Classe para exibir a Memória RAM do Sistema

public class MemoriaRAM {
    private static com.sun.management.OperatingSystemMXBean mxbean;
   
    static {
        mxbean = (com.sun.management.OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();
    }
   
    public String getStringRAM(){
        String ram = getMemoriaLivreBytes() + "#";
        ram += getMemoriaLivreKBytes() + "#";
        ram += getMemoriaLivreMBytes() + "#";
        ram += getMemoriaLivreGBytes();
        return ram;
    }
   
    public static long getMemoriaTotalBytes(){
        return mxbean.getTotalPhysicalMemorySize();
    }
   
    public static long getMemoriaTotalKBytes(){
        return mxbean.getTotalPhysicalMemorySize()/1024;
    }
   
    public static long getMemoriaTotalMBytes(){
        return Math.round(mxbean.getTotalPhysicalMemorySize()/1024/1024);
    }
   
    public static long getMemoriaTotalGBytes(){
        return Math.round(mxbean.getTotalPhysicalMemorySize()/1024/1024/1024);
    }
   
    public static long getMemoriaLivreBytes(){
        return mxbean.getFreePhysicalMemorySize();
    }
   
    public static long getMemoriaLivreKBytes(){
        return mxbean.getFreePhysicalMemorySize()/1024;
    }
   
    public static long getMemoriaLivreMBytes(){
        return mxbean.getFreePhysicalMemorySize()/1024/1024;
    }
   
    public static long getMemoriaLivreGBytes(){
        return mxbean.getFreePhysicalMemorySize()/1024/1024/1024;
    }

    public static OperatingSystemMXBean getMxbean() {
        return mxbean;
    }
}