Static final String DATABASE_URL="jdbc:mysql://localhost//testando";

java.sql.SQLException: Syntax error or access violation,  message from server: “Incorrect database name ‘/testando’”

at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:1977)

at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:1900)

at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:2471)

at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:813)

at com.mysql.jdbc.Connection.createNewIO(Connection.java:1771)

at com.mysql.jdbc.Connection.(Connection.java:440)

at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:400)

at java.sql.DriverManager.getConnection(Unknown Source)

at java.sql.DriverManager.getConnection(Unknown Source)

at com.mysql.jdbc.TesteConect.main(TesteConect.java:31)

/**
 * @author ticianne
 *
 */
package com.mysql.jdbc;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;

public class TesteConect {
	//driver e local do banco de dados
	static final String JDBC_DRIVER="com.mysql.jdbc.Driver";
	static final String DATABASE_URL="jdbc:mysql://localhost//testando";
	
	public static void main(String[] args) {
		Connection connection=null; //gerencia a conexao
		Statement statement =null; //instruçao para a consulta
		
		// conectar e consultar o banco
		try{
			Class.forName(JDBC_DRIVER);//carrega a classe do driver no  bd
			
			connection= DriverManager.getConnection(DATABASE_URL,"root","rootlar"); //faz a conexao
			
			statement=connection.createStatement(); //cria Statement para consulta
			
			ResultSet resultSet = statement.executeQuery("SELECT campo FROM teste"); //faz a busca
			
			ResultSetMetaData metaData = resultSet.getMetaData();
		      int ncolunas = metaData.getColumnCount();     
		      System.out.println( "Resultados da busca:" );
		      
		      for ( int i = 1; i <= ncolunas; i++ )
		         System.out.printf( "%-8s\t", metaData.getColumnName( i ));
		      System.out.println();
			
			
			for (int i=1;i<=ncolunas;i++){
				System.out.printf("\n %s \t",metaData.getColumnName(i));
			}
			//while (resultSet.next()){}
			
			
		}catch(SQLException sqle){
			sqle.printStackTrace();
			System.exit(1);
		}
		catch(ClassNotFoundException classex){
			classex.printStackTrace();
			System.exit(1);
		}
		finally {
			try{
				statement.close();
				connection.close();
			}catch(Exception e){
				e.printStackTrace();
				System.exit(1);
			}
			
		}
		
	}
}

return DriverManager.getConnection("jdbc:mysql://localhost:3306/testando", "usuario", "senha");