JAVA 시스템 환경읽어오기

import java.util.Enumeration;
import java.util.Properties;


public class GetRuntimeInfo {
    private void getRuntimeInformation(){
        Properties properties = null;
       
        try{
            properties = System.getProperties();
        }catch(Exception e){
            e.printStackTrace();
        }
       
        Enumeration en = properties.propertyNames();
        while(en.hasMoreElements()){
            String s = (String)en.nextElement();
            String stringValue = properties.getProperty(s);
            System.out.println(s + " : " + stringValue);           
        }
    }
   
    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        new GetRuntimeInfo().getRuntimeInformation();
    }
}