银行家算法java的实现

银行家算法是一种用于避免死锁的资源分配算法。下面是一个简单的银行家算法的Java实现示例：

import java.util.Arrays;

public class BankersAlgorithm {
    
    private int numOfProcesses; // 进程数量
    private int numOfResources; // 资源数量
    private int[] available; // 可用资源数组
    private int[][] max; // 最大需求矩阵
    private int[][] allocation; // 已分配矩阵
    private int[][] need; // 还需资源矩阵
    
    public BankersAlgorithm(int[] available, int[][] max, int[][] allocation) {
        this.numOfProcesses = max.length;
        this.numOfResources = available.length;
        this.available = available;
        this.max = max;
        this.allocation = allocation;
        this.need = new int[numOfProcesses][numOfResources];
        
        // 计算还需资源矩阵
        for (int i = 0; i < numOfProcesses; i++) {
            for (int j = 0; j < numOfResources; j++) {
                need[i][j] = max[i][j] - allocation[i][j];
            }
        }
    }
    
    public boolean isSafeState() {
        boolean[] finish = new boolean[numOfProcesses];
        int[] work = Arrays.copyOf(available, numOfResources);
        
        // 初始化所有进程为未完成状态
        Arrays.fill(finish, false);
        
        int count = 0;
        while (count < numOfProcesses) {
            boolean found = false;
            for (int i = 0; i < numOfProcesses; i++) {
                if (!finish[i]) {
                    boolean canAllocate = true;                    for (int j = 0; j < numOfResources; j++) {
                        if (need[i][j] > work[j]) {
                            canAllocate = false;
                            break;
                        }
                    }
                    
                    if (canAllocate) {
                        // 分配资源
                        for (int j = 0; j < numOfResources; j++) {
                            work[j] += allocation[i][j];
                        }
                        
                        finish[i] = true;
                        found = true;
                        count++;
                    }
                }
            }
            
            // 没有可分配的进程
            if (!found) {
                break;
            }
        }
        
        return count == numOfProcesses;    }
}

以上是银行家算法的简单实现，你可以根据需要进行调用和测试。