ConnectMSSQLServer sqlConnect = new ConnectMSSQLServer();
       sqlConnect.dbConnect("jdbc:sqlserver://192.168.25.115:1433;databaseName=arm",
              "arm", "1q2w3e4r!");

private Connection connection = null;

public Connection getConnection() {
  try {
    if ( connection.isClosed() ) {
      // Start afresh.
      connection = null;
    }
    // ** More tests here to check connection is ok.
    if (connection == null) {
      // Make a new connection.
      connection = Connections.getConnection(alias);
    }
  } catch (SQLException ex) {
    // Cause a NPE further down the line.
    connection = null;
  }
  return connection;
}

private Connection getConnection() {
       try {
           if (connection != null) {
               if (connection.isClosed() || !connection.isValid(10000)) {
                  connection = Connections.getConnection(alias);
               }

 */
package connection;

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

/**
 *

 */
public class anotherConnection {
    
    private Connection conn = null;
    
    public anotherConnection(String db_connect_string, String db_userid, String db_password) throws ClassNotFoundException{
        
        try {
         Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
     
         conn = DriverManager.getConnection(db_connect_string,
                  db_userid, db_password);
        
         } catch (Exception e) {
         
             e.printStackTrace();
      
         }
}
    
   public Connection getanotherConnection(String db_connect_string, String db_userid, String db_password) throws SQLException{
       if(!conn.isValid(10)){
            conn = DriverManager.getConnection(db_connect_string,
                  db_userid, db_password);
       }
    return conn;
}
       
   
   public void CloseConnection() throws SQLException{
       
       this.conn.close();
   }
   

 private void jMenuItem1ActionPerformed(java.awt.event.ActionEvent evt) {                                           

       ConnectMSSQLServer sqlConnect = new ConnectMSSQLServer();
       sqlConnect.dbConnect("jdbc:sqlserver://192.168.25.115:1433;databaseName=arm366",
              "arm", "1q2w3e4r!");
       
       
// TODO add your handling code here:
    }