output.log

Maximum number of objects simultaneously allocated: 10000000
Max memory: 16MB
Max used memory: 11MB
Max free memory: 11MB
Total Time: 9 secconds

TestGC.java

public class Test {
    static int objectCount = 0;

    public static int getObjectCount() {
        return objectCount;
    }

    public Test() {
        objectCount++;
    }

    @Override
    public void finalize() {
        // objectCount--;
    }

    public static void main(String[] args) {
        int maxObjects = 0;
        long maxMemory = 0;
        long maxUsedMemory = 0;
        long maxFreeMemory = 0;
        long memory = 0;
        long usedMemory = 0;
        long freeMemory = 0;

        final long t0 = System.currentTimeMillis();
        Test test = null;
        for (int i = 0; i < 10000000; i++) {
//            System.gc();
            test = new Test();

            memory = Runtime.getRuntime().totalMemory();
            freeMemory = Runtime.getRuntime().freeMemory();
            usedMemory = memory - freeMemory;

            if (maxMemory < memory) {
                maxMemory = memory;
            }
            if (maxFreeMemory < freeMemory) {
                maxFreeMemory = freeMemory;
            }
            if (maxUsedMemory < usedMemory) {
                maxUsedMemory = usedMemory;
            }

            if (maxObjects < getObjectCount()) {
                maxObjects = getObjectCount();
            }
        }
        final long t1 = System.currentTimeMillis();

        System.out.println(
                "Maximum number of objects simultaneously allocated: " + maxObjects);
        System.out.println("Max memory: " + maxMemory / 1024 / 1024 + "MB");
        System.out.println("Max used memory: " + maxUsedMemory / 1024 / 1024 + "MB");
        System.out.println("Max free memory: " + maxFreeMemory / 1024 / 1024 + "MB");
        System.out.println("Total Time: " + (t1 - t0) / 60 + " secconds");
    }
}