冒泡排序法:關(guān)鍵字較小的記錄好比氣泡逐趟上浮,關(guān)鍵字較大的記錄好比石塊下沉,每趟有一塊最大的石塊沉底。
算法本質(zhì):(最大值是關(guān)鍵點,肯定放到最后了,如此循環(huán))每次都從第一位向后滾動比較,使最大值沉底,最小值上升一次,最后一位向前推進(即最后一位剛確定的最大值不再參加比較,比較次數(shù)減1)
復(fù)雜度: 時間復(fù)雜度 O(n2) ,空間復(fù)雜度O(1)
JAVA源代碼(成功運行,需要Date類)
public static void bubbleSort(Date[] days) {
int len = days.length;
Date temp;
for (int i = len - 1; i >= 1; i--) {
for (int j = 0; j < i; j++) {
if (days[j].compare(days[j + 1]) > 0) {
temp = days[j + 1];
days[j + 1] = days[j];
days[j] = temp;
}
}
}
}
class Date {
int year, month, day;
Date(int y, int m, int d) {
year = y;
month = m;
day = d;
}
public int compare(Date date) {
return year > date.year ? 1 : year < date.year ? -1
: month > date.month ? 1 : month < date.month ? -1
: day > date.day ? 1 : day < date.day ? -1 : 0;
}
public void print() {
System.out.println(year + " " + month + " " + day);
}
}
package testSortAlgorithm;
public class BubbleSort {
public static void main(String[] args) {
int array[] = { 5, 6, 8, 4, 2, 4, 9, 0 };
bubbleSort(array);
for (int i = 0; i < array.length; i++) {
System.out.println(array[i]);
}
}
public static void bubbleSort(int array[]) {
int temp;
for (int i = array.length - 1; i > 0; i--) {
for (int j = 0; j < i; j++) {
if (array[j] > array[j + 1]) {
temp = array[j];
array[j] = array[j + 1];
array[j + 1] = temp;
}
}
}
}
}