银行家算法java
时间: 2023-06-29 12:17:21 浏览: 41
银行家算法是一种资源分配算法,用于避免死锁。以下是一个简单的 Java 实现:
```java
public class BankersAlgorithm {
private int[][] need;
private int[][] allocation;
private int[] available;
private int numOfProcesses;
private int numOfResources;
public BankersAlgorithm(int[][] need, int[][] allocation, int[] available) {
this.need = need;
this.allocation = allocation;
this.available = available;
this.numOfProcesses = need.length;
this.numOfResources = available.length;
}
public boolean isSafe() {
boolean[] visited = new boolean[numOfProcesses];
int[] work = Arrays.copyOf(available, numOfResources);
int count = 0;
while (count < numOfProcesses) {
boolean found = false;
for (int i = 0; i < numOfProcesses; i++) {
if (!visited[i]) {
boolean canBeAllocated = true;
for (int j = 0; j < numOfResources; j++) {
if (need[i][j] > work[j]) {
canBeAllocated = false;
break;
}
}
if (canBeAllocated) {
visited[i] = true;
found = true;
count++;
for (int j = 0; j < numOfResources; j++) {
work[j] += allocation[i][j];
}
break;
}
}
}
if (!found) {
break;
}
}
return count == numOfProcesses;
}
}
```
在此实现中,`need` 是一个二维数组,表示每个进程需要的各种资源数量。`allocation` 是另一个二维数组,表示已分配给每个进程的各种资源数量。`available` 是一个一维数组,表示当前可用的各种资源数量。`isSafe()` 方法将返回一个布尔值,表示系统是否处于安全状态。如果返回 `true`,则系统处于安全状态,否则处于不安全状态。