java实现osLRU页面置换算法
时间: 2023-11-26 07:47:06 浏览: 38
以下是Java实现OS LRU页面置换算法的示例代码:
```java
import java.util.*;
public class OS_LRU {
public static void main(String[] args) {
int[] pages = {4, 3, 2, 1, 4, 3, 5, 4, 3, 2, 1, 5};
int capacity = 3;
System.out.println("Page Faults: " + pageFaults(pages, capacity));
}
static int pageFaults(int[] pages, int capacity) {
Set<Integer> set = new HashSet<>(capacity);
Queue<Integer> queue = new LinkedList<>();
int pageFaults = 0;
for (int i = 0; i < pages.length; i++) {
if (!set.contains(pages[i])) {
if (set.size() == capacity) {
int last = queue.remove();
set.remove(last);
}
set.add(pages[i]);
queue.add(pages[i]);
pageFaults++;
} else {
queue.remove(pages[i]);
queue.add(pages[i]);
}
}
return pageFaults;
}
}
```