银行家算法JAVA代码

银行家算法是一种避免死锁的算法，它可以通过安全性检查来避免系统进入不安全状态。下面是一个简单的银行家算法的JAVA代码实现：

public class BankerAlgorithm {
    private int[][] max; // 最大需求矩阵
    private int[][] allocation; // 已分配矩阵
    private int[][] need; // 需求矩阵
    private int[] available; // 可用资源向量
    private int processNum; // 进程数
    private int resourceNum; // 资源种类数

    public BankerAlgorithm(int[][] max, int[][] allocation, int[] available) {
        this.max = max;
        this.allocation = allocation;
        this.available = available;
        this.processNum = max.length;
        this.resourceNum = available.length;
        this.need = new int[processNum][resourceNum];
        for (int i = 0; i < processNum; i++) {
            for (int j = 0; j < resourceNum; j++) {
                need[i][j] = max[i][j] - allocation[i][j];
            }
        }
    }

    public boolean isSafe() {
        boolean[] finish = new boolean[processNum];
        int[] work = new int[resourceNum];
        for (int i = 0; i < resourceNum; i++) {
            work[i] = available[i];
        }
        int count = 0;
        while (count < processNum) {
            boolean flag = false;
            for (int i = 0; i < processNum; i++) {
                if (!finish[i]) {
                    boolean temp = true;
                    for (int j = 0; j < resourceNum; j++) {
                        if (need[i][j] > work[j]) {
                            temp = false;
                            break;
                        }
                    }
                    if (temp) {
                        for (int j = 0; j < resourceNum; j++) {
                            work[j] += allocation[i][j];
                        }
                        finish[i] = true;
                        flag = true;
                        count++;
                    }
                }
            }
            if (!flag) {
                return false;
            }
        }
        return true;
    }
}