JAVA语言模拟实现移臂调度算法中的FCFS,SSTF,SCAN,电梯调度算法,并设计一个用户图形界面实现交互
时间: 2024-03-26 18:35:05 浏览: 69
好的,以下是我的回答:
为了实现这些算法,我们需要先定义一个磁盘调度器类,该类包含磁头位置、磁道队列、等待队列等属性和方法。然后,针对每个算法,我们可以定义一个子类,继承磁盘调度器类,并重写调度方法。
1. 先来先服务算法(FCFS):
```
import java.util.LinkedList;
public class FCFS extends DiskScheduler {
public void schedule() {
while (!trackQueue.isEmpty()) {
int track = trackQueue.poll();
moveHead(track);
}
}
}
```
2. 最短寻找时间优先算法(SSTF):
```
import java.util.LinkedList;
public class SSTF extends DiskScheduler {
public void schedule() {
while (!trackQueue.isEmpty()) {
int closestTrack = findClosestTrack();
moveHead(closestTrack);
}
}
private int findClosestTrack() {
int closestTrack = -1;
int minDistance = Integer.MAX_VALUE;
for (int track : trackQueue) {
int distance = Math.abs(track - headPosition);
if (distance < minDistance) {
minDistance = distance;
closestTrack = track;
}
}
trackQueue.remove(closestTrack);
return closestTrack;
}
}
```
3. 扫描算法(SCAN):
```
import java.util.Collections;
import java.util.LinkedList;
public class SCAN extends DiskScheduler {
private boolean isMovingUp = true;
public void schedule() {
while (!trackQueue.isEmpty()) {
if (isMovingUp) {
Collections.sort(trackQueue);
} else {
Collections.sort(trackQueue, Collections.reverseOrder());
}
int nextTrack = getNextTrack();
moveHead(nextTrack);
}
}
private int getNextTrack() {
for (int track : trackQueue) {
if (isMovingUp && track >= headPosition) {
trackQueue.remove(track);
return track;
} else if (!isMovingUp && track <= headPosition) {
trackQueue.remove(track);
return track;
}
}
isMovingUp = !isMovingUp;
return getNextTrack();
}
}
```
4. 电梯调度算法:
```
import java.util.Collections;
import java.util.LinkedList;
public class Elevator extends DiskScheduler {
private boolean isMovingUp = true;
private LinkedList<Integer> waitQueue = new LinkedList<Integer>();
public void schedule() {
while (!trackQueue.isEmpty() || !waitQueue.isEmpty()) {
if (isMovingUp) {
Collections.sort(trackQueue);
} else {
Collections.sort(trackQueue, Collections.reverseOrder());
}
int nextTrack = getNextTrack();
moveHead(nextTrack);
}
}
public void addTrack(int track) {
if (isMovingUp && track >= headPosition || !isMovingUp && track <= headPosition) {
trackQueue.add(track);
} else {
waitQueue.add(track);
}
}
private int getNextTrack() {
for (int track : trackQueue) {
if (isMovingUp && track >= headPosition) {
trackQueue.remove(track);
return track;
} else if (!isMovingUp && track <= headPosition) {
trackQueue.remove(track);
return track;
}
}
isMovingUp = !isMovingUp;
if (trackQueue.isEmpty()) {
trackQueue.addAll(waitQueue);
waitQueue.clear();
}
return getNextTrack();
}
}
```
关于用户图形界面的设计,可以使用Java Swing或JavaFX来实现。可以设计一个主界面,其中包括一个选择算法的下拉菜单和一个输入磁道号的文本框。选择算法后,点击“开始”按钮即可开始模拟调度过程,每次访问一个磁道时,将其显示在界面上,并显示当前磁头位置和调度进度。模拟结束后,显示平均寻道时间和平均旋转延迟时间等统计信息。
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