打印JAVA虚拟机的系统属性

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

public class Test {
	public static void main(String[] args) 
	 {
	  Properties p = System.getProperties();
	  Enumeration e = p.propertyNames();
	  while(e.hasMoreElements())
	  {
	   String key = (String)e.nextElement();
	   System.out.println(key + "=" + p.getProperty(key));
	  }

	 }
}