Java – How to connect to oracle server in java

I am trying to connect to my friends Oracle server. But while connection I am getting error please help…..

JDBC code

Class.forName(oracle.jdbc.driver.OracleDriver).newInstance();
conn=DriverManager.getConnection(jdbc:oracle:thin:@<IPaddress>:<SID>,userName,password);
conn.close();

Error Message

java.sql.SQLException: The Network Adapter could not establish the connection
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:412)
at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:531)
at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:221)
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:32)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:503)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at com.wipro.sample.min.main(min.java:28)

    Caused by: oracle.net.ns.NetException: The Network Adapter could not establish the connection
   at oracle.net.nt.ConnStrategy.execute(ConnStrategy.java:359)
   at oracle.net.resolver.AddrResolution.resolveAndExecute(AddrResolution.java:422)
   at oracle.net.ns.NSProtocol.establishConnection(NSProtocol.java:672)
   at oracle.net.ns.NSProtocol.connect(NSProtocol.java:237)
   at oracle.jdbc.driver.T4CConnection.connect(T4CConnection.java:1042)
   at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:301)
   ... 7 more

    Caused by: java.net.ConnectException: Connection refused: connect
   at java.net.PlainSocketImpl.socketConnect(Native Method)
   at java.net.PlainSocketImpl.doConnect(Unknown Source)
   at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
   at java.net.PlainSocketImpl.connect(Unknown Source)
   at java.net.SocksSocketImpl.connect(Unknown Source)
   at java.net.Socket.connect(Unknown Source)
   at oracle.net.nt.TcpNTAdapter.connect(TcpNTAdapter.java:141)
   at oracle.net.nt.ConnOption.connect(ConnOption.java:123)
   at oracle.net.nt.ConnStrategy.execute(ConnStrategy.java:337)
   ... 12 more