Oracle连接数据库,结果有点奇怪?

Java code:

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class JDBCTest {

/**
* @param args
*/
private Connection con = null;
static{
try{
Class.forName ("oracle.jdbc.driver.OracleDriver");
System.out.println("数据库加载成功");
}
catch(Exception e)
{
System.out.println("数据库加载失败");
}
}
public Connection getConnection()
{
try{
con=DriverManager.getConnection("jdbc:oracle:thin:@59.70.129.153:1521:orcl", "scott", "tiger");
}
catch(SQLException ex)
{
ex.printStackTrace();
}
return con;
}
public void isConnection()
{
if(con!=null)
{
System.out.println("数据库连接成功");
}
else{
System.out.println("数据库连接失败");
}
}
public static void main(String[] args) {
// TODO Auto-generated method stub
JDBCTest jdbc=new JDBCTest();
/*try {
Connection conn=DriverManager.getConnection("jdbc:oracle:thin:@59.70.129.153:1521:orcl", "scott", "tiger");
S