普通版本

public class BubbleSort {
    public void sort(int array[]) {
        for (int i = 0; i < array.length - 1; i++) {
            for (int j = 0; j < array.length - i - 1; j++) {
                int temp;
                if (array[j] > array[j + 1]) {
                    temp = array[j];
                    array[j] = array[j + 1];
                    array[j + 1] = temp;
                }
            }
        }
    }
}
 

改進版本

public class BubbleSort {
    public void sort(int array[]) {
        for (int i = 0; i < array.length - 1; i++) {
            boolean isSorted = true;
            for (int j = 0; j < array.length - i - 1; j++) {
                int temp;
                if (array[j] > array[j + 1]) {
                    temp = array[j];
                    array[j] = array[j + 1];
                    array[j + 1] = temp;
                    isSorted = false;
                }
            }
            if (isSorted)
                break;
        }
    }
}