How to run Java public static void main from Terminal

Question

Hi guys, so my homework is asking that I run my program on command prompt which would be Terminal for Mac users like me.

How would I run this on Terminal? How to I access bin?

Also for the >java Echo "echo this string"

How can "echo this string" be accessed as arg[0] and arg1? Which is which for arg[0] and arg1???

And as you are also asking about eclipse: https://www.cs.colostate.edu/helpdocs/eclipseCommLineArgs.html — GhostCat, Feb 18 '19 at 14:18
can you up the answers if you think they were helpful to you. — mcvkr, Mar 01 '19 at 16:58

score 0 · Answer 1 · answered Feb 18 '19 at 02:18

0

If you already have your Echo.java file, compile it with javac Echo.java.

After that, you can run the generated Echo.class with java Echo "echo this string".

answered Feb 18 '19 at 02:18

Arjon Dela Cruz

a lovely person · Answer 2 · 2019-02-18T14:13:53.880

How can "echo this string" be accessed as arg[0] and arg1? Which is which for arg[0] and arg1???

you just System.out.print them in your code and that's it.

on how to start your app from the terminal use

java MyClass

if it's a class or

java -jar MyClass.jar

if it's a jar file

and you can add the Sting [] args in your command like this

java MyClass first_arg second_arg ect...

the array is seperated by white spaces and it's just accessed within your main with the args[] array .

here is what your Echo class might look like :

public class Echo
{
public static void main (String [] args )
{
for (String str : args )
{
System.out.print(str +" " );
}
}
}

score 0 · Accepted Answer · answered Feb 18 '19 at 03:39

//A Very Simple Example
class ExampleProgram {
  public static void main(String[] args){
    System.out.println("I'm a Simple Program");
  }
}

Compiling the Program

The Java compiler is invoked at the command line on Unix and DOS shell operating systems as follows:

  javac ExampleProgram.java

Interpreting and Running the Program

The Java interpreter is invoked at the command line on Unix and DOS shell operating systems as follows:

java ExampleProgram

At the command line, you should see:

I'm a Simple Program

3 Answers3