java获得JVM可能的总内存，最大内存，以及空闲内存，javajvm,要获得jvm相关的内存信

java获得JVM可能的总内存，最大内存，以及空闲内存，javajvm,要获得jvm相关的内存信

要获得jvm相关的内存信息，需要使用Runtime类的totalMemory(), maxMemory() 和 freeMemory()方法。

import java.text.DecimalFormat;/** * Main.java * * @author byrx.net */public class Main {    /**     * Displays the total amount of memory, the maximal amount of memory     * and the total amount of free memory in the Java Virtual Machine.     */    public void displayAvailableMemory() {        DecimalFormat df = new DecimalFormat("0.00") ;        //Display the total amount of memory in the Java virtual machine.        long totalMem = Runtime.getRuntime().totalMemory();        System.out.println(df.format(totalMem 1000000F) + " MB");        //Display the maximum amount of memory that the Java virtual machine will attempt to use.        long maxMem = Runtime.getRuntime().maxMemory();        System.out.println(df.format(maxMem 1000000F) + " MB");        //Display the amount of free memory in the Java Virtual Machine.        long freeMem = Runtime.getRuntime().freeMemory();        System.out.println(df.format(freeMem 1000000F) + " MB");    }    /**     * Starts the program     *     * @param args the command line arguments     */    public static void main(String[] args) {        new Main().displayAvailableMemory();    }}

可能的输出如下：

2,03 MB66,65 MB1,82 MB