public class StackTest {
    public static void main(String[] args) {
        //返回Java虚拟机中的堆内存总量
        long xmsMemory = Runtime.getRuntime().totalMemory() / 1024 / 1024;
        //返回Java虚拟机中使用的最大堆内存
        long xmxMemory = Runtime.getRuntime().maxMemory() / 1024 / 1024;
        System.out.println("-Xms:" + xmsMemory + "M");
        System.out.println("-Xmx:" + xmxMemory + "M");

    }
}