Check my answer. Michael Thanks for the answer. I have not tried ProcessBuilder, but does it allow me to run multiple commands in one session or do I need to close session after every command. James James 8, 1 1 gold badge 24 24 silver badges 27 27 bronze badges. Vivien Barousse Vivien Barousse 20k 2 2 gold badges 57 57 silver badges 64 64 bronze badges.
Emmanuel Osimosu Emmanuel Osimosu 4, 2 2 gold badges 32 32 silver badges 37 37 bronze badges. Is there something wrong with using the exec method? Community Bot 1 1 1 silver badge. Scott Bonner Scott Bonner 2, 5 5 gold badges 25 25 silver badges 27 27 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook.
Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Stack Gives Back Safety in numbers: crowdsourcing data on nefarious IP addresses. Featured on Meta. View the contents of the project directory. You should notice that there are two. Why the second one? The java compiler needs to know about any class that you use in a file that it is compiling.
If that class isn't part of the Java API the classes that are supplied automatically with Java , then it must be available somewhere locally. The java compiler noticed that there was a reference to the PatternMaker class in the Patterns.
So it compiled that file, too, and generated the PatternMaker. The java compiler will compile as many. Java programs are executed by calling on the Java Virtual Machine to execute them.
This is done by using the java command. The command requires that you give it the name of a class notice that there is no. The stuff following the class name are parameters that are in this case read by the program to do whatever it's doing.
In this case, the 18 is a number between 1 ane that will result in a different pattern being generated for each value and 21 is the number of lines that you want to see generated. You should play with other choices to see the results of other patterns instead of 18 try , for example.
The class named in the java command must have a static main method which you can verify by viewing the source file: Patterns.
Here, we're just concerned with compiling and executing Java programs, not with some of these issues you will learn or have learned in your computer science classes. When the Java compiler compiles your. We saw above that even if the necessary. The compiler can only find files if it knows where to look. The use of uppercase letters is important since Unix distinguishes lower case from uppercase.
What you should see is a list of directories separated by the : character. I have to code a C program that generates a random number. Then I have to call the compiled C program with a Perl program to run the C program 20 times and put all the generated random s into a text file, then print that text Hi All, I need to call a java method from a shell script.
I know we can use the command java ClassName to call the main method in it. But I need to call another method that is there in the class and pass an email to it. Can I use java ClassName. MethodName email Any help will be Hi, I need to execute a java program in a shell script. I then need to assign the value being returned by the program into a unix variable. Is there any way i can access the value in a variable in java program?
As in if my java code has a variable,. Connection problem with gui java program to postgreaql database using unix. Having problem in connecting my gui java program to postgreaql database. Then java proj1. Looking at the names of the libraries you mentioned, it seems like you want to run the commands on a remote server using ssh. The ProcessBuilder class in the Java standard library supports creating processes and reading their output. You should be able to build it to do what you need, and being in the standard library, it has pretty good documentation.
Is ProcessBuilder insufficient for your needs? You can certainly grab the output stream and get the exit value of the last command, which would be sufficient to do 3 by some regex. Not sure on 1. But doing what you want on a raw ProcessBuilder seems like it would be a pretty lightweight solution.
Have you considered Java's built-in Process class? You can retrieve the exit value of the command and get the output s of the shell. As for libraries, check ProcessBuilder. Also, check this: How to run Unix shell script from java code?
Depending on what you are doing ANT is a good way to go. If you create an ant script you can then execute that script from within java. Ant would also be better supported on other environments. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams?
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