用Java图形化实现进程调度

Java图形化实现进程调度需要借助GUI库，如Swing或JavaFX。下面以JavaFX为例，介绍如何实现进程调度的图形化界面。

1. 定义进程类：与上面介绍的一样，定义进程类，包括进程的名称、状态、优先级等信息。

public class Process {
    private String name;
    private int priority;
    private int state;
    // 其它属性和方法
}

2. 创建UI界面：使用JavaFX创建UI界面，包括进程列表、调度算法选择、开始、暂停、继续、停止等操作。

public class ProcessScheduler extends Application {
    private ProcessQueue processQueue;
    private Scheduler scheduler;
    private TableView<Process> processTable;
    private ComboBox<String> algorithmComboBox;
    private Button startButton;
    private Button pauseButton;
    private Button resumeButton;
    private Button stopButton;

    @Override
    public void start(Stage primaryStage) throws Exception {
        // 创建进程队列和调度器
        processQueue = new ProcessQueue();
        scheduler = new Scheduler(processQueue);

        // 创建UI界面
        BorderPane root = new BorderPane();
        root.setPadding(new Insets(10));

        // 进程列表
        processTable = new TableView<>();
        TableColumn<Process, String> nameColumn = new TableColumn<>("进程名称");
        nameColumn.setCellValueFactory(new PropertyValueFactory<>("name"));
        TableColumn<Process, Integer> priorityColumn = new TableColumn<>("优先级");
        priorityColumn.setCellValueFactory(new PropertyValueFactory<>("priority"));
        TableColumn<Process, String> stateColumn = new TableColumn<>("状态");
        stateColumn.setCellValueFactory(new PropertyValueFactory<>("state"));
        processTable.getColumns().addAll(nameColumn, priorityColumn, stateColumn);
        root.setCenter(processTable);

        // 调度算法选择
        algorithmComboBox = new ComboBox<>();
        algorithmComboBox.getItems().addAll("先来先服务", "短作业优先", "时间片轮转");
        algorithmComboBox.setValue("先来先服务");
        root.setTop(algorithmComboBox);

        // 开始、暂停、继续、停止按钮
        HBox buttonBox = new HBox(10);
        startButton = new Button("开始");
        startButton.setOnAction(event -> {
            scheduler.setAlgorithm(algorithmComboBox.getValue());
            scheduler.start();
        });
        pauseButton = new Button("暂停");
        pauseButton.setOnAction(event -> scheduler.pause());
        resumeButton = new Button("继续");
        resumeButton.setOnAction(event -> scheduler.resume());
        stopButton = new Button("停止");
        stopButton.setOnAction(event -> scheduler.stop());
        buttonBox.getChildren().addAll(startButton, pauseButton, resumeButton, stopButton);
        root.setBottom(buttonBox);

        // 显示界面
        Scene scene = new Scene(root, 400, 300);
        primaryStage.setScene(scene);
        primaryStage.show();
    }
}

3. 实现调度算法：根据不同的调度算法，实现对应的进程调度逻辑，如先来先服务、短作业优先、时间片轮转等算法。

public class Scheduler {
    private ProcessQueue processQueue;
    private String algorithm;
    private boolean running;
    private boolean paused;
    private Thread thread;

    public Scheduler(ProcessQueue processQueue) {
        this.processQueue = processQueue;
        algorithm = "先来先服务";
        running = false;
        paused = false;
    }

    public void setAlgorithm(String algorithm) {
        this.algorithm = algorithm;
    }

    public void start() {
        if (!running) {
            running = true;
            thread = new Thread(() -> {
                while (running) {
                    if (!paused) {
                        switch (algorithm) {
                            case "先来先服务":
                                fcfs();
                                break;
                            case "短作业优先":
                                sjf();
                                break;
                            case "时间片轮转":
                                rr();
                                break;
                        }
                    }
                    // 等待一段时间，模拟进程调度
                    try {
                        Thread.sleep(500);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            });
            thread.start();
        }
    }

    public void pause() {
        paused = true;
    }

    public void resume() {
        paused = false;
    }

    public void stop() {
        running = false;
    }

    // 先来先服务调度算法
    public void fcfs() {
        Process process = processQueue.getFirstArrivedProcess();
        if (process != null) {
            processQueue.removeProcess(process);
            process.setState(Process.RUNNING);
            runProcess(process);
            process.setState(Process.TERMINATED);
        }
    }

    // 短作业优先调度算法
    public void sjf() {
        Process process = processQueue.getShortestJobProcess();
        if (process != null) {
            processQueue.removeProcess(process);
            process.setState(Process.RUNNING);
            runProcess(process);
            process.setState(Process.TERMINATED);
        }
    }

    // 时间片轮转调度算法
    public void rr() {
        Process process = processQueue.getHighestPriorityProcess();
        if (process != null) {
            processQueue.removeProcess(process);
            process.setState(Process.RUNNING);
            runProcess(process);
            if (!process.isCompleted()) {
                process.setState(Process.READY);
                processQueue.addProcess(process);
            }
        }
    }

    // 模拟进程运行
    private void runProcess(Process process) {
        // 模拟进程运行，更新进程的运行时间和状态等信息
        // ...
    }
}

以上代码仅为示例，实际应用中还需要考虑更多的因素，如进程的同步、互斥等问题。