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124 lines
3.4 KiB
124 lines
3.4 KiB
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八大排序
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---
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#### 前言
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八大排序：
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1. 冒泡排序
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2. 插入排序
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3. 选择排序
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4. 快速排序
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5. 堆排序
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#### 冒泡排序
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```java
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private static void sort(int[] data) {
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//排序
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for (int i = 0; i < data.length - 1; i++) {
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boolean isSorted = true;
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for (int j = 0; j < data.length-1-i; j++) {
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if (data[j+1] < data[j]) {
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int temp = data[j+1];
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data[j+1] = data[j];
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data[j] = temp;
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isSorted = false;
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}
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}
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if (isSorted) break;
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}
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//输出
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System.out.println(Arrays.toString(data));
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}
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```
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#### 插入排序
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```java
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private static void sort(int[] data) {
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//排序
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for (int i = 1; i < data.length; i++) {
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for (int j = i; (j > 0) && (data[j - 1] > data[j]); j--) {
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int temp = data[j];
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data[j] = data[j - 1];
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data[j - 1] = temp;
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}
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}
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//输出
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System.out.println(Arrays.toString(data));
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}
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```
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#### 选择排序
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```java
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private static void sort(int[] data) {
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//排序
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for (int i = 0; i < data.length - 1; i++) {
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for (int j = i + 1; j < data.length; j++) {
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if (data[i] > data[j]) {
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int temp = data[i];
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data[i] = data[j];
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data[j] = temp;
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}
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}
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}
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//输出
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System.out.println(Arrays.toString(data));
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}
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```
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#### 快速排序
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```java
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public class QuickSort {
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public static void main(String[] args) {
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int[] data = new int[]{1, 4, 0, 4, 7, 2, 9, 8};
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//排序
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sort(data, 0, data.length - 1);
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//输出
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System.out.println(Arrays.toString(data));
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}
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private static void sort(int[] data, int left, int right) {
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//左下标一定小于又下标，否则就越界了
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if (left < right) {
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//对数组进行分割，取出下次分割的基准标号
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int base = division(data, left, right);
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//对基准标号左侧的一组数组进行递归的切割，以至于将这些数值完整的排序
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sort(data, left, base - 1);
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//对基准标号右侧的一组数值进行递归的切割，以至于将这些数值
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sort(data, base + 1, right);
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}
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}
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private static int division(int[] list, int left, int right) {
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//以左边的数为基本值
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int base = list[left];
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while (left < right) {
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//从序列右端开始，往左遍历，直到找到小于 base 的值
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while (left < right && list[right] >= base) {
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right--;
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}
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//找到比 base 小的元素，将这个元素放在最左边的位置
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list[left] = list[right];
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//从序列左端开始，往右遍历，直到找到大于 base 的值
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while (left < right && list[left] <= base) {
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left++;
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}
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//找到比 base 大的元素，将这个元素放在最右边的位置
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list[right] = list[left];
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}
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//最后将base放到left位置，此时，left位置的左侧数值都应该比left小;
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//而left位置的右侧数值都应该比left大
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list[left] = base;
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return left;
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}
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}
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```
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#### 堆排序
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