17, 108]
  Sorted copied array: [5, 10, 17, 42, 108]
  

内容的提问来源于stack exchange，提问作者Kelly Fon