移动臂调度算法的模拟实现Java
时间: 2023-11-18 22:05:21 浏览: 77
移动臂调度算法是一种常见的磁盘调度算法,主要用于提高磁盘的访问效率。下面是一个基于Java语言的移动臂调度算法的模拟实现:
```
import java.util.*;
public class DiskSchedulingAlgorithm {
public static void main(String[] args) {
int[] requests = {98, 183, 37, 122, 14, 124, 65, 67};
int head = 53;
int direction = 1; // 1 for right, -1 for left
int maxCylinder = 199;
int minCylinder = 0;
int totalSeekTime = 0;
System.out.println("Requests: " + Arrays.toString(requests));
System.out.println("Head: " + head);
System.out.println("Direction: " + (direction == 1 ? "right" : "left"));
// sort the requests in ascending order
Arrays.sort(requests);
while (requests.length > 0) {
int nextCylinder = -1;
int minDistance = Integer.MAX_VALUE;
// find the next closest cylinder
for (int i = 0; i < requests.length; i++) {
int distance = Math.abs(head - requests[i]);
if (distance < minDistance) {
minDistance = distance;
nextCylinder = requests[i];
}
}
// remove the next cylinder from requests list
int[] newRequests = new int[requests.length - 1];
int index = 0;
for (int i = 0; i < requests.length; i++) {
if (requests[i] != nextCylinder) {
newRequests[index++] = requests[i];
}
}
requests = newRequests;
// move the head to the next cylinder and update the total seek time
totalSeekTime += minDistance;
head = nextCylinder;
// change direction if the head reaches the end of the disk
if (head == maxCylinder || head == minCylinder) {
direction = -direction;
}
}
System.out.println("Total seek time: " + totalSeekTime);
}
}
```
在这个实现中,我们使用了一个数组来存储磁盘访问请求,并且将请求按照升序排序。然后我们不断地找到离当前磁道最近的请求,并将磁头移动到该请求所在的磁道。在移动磁头的过程中,我们需要更新总的寻道时间。当磁头到达磁盘的边缘时,我们需要改变移动方向。最终,我们输出总的寻道时间。
注意,这只是一个简单的模拟实现,实际应用中还需要考虑更多的因素,比如磁盘的旋转延迟和磁盘缓存的大小等。