ManualHistogram.java

public void memoryHistogram() {
    String name = ManagementFactory.getRuntimeMXBean().getName();
    String PID = name.substring(0, name.indexOf("@"));
    Process p = Runtime.getRuntime().exec("jcmd " + PID + " GC.class_histogram");
    try (BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()))) {
        input.lines().forEach(System.out::println);
    }
}

public void memoryAnalysis(){
    memoryHistogram();
    Object instance = codeThatCreatesComplexDataStructure();
    memoryHistogram();
}