64位系统上可以给32位Jvm分配多少内存

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public class MaxMemory {
    public static void main(String[] args) {
        Runtime rt = Runtime.getRuntime();
        long totalMem = rt.totalMemory();
        long maxMem = rt.maxMemory();
        long freeMem = rt.freeMemory();
        double megs = 1048576.0;
        //总内存
        System.out.println ("Total Memory: " + totalMem + " (" + (totalMem/megs) + " MiB)");
        //最大分配内存
        System.out.println ("Max Memory:   " + maxMem + " (" + (maxMem/megs) + " MiB)");
        //空闲内存
        System.out.println ("Free Memory:  " + freeMem + " (" + (freeMem/megs) + " MiB)");
    }
}