獲取JVM的運行環境

廢話不多說，直接上代碼、

public class Jvm{
    public static void main(String[] args){
        Map<String,String> map = System.getenv();
        Set<String> set = map.keySet();
        Iterator<String> iter = set.iterator();
        while(iter.hasNext()){
            String key = iter.next();
            String value = map.get(key);
            System.out.println(key+"->"+value);
        }
    }
}