java进程调度设计与实现_java实现模拟进程调度过程(操作系统)

Java的进程调度设计与实现可以采用多种方法，下面介绍一种实现模拟进程调度过程的方法。

1. 定义进程类

首先定义一个Process类，包含进程的ID、优先级、状态等属性。

public class Process {
    private int pid; // 进程ID
    private int priority; // 优先级
    private int status; // 状态：0-就绪，1-运行，2-阻塞

    public Process(int pid, int priority) {
        this.pid = pid;
        this.priority = priority;
        this.status = 0; // 初始状态为就绪
    }

    public int getPid() {
        return pid;
    }

    public int getPriority() {
        return priority;
    }

    public int getStatus() {
        return status;
    }

    public void setStatus(int status) {
        this.status = status;
    }
}

2. 定义进程管理类

定义一个ProcessManager类，用于管理进程的创建、删除和调度等操作。

import java.util.ArrayList;
import java.util.List;

public class ProcessManager {
    private List<Process> processList; // 进程列表

    public ProcessManager() {
        processList = new ArrayList<>();
    }

    // 创建进程
    public void createProcess(int pid, int priority) {
        Process process = new Process(pid, priority);
        processList.add(process);
    }

    // 删除进程
    public void deleteProcess(int pid) {
        for (Process process : processList) {
            if (process.getPid() == pid) {
                processList.remove(process);
                break;
            }
        }
    }

    // 进程调度
    public Process schedule() {
        Process selectedProcess = null;
        int maxPriority = Integer.MIN_VALUE;

        // 选择优先级最高的就绪进程
        for (Process process : processList) {
            if (process.getStatus() == 0 && process.getPriority() > maxPriority) {
                selectedProcess = process;
                maxPriority = process.getPriority();
            }
        }

        // 将原来的运行进程设置为就绪状态
        for (Process process : processList) {
            if (process.getStatus() == 1) {
                process.setStatus(0);
                break;
            }
        }

        // 将选中的就绪进程设置为运行状态
        if (selectedProcess != null) {
            selectedProcess.setStatus(1);
        }

        return selectedProcess;
    }
}

3. 测试进程调度

public class Test {
    public static void main(String[] args) {
        ProcessManager processManager = new ProcessManager();

        // 创建进程
        processManager.createProcess(1, 3);
        processManager.createProcess(2, 1);
        processManager.createProcess(3, 2);

        // 进程调度
        Process selectedProcess = processManager.schedule();
        System.out.println("Selected Process: " + selectedProcess.getPid());

        // 删除进程
        processManager.deleteProcess(1);

        // 进程调度
        selectedProcess = processManager.schedule();
        System.out.println("Selected Process: " + selectedProcess.getPid());
    }
}

输出结果为：

Selected Process: 1
Selected Process: 3

说明进程调度成功。