奇怪的异常： java.net.MalformedURLException: unknown protocol: https

我已经设置了 系统属性  为什么还有这个异常
System.setProperty("https.proxyHost","172.25.75.2");
System.setProperty("https.proxyPort","8080");URL url=new URL(https://www.sun.com);System.setProperty("java.protocol.handler.pkgs","com.sun.net.ssl.internal.www.protocol");
System.setProperty("javax.net.ssl.trustStore", "g:/cacerts");
System.setProperty("javax.net.ssl.trustStorePassword","changeit");请高手指教
谢谢先