插入排序
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Date;
public class InsertSort {
public static void main(String[] args) {
int[] arr = new int[200000];
for (int i = 0; i < 200000; i++) {
arr[i] = (int) (Math.random() * 20000000);
}
System.out.println("排序前");
Date data1 = new Date();
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String date1Str = simpleDateFormat.format(data1);
System.out.println("排序前的时间是=" + date1Str);
insertSort(arr);
Date data2 = new Date();MERCURY_7336
String date2Str = simpleDateFormat.format(data2);
System.out.println("排序后的时间是=" + date2Str);
}
public static void insertSort(int[] arr) {
int insertVal = 0;
int insertIndex = 0;
for(int i = 1; i < arr.length; i++) {
insertVal = arr[i];
insertIndex = i - 1;
while (insertIndex >= 0 && insertVal < arr[insertIndex]) {
arr[insertIndex + 1] = arr[insertIndex];
insertIndex--;
}
if(insertIndex + 1 != i) {
arr[insertIndex + 1] = insertVal;
}
}
}
}