import java.sql.*;

public class Main {
public static void main(String[] args) {
// string de conexão...usando Windows Authentication
String connectionUrl = "jdbc:sqlserver://localhost:1433;" +
  "databaseName=JAVA;integratedSecurity=true;";

try {
  Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver").newInstance();
  Connection conn = DriverManager.getConnection(connectionUrl);
  System.out.println("Conexão obtida com sucesso.");
}
catch (SQLException ex) {
  System.out.println("SQLException: " + ex.getMessage());
  System.out.println("SQLState: " + ex.getSQLState());
  System.out.println("VendorError: " + ex.getErrorCode());
}
catch (Exception e) {

  System.out.println("erro ao conectar com o banco de dados: " + e);
  }
 }
}

String connectionUrl= jdbc://sqlserver:Joy\sqlexpress;databaseName=JAVA;integratedSecurity=true;"