快速排序

通过一趟排序将待排序记录分割成独立的两部分，其中一部分记录的关键字均比另一部分关键字小，则分别对这两部分继续进行排序，直到整个序列有序。

public class QuickSort {
private static void swap(int[] data, int i, int j) {
int temp = data[i];
data[i] = data[j];
data[j] = temp;
}

private static void subSort(int[] data, int start, int end) {
if (start < end) {
int base = data[start];
int low = start;
int high = end + 1;
while (true) {
while (low < end && data[++low] - base <= 0)
;
while (high > start && data[--high] - base >= 0)
;
if (low < high) {
swap(data, low, high);
} else {
break;
}
}
swap(data, start, high);

subSort(data, start, high - 1);//递归调用
subSort(data, high + 1, end);
}
}
public static void quickSort(int[] data){
subSort(data,0,data.length-1);
}

public static void main(String[] args) {
int[] data = { 9, -16, 30, 23, -30, -49, 25, 21, 30 };
System.out.println("排序之前：\n" + java.util.Arrays.toString(data));
quickSort(data);
System.out.println("排序之后：\n" + java.util.Arrays.toString(data));
}

subSort(data, start, high - 1);//递归调用
subSort(data, high + 1, end);
}
}
public static void quickSort(int[] data){
subSort(data,0,data.length-1);
}

数组的冒泡排序的实现
public class BubbleSortTest {
public static void main(String[] args) {

int[] arr = new int[]{43,32,76,-98,0,64,33,-21,32,99};

//冒泡排序
for(int i = 0;i < arr.length - 1;i++){

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;
}

}

for(int i = 0;i < arr.length;i++){
System.out.print(arr[i] + "\t");
}

}