Creating a batch file for simple javac and java command execution

Question

It is a really simple thing but I cannot get my head around it  I have looked at plenty of StackOverFlow post and as well as on internet   My goal is to create a  bat which will open cmd and execute my Main java into command prompt   Easy isn t it  but I have got confused about how    Below I am writing steps which my batch file should perform   open cmd javac Main java java Main   My file will reside next to all my  java so I am assuming I don t need to give explicit path   My understanding so far by research    open text editor write a code to open cmd Which I am not sure how  echo javac Main java  Which is still fuzzy concept for me  echo java Main   Save as  name bat  Any help will be appreciated   Thank you

User · Answer

Am i understanding your question only  You need  bat file to compile and execute java class files   if its a  bat file   you can just double click    and in your  bat file  you just need to javac Main java   make sure your bat has the path to ur Main java  java Main  If you want to echo compilation warnings statements  that would need something else  But since  you want that to be automated  maybe you eventually don t need that

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Create a plain text file  using notepad  and type the exact line you would use to run your Java file with the command prompt  Then change the extension to  bat and you re done   Double clicking on this file would run your java program   I reccommend one file for javac  one for java so you can troubleshoot if anything is wrong    Make sure java is in your path  too   IE typing java in a Dos windows when in your java workspace should bring up the java version message   If java is not in your path the batch file won t work unless you use absolut path to the java binary

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I ve also faced a similar situation where I needed a script which can take care of javac and then java ing  my java program  So  I came up with this BATCH script        author Rudhin Menon     Created on 09 06 2015        Auto-Concrete is a build tool  which monitor the file under     scrutiny for any changes  and compiles or runs the same once     it got changed                                                        md5sum and gawk programs are prerequisites for this script      Please download them before running auto-concrete                                                        Happy coding       echo off     if filename is missing if   1  EQU    goto usage message     Set cmd window name title Auto-Concrete v0 2  cd versions  if  errorlevel  NEQ 0       echo creating versions directory     mkdir versions     cd versions    cd     javac   1    loop        Get OLD HASH of file     md5sum   1    gawk   print  1    gt  old     set  p oldHash  lt old     copy   1   versions  oldHash  java        inner loop        Get NEW HASH of the same file     md5sum   1    gawk   print  1    gt  new     set  p newHash  lt new         While OLD HASH and NEW HASH are the same        keep comparing OLD HASH and NEW HASH     if   newHash   EQU   oldHash                Take rest before proceeding         ping -w 200 0 0 0 0  gt nul         goto inner loop               Once they differ  compile the source file        and repeat everything again     echo      echo            1 changed on  DATE  at  TIME                  echo             javac   1  goto loop   usage message echo Usage   auto-concrete FILENAME java   Above batch script will check the file for any changes and compile if any changes are done  you can tweak it for compiling whenever you want  Happy coding

User · Answer

I do not have a JDK installed on my machine to verify this  but here s something to get you started with   CLASSPATH  C  Program Files Java jdk1 6 bin rem or whatever your path is START  CLASSPATH  javac Main java START  CLASSPATH  java Main

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author MADMILK  echo off  getback1 set  p jump1 Do you want to compile  Write yes no    if  jump1    yes goto loop if  jump1    no goto getback2    Important part here  getback2 set  p jump2 Do you want to run a java program  Write yes no    if  jump2    yes goto loop2 if  jump2    no goto getback1    Make a folder anywhere what you want to use for scripts  for example i make one  cd desktop    This is the folder where is gonna be your script s  mkdir My Scripts cd My Scripts title Java runner compiler echo REMEMBER  LOWER CASES AND UPPER CASES ARE IMPORTANT   loop echo This is the java compiler program  set  p jcVal What java program do you want to compile     javac  jcVal   loop2 echo This is the java code runner program  set  p javaVal What java program do you want to run     java  javaVal  pause  gt nul echo Press NOTHING to leave

User · Answer

Open Notepad  Type in the following   javac   java Main  SaveAs Main bat or whatever name you wish to use for the batch file   Make sure that Main java is in the same folder along with your batch file  Double Click on the batch file to run the Main java file

User · Answer

hey I think that you just copy your compiled class files and copy the jre folder and make the following as the content of the batch file and save all together any windows machine and just double click   echo setpath d  jre d  cd myprogfolder java myprogram

User · Answer

you want these four lines of code in your Run bat    echo off            this makes it so you have an empty cmd window on startup javac Main java      this compiles the  java into a  class java Main             this runs the  class file pause                this prevents the window from instantly closing after program end

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The only other thing I would add is to make it a tad more flexible  Most times I ll have a trivial java file I want to run like - Main java  Simple java  Example java  or Playground java  you get the idea    I use the following to strike off a javac and corresponding java    echo off javac   n1 java java   n1   The   n1 gets the filename  sans extension  of the first argument passed to the batch file  So this way I can run it using tab completion and not have to worry about it working with either the  class or  java extension   So both of the following will have the same result   run bat Main class and run bat Main java   Doesn t 100  answer the original posters question  but I think it is a good next step evolution for simple javac java programs

User · Answer

open notepad  write   echo off  javac Main java  java Main    3 saveAs blahblah bat  make sure that Main java resides with your batch file and java path is set in env  variable   4   double click on batch file  no need to open cmd explicitly tt will open itself on  bat execution

User · Answer

I just made a simple batch script that takes a file name as an argument compiles and runs the java file with one command  Here is the code    echo off set arg1  1 shift javac -cp    arg1  java java  arg1  pause   I just saved that as run-java bat and put it in the System32 directory so I can use the script from wherever I wish   To use the command I would do   run-java filename   and it will compile and run the file  Just make sure to leave out the  java extension when you type the filename  you could make it work even when you type the file name but I am new to batch and don t know how to do that yet

[java] Creating a batch file, for simple javac and java command execution

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