Java Help! Unable To Run Java Programs.

Replies

• 

  younus786

  Hi dude,
  First you need to install the correct jdk version.
  This are the steps you need to follow
  1.Install the correct jdk version either 1.6 or 1.7
  2.Check whether the correct folder of java is created in the folder program files in C drive or whatever your preferable drive.
  3.set path in command prompt as ,type this command exactly same in the cmd
  c:>path=C:\Program Files\Java\jdk1.6.0_01\bin;.;
  4.once this command get executed now type another command in cmd as
  c:>javac
  5. if you have correctly installed the java then following java commands will appear in cmd
  Usage: javac
  where possible options include:
  -g Generate all debugging info
  -g:none Generate no debugging info
  -g:{lines,vars,source} Generate only some debugging info
  -nowarn Generate no warnings
  -verbose Output messages about what the compiler is doing
  -deprecation Output source locations where deprecated APIs are u
  sed
  -classpath Specify where to find user class files
  -cp Specify where to find user class files
  -sourcepath Specify where to find input source files
  -bootclasspath Override location of bootstrap class files
  -extdirs Override location of installed extensions
  -endorseddirs Override location of endorsed standards path
  -d Specify where to place generated class files
  -encoding Specify character encoding used by source files
  -source Provide source compatibility with specified release
  
  -target Generate class files for specific VM version
  -version Version information
  -help Print a synopsis of standard options
  -X Print a synopsis of nonstandard options
  -J Pass directly to the runtime system
  6.if these command s then you have correctly installed the java software
  7.Now move to your corresponding folder where you have save the java programs and execute it directly in cmd for example
  c:>javac Hello.java
  c:>java Hello
  8.Add the same environmental variable
  Enjoy.....
• 

  manishks

  C:\java programs>javac myfirstapp.java
  myfirstapp.java:2: cannot find symbol
  symbol : class string
  location: class myfirstapp
  public static void main(string[] args) {
  ^
  myfirstapp.java:3: package system does not exist
  system.out.print("i rule!");
  ^
  2 errors
  i am getting this error whenever i compile the program.
  i have installed java jdk correctly.
  also in my case jdk file is named as jdk1.6.0_02 hence i have set the path variables accordingly.
  please someone help me remove those errors.😔😔
• 

  manishks

  Path>.... C:\Program Files\Java\jdk1.6.0_02\bin;
  Classpath>... .;C:\Program Files\Java\jdk1.6.0_02\jre\bin;
  
  is anything wrong in above two???
• 

  Anoop Kumar

  Its like wining world cup to run first java program on your own😀
  I suppose you know how to set environment variables:
  add path variable in system variables. make sure it
  
  
  Open command prompt:
  type javac and hit enter. if it is not showing bad command then you are set.
  write java program. Got path of your program and compile by:
  javac .java.
  after copiling you will see class file in same directory will be created.
  run by:
  java without any extension.
  
  If nothing helps do not frustrate, This all setting path and classpath sometimes sucks.
  just download Eclipse :#-Link-Snipped-#
  Create new project and then click on src and create new class.
  #-Link-Snipped-#
• 

  Anoop Kumar

  musicfreakmandy

  Path>.... C:\Program Files\Java\jdk1.6.0_02\bin;
  Classpath>... .;C:\Program Files\Java\jdk1.6.0_02\jre\bin;
  
  is anything wrong in above two???

  yes,
  sometimes caps doesn't work. set by using path and classpath. or set only path.
  logoff machine and log in again. it should work.
• 

  manishks

  thanx ianoop 😀
  can i use netbeans instead of eclipse??????
• 

  Anoop Kumar

  sure you can .. only thing is Eclipse is lighter and simple to use.
  but even if you are making programs using eclipse. You should know and have some experience with running some java program using dos prompt and notepad.
• 

  manishks

  YES!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
  😁😁😁😁
  FOR THE FIRST TIME I HAVE SUCCESSFULLY COMPILED A JAVA PROGRAM!!!!!!!😎😎😎😁
  
  FINALLY!!!!
  
  THANX ianoop and younus786.👍👍
  thank you guys thank you for your help!!!!!!😀😀😀
  
  
  proud to be a cean!!!
• 

  manishks

  I would like to share what mistake i was doing!!!!
  
  
  in system.out.print 's' should be in capital similarly in strings also 's' should be in capital.
  for this silly mistake i wasnt getting the output and i changed path class path so many times..i reinstalled java jdk so many times!!!!!!!😛😛😁😁😁
  
  
  but i got the output at last!!!!!!😁😁
  
  
• 

  yanivx

  musicfreakmandy

  I would like to share what mistake i was doing!!!!
  
  
  in system.out.print 's' should be in capital similarly in strings also 's' should be in capital.
  for this silly mistake i wasnt getting the output and i changed path class path so many times..i reinstalled java jdk so many times!!!!!!!😛😛😁😁😁
  
  
  but i got the output at last!!!!!!😁😁
  
  

  
  Making a mistake is not Crime,Not learning from your mistakes is indeed crime i also faced a similar problem i set the path and then compiled and was really happy to see a .class file generated 😀
• 

  manishks

  yanivx

  Making a mistake is not Crime,Not learning from your mistakes is indeed crime i also faced a similar problem i set the path and then compiled and was really happy to see a .class file generated 😀

  Ya even i was very happy 😀
  Have you done any project using java language? ?
• 

  younus786

  Hi , guys if you want any help in doing java projects please repl me your queries.
  I m an scjp aspirant try to help your queries as much as possible
• 

  manishks

  Sure! We can discuss java concepts and projects here. It will surely help in clearing doubts! And also it will make java learning more fun! 😀
• 

  Sahithi Pallavi

  That's a very common mistake we used to do in the initial stage 😀
  
  This is the thread started by our old CEan - Shalini for Java freshers/ learners. Hope this thread helps you to start initially well-> #-Link-Snipped-#
• 

  manishks

  Thanks for the link sada. 😀 it will be really helpful. 😀
• 

  yanivx

  musicfreakmandy

  Ya even i was very happy 😀
  Have you done any project using java language? ?

  yes brother i am working in TCS and in Java domain and on a project of Telecom Inventory system using java.
• 

  manishks

  yanivx

  yes brother i am working in TCS and in Java domain and on a project of Telecom Inventory system using java.

  😁ok ok. I am in 4th sem and have just started learning java!😁😁
  
  Can you help me with this?
  I have downloaded a project on java named "placement office automation"
  The thing is it was a zipped file.When i extracted it i got a folder which contains so many classes and java editor. It contains classes means it is already compiled(this is what i have learned since i compiled my first program😀 ). So i wanted to know how should i analyse this project. i wanted to see how this whole thing works. But since it contains so many classes i dont know should i run each of the class individually or i should do something else!!😕
  any kind of help will be appreciated!!!😀😀
  
  
• 

  Sahithi Pallavi

  Can we screenshot of those files here?
• 

  Anoop Kumar

  manishks

  😁ok ok. I am in 4th sem and have just started learning java!😁😁
  
  Can you help me with this?
  I have downloaded a project on java named "placement office automation"
  The thing is it was a zipped file.When i extracted it i got a folder which contains so many classes and java editor. It contains classes means it is already compiled(this is what i have learned since i compiled my first program😀 ). So i wanted to know how should i analyse this project. i wanted to see how this whole thing works. But since it contains so many classes i dont know should i run each of the class individually or i should do something else!!😕
  any kind of help will be appreciated!!!😀😀
  
  

  look for main class source file and you can see that which class is being imported in program and in this way you can track how the data is flowing through the classes.
  You can simply download eclipse and import the whole project into eclipse. track the main file. and Eclipse automaticaly show you how other files is being used.
  give the link from where you downloaded the project.
• 

  manishks

  ianoop

  look for main class source file and you can see that which class is being imported in program and in this way you can track how the data is flowing through the classes.
  You can simply download eclipse and import the whole project into eclipse. track the main file. and Eclipse automaticaly show you how other files is being used.
  give the link from where you downloaded the project.

  thank you ianoop 😀 now i understand!! I just searched for java projects on google. I dont exactly remember the site 😛
• 

  Anoop Kumar

  manishks

  thank you ianoop 😀 now i understand!! I just searched for java projects on google. I dont exactly remember the site 😛

  Then upload your downloaded project to any site like mediafire.com and give the link.