Thread: Run Time Error

Hello ! I Tanmay not java begineer Programmer.I have done more program on different
tools on jdk1.6 but when I uninstall this software & again installed the jdk new version jdk1.7.0_03
on my computer.

When I compile the Program on command Prompt then my Program was compile but when I did run it on
command prompt then I got the error.So I am just showing' my command prompt details are given below :

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\Tanmay Sinha>d:

D:\>cd D:\Tanmay Java Programs\Core Java codes

D:\Tanmay Java Programs\Core Java codes>javac Program1.java

D:\Tanmay Java Programs\Core Java codes>java Program1
Error: Could not find or load main class Program1

D:\Tanmay Java Programs\Core Java codes>

Please reply me......

Does the program have a package statement?
If so you must consider it when using the java command.
For simple program testing, comment out the package statement and try again.

And make sure you don't have wretched CLASSPATH variable hanging about.

javac -cp . Program1.java
java -cp . Program1

The dash-cp-space-dot ensures that the current directory will be the classpath that the Java executable tools use.

Make sure that you have this line : public static void main(String args[]) after the class program1.
Also make sure that your file name should be program1.java

Yes I wrote my code is given below :-

class Prg1
{
public static void main(String args[])
{
System.out.println("HelloWorld");
}
}

I have saved it by "Prg1.java" & aalso I compited it but getting the run time error Could not find or load main class Program1.

No... no package statements are used on the Program.Tell me briefly with examples.

Yes I wrote my code is given below :-

class Prg1
{
public static void main(String args[])
{
System.out.println("HelloWorld");
}
}

I have saved it by "Prg1.java" & aalso I compited it but getting the run time error Could not find or load main class Program1.

Could not find or load main class Program1.

Where is the class Program1?
The code you posted has a class named: Prg1

You should use that name when executing the java command: java Prg1

Originally Posted by Norm

Where is the class Program1?
The code you posted has a class named: Prg1

You should use that name when executing the java command: java Prg1

I created a new folder Tanmay Java Programs & written a code shifted into another folder name Core Java Codes (D:\Tanmay Java Programs\Core Java codes).
I used that name when excuting the java program as :

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\Tanmay Sinha>d:

D:\>cd D:\Tanmay Java Programs\Core Java codes

D:\Tanmay Java Programs\Core Java codes>javac Prg1.java

D:\Tanmay Java Programs\Core Java codes>java Prg1
Error: Could not find or load main class Prg1

This is the Error.I have shown it in detail.Plz help me coz I have to do the project on java....
When I installed the java Program[(jdk-7u3-windows-i586) java SE Development Kit 7 windows X86)
on my machine(Window XP Service Pack2) then after installation I looked Java folder in C-Drive
(C:\Program Files\Java),In c Drive there are 2 folders available One is jdk1.7.0_03 and other is
jre7.I used jdk1.7.0_03 & open its bin folder & then copy the Address of the bin as
C:\Program Files\Java\jdk1.7.0_03\bin.Again I used right click on My Computer,Open properties,
select Advance,Select Environment Variable then I looked the two options user variables for Tanmay Sinha and other is System variables,In System variables I choose Path & double click on Edit option ,After that
showing other window Edit System Variable.In Edit System Variable typed Path at Variable name and
at Variable value I paste the jdk bin folder
C:\Program Files\Java\jdk1.7.0_03\bin
then use ok.....
After that I did program on command prompt & after successfull compilation I get error
Error: Could not find or load main class Prg1.

When I installed (jdk-7u3-windows-i586) java SE Development Kit 7 windows X86) on my machine then I also looked the other folder in c-drive(C:\Program Files\Oracle).In this folder there are 2 folders one is JavaFX 2.0 Runtime and other is JavaFX 2.0 SDK.
Now hopefully u'll get the all information about java & solve my Problem easily.

I created a new folder Tanmay Java Programs & written a code shifted into another folder name Core Java Codes (D:\Tanmay Java Programs\Core Java codes).
I used that name when excuting the java program as :

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\Tanmay Sinha>d:

D:\>cd D:\Tanmay Java Programs\Core Java codes

D:\Tanmay Java Programs\Core Java codes>javac Prg1.java

D:\Tanmay Java Programs\Core Java codes>java Prg1
Error: Could not find or load main class Prg1

This is the Error.I have shown it in detail.Plz help me coz I have to do the project on java....
When I installed the java Program[(jdk-7u3-windows-i586) java SE Development Kit 7 windows X86)
on my machine(Window XP Service Pack2) then after installation I looked Java folder in C-Drive
(C:\Program Files\Java),In c Drive there are 2 folders available One is jdk1.7.0_03 and other is
jre7.I used jdk1.7.0_03 & open its bin folder & then copy the Address of the bin as
C:\Program Files\Java\jdk1.7.0_03\bin.Again I used right click on My Computer,Open properties,
select Advance,Select Environment Variable then I looked the two options user variables for Tanmay Sinha and other is System variables,In System variables I choose Path & double click on Edit option ,After that
showing other window Edit System Variable.In Edit System Variable typed Path at Variable name and
at Variable value I paste the jdk bin folder
C:\Program Files\Java\jdk1.7.0_03\bin
then use ok.....
After that I did program on command prompt & after successfull compilation I get error
Error: Could not find or load main class Prg1.

When I installed (jdk-7u3-windows-i586) java SE Development Kit 7 windows X86) on my machine then I also looked the other folder in c-drive(C:\Program Files\Oracle).In this folder there are 2 folders one is JavaFX 2.0 Runtime and other is JavaFX 2.0 SDK.
Now hopefully u'll get the all information about java & solve my Problem easily.

Hey ! Man.....I am getting this Error first time......I still confuse because when my code does not run but why compiling process is successfully working on command prompt???????????

The OS is finding the javac and the java commands. Otherwise there'd be error messages.
The javac command did not give an error. What .class files are there in the Core Java codes folder?
Do a dir command in that folder to list its contents.

Prg1.class is a class file in the Core Java codes folder.
yes..

Can you post what is shown in a command prompt for the dir command and the java command.

I can't find a way to generate the error message you show when using the java command:
Error: Could not find or load main class Prg1

ok..

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\Tanmay Sinha>d:

D:\>cd D:\Tanmay Java Programs\Core Java codes

D:\Tanmay Java Programs\Core Java codes>javac Prg1.java

D:\Tanmay Java Programs\Core Java codes>java Prg1
Error: Could not find or load main class Prg1

D:\Tanmay Java Programs\Core Java codes>

Where is the dir command output?
Also enter: java -version

Also show the contents of the Prg1.java file

I have compile & run the java codes on command prompt through that way I have sent u to showing detail....

If you don't run the commands I asked for and post the contents of the command prompt window when you are done, I can't help you. I'm here and you are there with your PC. The only way I can see anything from your PC is if you copy and paste it on the forum.
I want to see all of it in one posting.

I created a new folder Tanmay Java Programs & written a code shifted into another folder name Core Java Codes (D:\Tanmay Java Programs\Core Java codes).
I used that name when excuting the java program as :

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\Tanmay Sinha>d:

D:\>cd D:\Tanmay Java Programs\Core Java codes

D:\Tanmay Java Programs\Core Java codes>javac Prg1.java

D:\Tanmay Java Programs\Core Java codes>java Prg1
Error: Could not find or load main class Prg1

This is the Error.I have shown it in detail.Plz help me coz I have to do the project on java....
When I installed the java Program[(jdk-7u3-windows-i586) java SE Development Kit 7 windows X86)
on my machine(Window XP Service Pack2) then after installation I looked Java folder in C-Drive
(C:\Program Files\Java),In c Drive there are 2 folders available One is jdk1.7.0_03 and other is
jre7.I used jdk1.7.0_03 & open its bin folder & then copy the Address of the bin as
C:\Program Files\Java\jdk1.7.0_03\bin.Again I used right click on My Computer,Open properties,
select Advance,Select Environment Variable then I looked the two options user variables for Tanmay Sinha and other is System variables,In System variables I choose Path & double click on Edit option ,After that
showing other window Edit System Variable.In Edit System Variable typed Path at Variable name and
at Variable value I paste the jdk bin folder
C:\Program Files\Java\jdk1.7.0_03\bin
then use ok.....
After that I did program on command prompt & after successfull compilation I get error
Error: Could not find or load main class Prg1.

When I installed (jdk-7u3-windows-i586) java SE Development Kit 7 windows X86) on my machine then I also looked the other folder in c-drive(C:\Program Files\Oracle).In this folder there are 2 folders one is JavaFX 2.0 Runtime and other is JavaFX 2.0 SDK.
Now hopefully u'll get the all information about java & solve my Problem easily.

I have sent the all detail...

You are repeating yourself. I asked that you do a dir command and a java -version command when you do the other commands.

Can you do those extra commands and post the output here?
If you don't have a PC that you can use, don't waste my time by copying old posts. I would like the output from a new test. Otherwise come back later when you can do that.

Originally Posted by Norm

You are repeating yourself. I asked that you do a dir command and a java -version command when you do the other commands.

Can you do those extra commands and post the output here?
If you don't have a PC that you can use, don't waste my time by copying old posts. I would like the output from a new test. Otherwise come back later when you can do that.

Hey ! Man,I did format my machine since i was getting more terrible thing due to java run time error after compilation.Now I installed the jdk1.7 software on window xp
environment & copy the jdk bin address & paste it in system variable path.After that i did run the program & got output.Man now can u think more why i was getting run time error while I used the same procedure as before?

I have no idea how to get the error message you were getting.