用Java编写一个存储管理的代码
时间: 2023-08-28 17:03:27 浏览: 44
好的,下面是一个简单的Java代码示例,用于实现FIFO算法和LRU算法的存储管理系统:
```java
import java.util.*;
public class StorageManager {
private int memoryCapacity;
private Queue<Integer> fifoQueue;
private LinkedList<Integer> lruList;
public StorageManager(int memoryCapacity) {
this.memoryCapacity = memoryCapacity;
this.fifoQueue = new LinkedList<>();
this.lruList = new LinkedList<>();
}
public void requestPage(int page) {
if (fifoQueue.contains(page)) {
// Page hit in FIFO algorithm
} else {
if (fifoQueue.size() < memoryCapacity) {
// Page fault in FIFO algorithm, add page to memory
fifoQueue.offer(page);
} else {
// Page fault in FIFO algorithm, replace the oldest page
int oldestPage = fifoQueue.poll();
fifoQueue.offer(page);
}
}
if (lruList.contains(page)) {
// Page hit in LRU algorithm, move page to front of the list
lruList.remove((Integer) page);
lruList.addFirst(page);
} else {
if (lruList.size() < memoryCapacity) {
// Page fault in LRU algorithm, add page to memory
lruList.addFirst(page);
} else {
// Page fault in LRU algorithm, replace the least recently used page
int lruPage = lruList.removeLast();
lruList.addFirst(page);
}
}
}
public double getFifoHitRate() {
int hits = memoryCapacity - fifoQueue.size();
int misses = fifoQueue.size();
return (double) hits / (hits + misses);
}
public double getLruHitRate() {
int hits = memoryCapacity - lruList.size();
int misses = lruList.size();
return (double) hits / (hits + misses);
}
}
```
在这个示例中,我们使用了Java中的Queue和LinkedList来实现FIFO算法和LRU算法。存储管理系统的构造函数接受一个内存容量参数,并初始化FIFO队列和LRU链表。requestPage方法接受一个页面参数,并根据FIFO算法和LRU算法的规则将页面添加到内存中。getFifoHitRate和getLruHitRate方法分别返回FIFO算法和LRU算法的命中率。
希望这个示例对您有所帮助!