I have a Java program on a laptop which is trying to access an Oracle
XE Database on my desktop.

Here is the error I get...obviously there is something wrong with a
connection string or something but I don't know what it would be

Exception in thread "main" java.sql.SQLException: Io exception: The
Network Adapter could not establish the connection
    at
oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:111)
    at
oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:145)
    at
oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:254)
    at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:386)
    at
oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:419)
    at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:164)
    at
oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:34)
    at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:752)
    at java.sql.DriverManager.getConnection(DriverManager.java:525)
    at java.sql.DriverManager.getConnection(DriverManager.java:171)
    at Oracle.OracleTest.main(OracleTest.java:12)

And here is my source

package Oracle;

import java.lang.*;
import java.util.*;
import java.sql.*;

class OracleTest {
 public static void main (String args []) throws SQLException
 {
       DriverManager.registerDriver (new
oracle.jdbc.driver.OracleDriver());

       Connection conn = DriverManager.getConnection
            ("jdbc:oracle:thin:@emily5:1521:XE", "xxxxxx", "######"");
                            // @machineName:port:SID,   userid,
password

       Statement stmt = conn.createStatement();
       ResultSet rset = stmt.executeQuery("select * from books");
       while (rset.next())
       {
           int index = 1;
               while (index <= 7)
               {
                       System.out.print (rset.getString(index) + " ");
                   index++;
               }
               System.out.println ("");
       }
       stmt.close();

 }
}

The program compiles and I have the odbc jar on the class path.