java Java MaxMemory

Posted 2021-05-08

// See my answer to Stack Overflow: Maximum java heap size of a 32-bit JVM on a 64-bit host
// http://stackoverflow.com/questions/1434779/maximum-java-heap-size-of-a-32-bit-jvm-on-a-64-bit-os/7019624#7019624
// and my blog:  http://milosophical.me/blog/2007/03/04/32-bit-windows-and-jvm-virtual-memory-limit.html

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;

        System.out.println ("Total Memory: " + totalMem + " (" + (totalMem/megs) + " MiB)");
        System.out.println ("Max Memory:   " + maxMem + " (" + (maxMem/megs) + " MiB)");
        System.out.println ("Free Memory:  " + freeMem + " (" + (freeMem/megs) + " MiB)");
    }
}