How to get JVM parameters in java code

The examples are as follows:

MemoryMXBean memorymbean = ManagementFactory.getMemoryMXBean();  
  MemoryUsage usage = memorymbean.getHeapMemoryUsage();  
  System.out.println("INIT HEAP: " + usage.getInit());  
  System.out.println("MAX HEAP: " + usage.getMax());  
  System.out.println("USE HEAP: " + usage.getUsed());  
  System.out.println("\nFull Information:");  
  System.out.println("Heap Memory Usage: " 
  + memorymbean.getHeapMemoryUsage());  
  System.out.println("Non-Heap Memory Usage: " 
  + memorymbean.getNonHeapMemoryUsage());  
    
  List<String> inputArguments = ManagementFactory.getRuntimeMXBean().getInputArguments();  
  System.out.println("===================java options=============== "); 
  System.out.println(inputArguments); 
  
    
    
  System.out.println("=======================通过java来获取相关系统状态============================ "); 
  int i = (int)Runtime.getRuntime().totalMemory()/1024;//Java 虚拟机中的内存总量,以字节为单位 
  System.out.println("总的内存量 i is "+i); 
  int j = (int)Runtime.getRuntime().freeMemory()/1024;//Java 虚拟机中的空闲内存量 
  System.out.println("空闲内存量 j is "+j); 
  System.out.println("最大内存量 is "+Runtime.getRuntime().maxMemory()/1024); 
  
  System.out.println("=======================OperatingSystemMXBean============================ "); 
  OperatingSystemMXBean osm = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean(); 
//  System.out.println(osm.getFreeSwapSpaceSize()/1024); 
//  System.out.println(osm.getFreePhysicalMemorySize()/1024); 
//  System.out.println(osm.getTotalPhysicalMemorySize()/1024); 
    
  //获取操作系统相关信息 
  System.out.println("osm.getArch() "+osm.getArch()); 
  System.out.println("osm.getAvailableProcessors() "+osm.getAvailableProcessors()); 
  //System.out.println("osm.getCommittedVirtualMemorySize() "+osm.getCommittedVirtualMemorySize()); 
  System.out.println("osm.getName() "+osm.getName()); 
  //System.out.println("osm.getProcessCpuTime() "+osm.getProcessCpuTime()); 
  System.out.println("osm.getVersion() "+osm.getVersion()); 
  //获取整个虚拟机内存使用情况 
  System.out.println("=======================MemoryMXBean============================ "); 
  MemoryMXBean mm=(MemoryMXBean)ManagementFactory.getMemoryMXBean(); 
  System.out.println("getHeapMemoryUsage "+mm.getHeapMemoryUsage()); 
  System.out.println("getNonHeapMemoryUsage "+mm.getNonHeapMemoryUsage()); 
  //获取各个线程的各种状态，CPU 占用情况，以及整个系统中的线程状况 
  System.out.println("=======================ThreadMXBean============================ "); 
  ThreadMXBean tm=(ThreadMXBean)ManagementFactory.getThreadMXBean(); 
  System.out.println("getThreadCount "+tm.getThreadCount()); 
  System.out.println("getPeakThreadCount "+tm.getPeakThreadCount()); 
  System.out.println("getCurrentThreadCpuTime "+tm.getCurrentThreadCpuTime()); 
  System.out.println("getDaemonThreadCount "+tm.getDaemonThreadCount()); 
  System.out.println("getCurrentThreadUserTime "+tm.getCurrentThreadUserTime()); 
    
  //当前编译器情况 
  System.out.println("=======================CompilationMXBean============================ "); 
  CompilationMXBean gm=(CompilationMXBean)ManagementFactory.getCompilationMXBean(); 
  System.out.println("getName "+gm.getName()); 
  System.out.println("getTotalCompilationTime "+gm.getTotalCompilationTime()); 
    
  //获取多个内存池的使用情况 
  System.out.println("=======================MemoryPoolMXBean============================ "); 
  List<MemoryPoolMXBean> mpmList=ManagementFactory.getMemoryPoolMXBeans(); 
  for(MemoryPoolMXBean mpm:mpmList){ 
    System.out.println("getUsage "+mpm.getUsage()); 
    System.out.println("getMemoryManagerNames "+mpm.getMemoryManagerNames().toString()); 
  } 
  //获取GC的次数以及花费时间之类的信息 
  System.out.println("=======================MemoryPoolMXBean============================ "); 
  List<GarbageCollectorMXBean> gcmList=ManagementFactory.getGarbageCollectorMXBeans(); 
  for(GarbageCollectorMXBean gcm:gcmList){ 
    System.out.println("getName "+gcm.getName()); 
    System.out.println("getMemoryPoolNames "+gcm.getMemoryPoolNames()); 
  } 
  //获取运行时信息 
  System.out.println("=======================RuntimeMXBean============================ "); 
  RuntimeMXBean rmb=(RuntimeMXBean)ManagementFactory.getRuntimeMXBean(); 
  System.out.println("getClassPath "+rmb.getClassPath()); 
  System.out.println("getLibraryPath "+rmb.getLibraryPath()); 
  System.out.println("getVmVersion "+rmb.getVmVersion());

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