Comments on: Compile and run Java program in package from command line

By: subbaraman ramaswamy

subbaraman ramaswamy — Wed, 22 Jun 2022 11:26:23 +0000

In reply to Ngo Alalibo. How to download the java compiler with jdk and jre having same versions and to run java programs in command line by setting the path?

By: EPAPHRAS

EPAPHRAS — Mon, 30 May 2022 22:21:16 +0000

Thanks a lot to ALL TEAM, this tutorial help me to understand all I want.

By: Michael Lueck

Michael Lueck — Fri, 09 Jul 2021 02:59:49 +0000

Thank you for the hint I needed this evening to get “Hello World!” to run built with Eclipse. The Eclipse tutorials all stated to “best practice” put your Java source within a Package. They never explained how that would make things more complicated to run the resulting Java program.

In my case, I needed to have the current directory be just the bin directory… not where the .class file actually is.
Then execute command line: java com.g2.ExecJar.Start Per your example.

Now I can get a good night’s rest, and not have my mind thinking of things to try to get the Eclipse produced .class file to actually run with Java from the command line. Phew!!

By: Ngo Alalibo

Ngo Alalibo — Mon, 20 Jan 2020 18:51:13 +0000

thank you. Had been trying to do this for several hours until I read your post. You’re right here “…However there are users who frequently works on eclipse, netbeans or any other IDE and don’t know that how the program actually works behind the IDE…. “

By: Lourthu

Lourthu — Tue, 17 Dec 2019 06:40:56 +0000

In reply to Anonymous. yes its working by the way you said..but what should i have to do the class files are in the same package where he classes are stored. bcz i'm having two classes with in com.example.payroll. the first class employee.java has compiled successfully but when i try to compile Test.java which has initialization of an object employee class shows cannot find symbol error i don't know what is the reason here.

By: sahana

sahana — Sat, 14 Apr 2018 08:48:25 +0000

please give me solution sir

By: sahana

sahana — Sat, 14 Apr 2018 08:45:41 +0000

sir how to run this
import java.net.*;
import java.io.*;
import java.sql.*;
class trainserver
{
public static void main(String args[])
{
String Query;
ResultSet rs = null;
String msg;
int pnr = 0,trainnum=0;
String from = new String();
String to = new String();
String date = new String();
String name = new String();
try
{
ServerSocket ser=new ServerSocket(8000);
System.out.println(“Server Started…”);
Socket soc=null;
soc=ser.accept();
System.out.println(“Received Connection: “+soc.getInetAddress().getHostAddress());
DataOutputStream out=new DataOutputStream(soc.getOutputStream());
BufferedReader in = new BufferedReader(new InputStreamReader(soc.getInputStream()));
try{
Class.forName(“sun.jdbc.odbc.JdbcOdbcDriver”);
Connection conn=DriverManager.getConnection(“jdbc:odbc:mydb”,”scott”,”tiger”);
Statement stmt=conn.createStatement();
msg = in.readLine();
pnr = Integer.parseInt(msg);
Query = “Select * from train where pnrno = “+pnr;
rs = stmt.executeQuery(Query);
if(rs.next())
{
pnr = Integer.parseInt(rs.getString(1));
from = rs.getString(2);
to = rs.getString(3);
date = rs.getString(4);
name = rs.getString(5);
trainnum=Integer.parseInt(rs.getString(6));
}
else
{
System.out.println(“invalid PNRNO”);
}
}
catch(SQLException e)
{
System.out.println(“Error Caught: “+e);
}
out.writeBytes(“”.valueOf(pnr));
out.write(10);
out.writeBytes(from);
out.write(10);
out.writeBytes(to);
out.write(10);
out.writeBytes(date);
out.write(10);
out.writeBytes(name);
out.write(10);
out.writeBytes(“”.valueOf(trainnum));
out.write(10);
soc.close();
}
catch(Exception e)
{
System.out.println(“Error Caught: “+e);
}
}
}
//Client side

class traindbclient
{
public static void main(String args[])
{
Socket objclient= null;
BufferedReader br = null,in = null;
DataOutputStream out = null;
int pnr = 0;
try
{
objclient = new Socket(“Localhost”,8000);
in = new BufferedReader(new InputStreamReader(objclient.getInputStream()));
br = new BufferedReader(new InputStreamReader(System.in));
out = new DataOutputStream(objclient.getOutputStream());
System.out.println(“Enter the PNR NO: “);
pnr = Integer.parseInt(br.readLine());
out.flush();
out.writeBytes(“”.valueOf(pnr));
out.write(10);
System.out.println(“PNRNo: “+in.readLine());
System.out.println(“SOURCE : “+in.readLine());
System.out.println(“DESTINATION: “+in.readLine());
System.out.println(“JOURNEY DATE: “+in.readLine());
System.out.println(“CUSTOMER NAME: “+in.readLine());
System.out.println(“TRAIN NO: “+in.readLine());
objclient.close();
}
catch(Exception e)
{
System.out.println(“Error Caught: “+e);
}
}
}

By: Govindarajan D

Govindarajan D — Sun, 06 Sep 2015 19:06:00 +0000

Thanks 🙂

By: Aalsi Procrastinatior

Aalsi Procrastinatior — Wed, 08 Oct 2014 13:38:00 +0000

You are a life saver man! Thanks a ton 🙂

By: winnersravi meena

winnersravi meena — Wed, 03 Sep 2014 17:35:00 +0000

if i change the package name of Start.java then how to run it