a way to record memory and time in java

recordmemory.java

    public static <T> void recordMemoryUsage(T count,Consumer<T> fn){
        Runtime runtime = Runtime.getRuntime();

        // Run the garbage collector
        runtime.gc();

        // Calculate the used memory
        long memory = runtime.totalMemory() - runtime.freeMemory();
        long startTime = System.nanoTime();
        System.out.println("Used memory before operation is: " + memory + " bytes");

        // Here run your function for which you want to check the memory usage

        fn.accept(count);
        // Run the garbage collector
        runtime.gc();


        // Calculate the used memory
        long memoryAfter = runtime.totalMemory() - runtime.freeMemory();
        System.out.println("Memory used by memoryafter operation is: " + (memoryAfter  ) + " bytes");
        System.out.println("Memory used by operation is: " + (memoryAfter - memory) + " bytes");
        long endTime = System.nanoTime();
        long elapsedTime = endTime - startTime;
        double seconds = (double)elapsedTime/1000000000;
        System.out.println("Elapsed time: " + seconds + " seconds");

    }