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Java獲得當前系統記憶體情況的程式碼如下：

import java.lang.management.ManagementFactory; import com.sun.management.OperatingSystemMXBean; public class OSTest { public static void main(String[] args) { OperatingSystemMXBean osmb = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean(); System.out.println("系統實體記憶體總計：" + osmb.getTotalPhysicalMemorySize() / 1024/1024 + "MB"); System.out.println("系統物理可用記憶體總計：" + osmb.getFreePhysicalMemorySize() / 1024/1024 + "MB"); } }

ManagementFactory.getOperatingSystemMXBean()返回的是java.lang.management裡面的peratingSystemMXBean ；

我們要用的是com.sun.management.OperatingSystemMXBean;
在java類庫中可以查到：
public abstract Interface com.sun.management.OperatingSystemMXBean extends java.lang.management.OperatingSystemMXBean ，所以我們可以強制轉換一下。

硬碟使用：

import java.io.File; /** *//** * * jdk6.0下的磁碟使用情況例子 */ public class Diskfree { public static void main(String[] args) { File[] roots = File.listRoots();//獲取磁碟分割槽列表 for (File file : roots) { System.out.println(file.getPath()+"資訊如下:"); System.out.println("空閒未使用 = " + file.getFreeSpace()/1024/1024/1024+"G");//空閒空間 System.out.println("已經使用 = " + file.getUsableSpace()/1024/1024/1024+"G");//可用空間 System.out.println("總容量 = " + file.getTotalSpace()/1024/1024/1024+"G");//總空間 System.out.println(); } } }

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