java编程实现编程实现:设一列关键字为{3,17,12,61,8,70,97,75,53,26,54,61},分别实现直接插入排序,希尔排序、冒泡排序、快速排序、选择排序和归并排序
时间: 2023-10-04 14:12:37 浏览: 61
直接插入排序的Java实现:
```java
public static void insertSort(int[] arr) {
int n = arr.length;
for (int i = 1; i < n; i++) {
int key = arr[i];
int j = i - 1;
while (j >= 0 && arr[j] > key) {
arr[j + 1] = arr[j];
j--;
}
arr[j + 1] = key;
}
}
```
希尔排序的Java实现:
```java
public static void shellSort(int[] arr) {
int n = arr.length;
int gap = n / 2;
while (gap > 0) {
for (int i = gap; i < n; i++) {
int temp = arr[i];
int j = i;
while (j >= gap && arr[j - gap] > temp) {
arr[j] = arr[j - gap];
j -= gap;
}
arr[j] = temp;
}
gap /= 2;
}
}
```
冒泡排序的Java实现:
```java
public static void bubbleSort(int[] arr) {
int n = arr.length;
for (int i = 0; i < n - 1; i++) {
for (int j = 0; j < n - i - 1; j++) {
if (arr[j] > arr[j + 1]) {
int temp = arr[j];
arr[j] = arr[j + 1];
arr[j + 1] = temp;
}
}
}
}
```
快速排序的Java实现:
```java
public static void quickSort(int[] arr, int low, int high) {
if (low < high) {
int pivot = partition(arr, low, high);
quickSort(arr, low, pivot - 1);
quickSort(arr, pivot + 1, high);
}
}
private static int partition(int[] arr, int low, int high) {
int pivot = arr[high];
int i = low - 1;
for (int j = low; j < high; j++) {
if (arr[j] < pivot) {
i++;
int temp = arr[i];
arr[i] = arr[j];
arr[j] = temp;
}
}
int temp = arr[i + 1];
arr[i + 1] = arr[high];
arr[high] = temp;
return i + 1;
}
```
选择排序的Java实现:
```java
public static void selectionSort(int[] arr) {
int n = arr.length;
for (int i = 0; i < n - 1; i++) {
int minIndex = i;
for (int j = i + 1; j < n; j++) {
if (arr[j] < arr[minIndex]) {
minIndex = j;
}
}
int temp = arr[i];
arr[i] = arr[minIndex];
arr[minIndex] = temp;
}
}
```
归并排序的Java实现:
```java
public static void mergeSort(int[] arr, int left, int right) {
if (left < right) {
int mid = (left + right) / 2;
mergeSort(arr, left, mid);
mergeSort(arr, mid + 1, right);
merge(arr, left, mid, right);
}
}
private static void merge(int[] arr, int left, int mid, int right) {
int n1 = mid - left + 1;
int n2 = right - mid;
int[] L = new int[n1];
int[] R = new int[n2];
for (int i = 0; i < n1; i++) {
L[i] = arr[left + i];
}
for (int i = 0; i < n2; i++) {
R[i] = arr[mid + 1 + i];
}
int i = 0, j = 0, k = left;
while (i < n1 && j < n2) {
if (L[i] <= R[j]) {
arr[k] = L[i];
i++;
} else {
arr[k] = R[j];
j++;
}
k++;
}
while (i < n1) {
arr[k] = L[i];
i++;
k++;
}
while (j < n2) {
arr[k] = R[j];
j++;
k++;
}
}
```
以上就是这六种排序算法的Java实现。
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