如何在Java中监视计算机的CPU,内存和磁盘使用情况？

import com.sun.management.OperatingSystemMXBean;

public class CpuUsage {
    public static void main(String[] args) {
        OperatingSystemMXBean osBean = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();
        double cpuLoad = osBean.getSystemCpuLoad();
        System.out.println("CPU Load: " + cpuLoad);
    }
}

import java.lang.management.ManagementFactory;
import java.lang.management.MemoryMXBean;
import java.lang.management.MemoryUsage;

public class MemoryUsage {
    public static void main(String[] args) {
        MemoryMXBean memoryMXBean = ManagementFactory.getMemoryMXBean();
        MemoryUsage heapMemoryUsage = memoryMXBean.getHeapMemoryUsage();
        MemoryUsage nonHeapMemoryUsage = memoryMXBean.getNonHeapMemoryUsage();

        System.out.println("Heap Memory Usage: " + heapMemoryUsage);
        System.out.println("Non-Heap Memory Usage: " + nonHeapMemoryUsage);
    }
}

import java.io.File;

public class DiskUsage {
    public static void main(String[] args) {
        File file = new File("/");
        long totalSpace = file.getTotalSpace();
        long freeSpace = file.getFreeSpace();
        long usableSpace = file.getUsableSpace();

        System.out.println("Total Space: " + totalSpace);
        System.out.println("Free Space: " + freeSpace);
        System.out.println("Usable Space: " + usableSpace);
    }
}