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java.net.UnknownHostException: www.yahoo.com	at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:153)	at java.net.Socket.connect(Socket.java:426)	at java.net.Socket.connect(Socket.java:376)	at sun.net.NetworkClient.doConnect(NetworkClient.java:139)	at sun.net.www.http.HttpClient.openServer(HttpClient.java:386)	at sun.net.www.http.HttpClient.openServer(HttpClient.java:602)	at sun.net.www.http.HttpClient.(HttpClient.java:303)	at sun.net.www.http.HttpClient.(HttpClient.java:264)	at sun.net.www.http.HttpClient.New(HttpClient.java:336)	at sun.net.www.http.HttpClient.New(HttpClient.java:317)	at sun.net.www.http.HttpClient.New(HttpClient.java:312)	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:481)	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:472)	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:574)	at undefined.Sample.main(Sample.java:12)