java实现银行家算法界面

以下是一个简单的 Java 界面实现银行家算法的例子：

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class BankerAlgorithm implements ActionListener {

    JFrame frame;
    JLabel processesLabel, resourcesLabel, allocationLabel, maxLabel, availableLabel, resultLabel;
    JTextField processesField, resourcesField, availableField;
    JPanel inputPanel, allocationPanel, maxPanel, availablePanel, resultPanel, buttonPanel;
    JButton runButton, resetButton;
    JTextField[][] allocationFields, maxFields;
    int[][] allocation, max, need, available;
    int[] processes, resources;

    public BankerAlgorithm() {
        frame = new JFrame("银行家算法");

        processesLabel = new JLabel("进程数：");
        resourcesLabel = new JLabel("资源数：");
        allocationLabel = new JLabel("已分配矩阵：");
        maxLabel = new JLabel("最大需求矩阵：");
        availableLabel = new JLabel("可用资源数：");
        resultLabel = new JLabel("");

        processesField = new JTextField(5);
        resourcesField = new JTextField(5);
        availableField = new JTextField(5);

        runButton = new JButton("运行");
        runButton.addActionListener(this);
        resetButton = new JButton("重置");
        resetButton.addActionListener(this);

        inputPanel = new JPanel(new GridLayout(1, 4));
        inputPanel.add(processesLabel);
        inputPanel.add(processesField);
        inputPanel.add(resourcesLabel);
        inputPanel.add(resourcesField);

        allocationPanel = new JPanel();
        maxPanel = new JPanel();
        availablePanel = new JPanel(new GridLayout(1, 2));
        resultPanel = new JPanel();
        buttonPanel = new JPanel(new GridLayout(1, 2));

        frame.add(inputPanel, BorderLayout.NORTH);
        frame.add(allocationPanel, BorderLayout.WEST);
        frame.add(maxPanel, BorderLayout.EAST);
        frame.add(availablePanel, BorderLayout.SOUTH);
        frame.add(resultPanel, BorderLayout.CENTER);
        frame.add(buttonPanel, BorderLayout.SOUTH);

        frame.setSize(600, 400);
        frame.setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == runButton) {
            int n = Integer.parseInt(processesField.getText());
            int m = Integer.parseInt(resourcesField.getText());
            allocation = new int[n][m];
            max = new int[n][m];
            need = new int[n][m];
            available = new int[1][m];
            processes = new int[n];
            resources = new int[m];

            allocationPanel.removeAll();
            allocationPanel.setLayout(new GridLayout(n + 1, m + 1));
            allocationFields = new JTextField[n][m];
            allocationPanel.add(new JLabel(""));
            for (int j = 0; j < m; j++) {
                allocationPanel.add(new JLabel("资源 " + (j + 1)));
            }
            for (int i = 0; i < n; i++) {
                allocationPanel.add(new JLabel("进程 " + (i + 1)));
                for (int j = 0; j < m; j++) {
                    allocationFields[i][j] = new JTextField(5);
                    allocationPanel.add(allocationFields[i][j]);
                }
            }

            maxPanel.removeAll();
            maxPanel.setLayout(new GridLayout(n + 1, m + 1));
            maxFields = new JTextField[n][m];
            maxPanel.add(new JLabel(""));
            for (int j = 0; j < m; j++) {
                maxPanel.add(new JLabel("资源 " + (j + 1)));
            }
            for (int i = 0; i < n; i++) {
                maxPanel.add(new JLabel("进程 " + (i + 1)));
                for (int j = 0; j < m; j++) {
                    maxFields[i][j] = new JTextField(5);
                    maxPanel.add(maxFields[i][j]);
                }
            }

            available[0] = new int[m];
            String[] availableValues = availableField.getText().split(",");
            for (int i = 0; i < m; i++) {
                available[0][i] = Integer.parseInt(availableValues[i]);
            }

            for (int i = 0; i < n; i++) {
                processes[i] = i;
                for (int j = 0; j < m; j++) {
                    allocation[i][j] = Integer.parseInt(allocationFields[i][j].getText());
                    max[i][j] = Integer.parseInt(maxFields[i][j].getText());
                    need[i][j] = max[i][j] - allocation[i][j];
                }
            }

            for (int i = 0; i < m; i++) {
                resources[i] = 0;
                for (int j = 0; j < n; j++) {
                    resources[i] += allocation[j][i];
                }
                available[0][i] -= resources[i];
            }

            if (isSafeState(n, m)) {
                resultLabel.setText("系统处于安全状态！");
            } else {
                resultLabel.setText("系统处于不安全状态！");
            }
        } else if (e.getSource() == resetButton) {
            processesField.setText("");
            resourcesField.setText("");
            availableField.setText("");
            allocationPanel.removeAll();
            maxPanel.removeAll();
            resultLabel.setText("");
        }
    }

    public boolean isSafeState(int n, int m) {
        int[][] work = new int[1][m];
        for (int i = 0; i < m; i++) {
            work[0][i] = available[0][i];
        }
        boolean[] finish = new boolean[n];
        for (int i = 0; i < n; i++) {
            finish[i] = false;
        }
        int count = 0;
        while (count < n) {
            boolean found = false;
            for (int i = 0; i < n; i++) {
                if (!finish[i]) {
                    boolean notEnoughResources = false;
                    for (int j = 0; j < m; j++) {
                        if (need[i][j] > work[0][j]) {
                            notEnoughResources = true;
                            break;
                        }
                    }
                    if (!notEnoughResources) {
                        for (int j = 0; j < m; j++) {
                            work[0][j] += allocation[i][j];
                        }
                        finish[i] = true;
                        found = true;
                        count++;
                    }
                }
            }
            if (!found) {
                return false;
            }
        }
        return true;
    }

    public static void main(String[] args) {
        new BankerAlgorithm();
    }
}

这个界面包括了进程数、资源数、已分配矩阵、最大需求矩阵和可用资源数的输入框，以及运行和重置按钮。在输入数据后，点击运行按钮会调用 `isSafeState` 方法来判断系统是否处于安全状态，并在界面上显示结果。