java代码如何获取可用内存呢？
下文笔者通过示例的方式讲述java代码获取可用内存的方法分享，如下所示:
实现思路: 借助Runtime.getRuntime()类即可获取指定的信息例:
package com.java265.other;
import java.io.File;
public class Test11 {
/**
* java265.com 示例演示
*/
public static void main(String[] args) throws Exception {
/* Total number of processors or cores available to the JVM */
System.out.println("Available processors (cores): " + Runtime.getRuntime().availableProcessors());
/* Total amount of free memory available to the JVM */
System.out.println("Free memory (bytes): " + Runtime.getRuntime().freeMemory());
/* This will return Long.MAX_VALUE if there is no preset limit */
long maxMemory = Runtime.getRuntime().maxMemory();
/* Maximum amount of memory the JVM will attempt to use */
System.out.println("Maximum memory (bytes): " + (maxMemory == Long.MAX_VALUE ? "no limit" : maxMemory));
/* Total memory currently in use by the JVM */
System.out.println("Total memory (bytes): " + Runtime.getRuntime().totalMemory());
/* Get a list of all filesystem roots on this system */
File[] roots = File.listRoots();
/* For each filesystem root, print some info */
for (File root : roots) {
System.out.println("File system root: " + root.getAbsolutePath());
System.out.println("Total space (bytes): " + root.getTotalSpace());
System.out.println("Free space (bytes): " + root.getFreeSpace());
System.out.println("Usable space (bytes): " + root.getUsableSpace());
}
}
}
--------运行以上代码，将输出以下信息------
Available processors (cores): 8
Free memory (bytes): 264491200
Maximum memory (bytes): 4229955584
Total memory (bytes): 266338304
File system root: C:\
Total space (bytes): 161469165568
Free space (bytes): 29989670912
Usable space (bytes): 29989670912
File system root: D:\
Total space (bytes): 214748360704
Free space (bytes): 27861917696
Usable space (bytes): 27861917696
File system root: E:\
Total space (bytes): 128849014784
Free space (bytes): 109176647680
Usable space (bytes): 109176647680
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