Java bubble sort analysis: simple and easy to understand version

Concise and easy-to-understand Java bubble sort algorithm analysis

In computer science, bubble sort is a simple but inefficient sorting algorithm. It repeatedly iterates through the elements to be sorted, comparing two adjacent elements in sequence, and swaps them if they are in the wrong order. This process continues until the entire sequence is sorted. The bubble sort algorithm will be analyzed in detail below.

The principle of the bubble sorting algorithm is to bubble the largest (or smallest) element to the end (or beginning) of the sequence by continuously comparing and exchanging adjacent elements, and then performs operations on the remaining elements. Same operation until the entire sequence is in order.

The algorithm steps are as follows:

1. Start from the first element of the sequence and compare the size of this element with the next element.
2. If the order is wrong, swap.
3. Continue to compare the next adjacent element and repeat steps 1 and 2.
4. Until the traversal completes one round, a complete comparison and exchange of the entire sequence has been performed.
5. Re-start the first round of comparison and exchange, but the range traversed this time does not include the sorted elements.
6. Repeat steps 1 to 5 until the entire sequence is in order.

The following is a sample code of a simple bubble sort algorithm:

public class BubbleSort {
    public static void bubbleSort(int[] arr) {
        boolean swapped;
        for (int i = 0; i < arr.length - 1; i++) {
            swapped = false;
            for (int j = 0; j < arr.length - 1 - i; j++) {
                if (arr[j] > arr[j + 1]) {
                    int temp = arr[j];
                    arr[j] = arr[j + 1];
                    arr[j + 1] = temp;
                    swapped = true;
                }
            }
            if (!swapped) {
                break;
            }
        }
    }
    
    public static void main(String[] args) {
        int[] arr = {5, 3, 8, 2, 1, 4};
        bubbleSort(arr);
        for (int num : arr) {
            System.out.print(num + " ");
        }
        System.out.println();
    }
}

In the above code, we define a bubbleSort method to implement bubble sorting Bubble sort. swappedThe variable is used to record whether swapping has occurred. If no swapping has occurred, it means that the sorting has been completed and the sorting can be ended early. In the main method, we define an integer array and sort it, and then output the sorted result through a loop.

The above is a concise and easy-to-understand analysis of the bubble sort algorithm and the corresponding Java sample code. Although bubble sort has high time complexity, it is very simple and intuitive to sort some small-scale data sets.

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