CODEWITHSUNDEEP
java
Tazmanian Tad
Tazmanian Tad

Reputation: 313

How to run a package from another package inside the same project?

I have two packages inside my project, a and b.

a is my "main class" that runs when the program runs but I need to make b run from a (if that makes sense).

I'm sure its something along the lines of PackageB.BMain but I'm not sure.

Edit:

Okay so I've learned a few new things, to start my main project is RevIRC, inside that I have two packages, MainChat and RevIRC, now when I run the program RevIRC is ran, I need to make Mainchat run when RevIRC is ran.

Like I said before I'm sure its something along the lines of RevIRC.MainChat.ChatMain() but I can't seem to figure it out.

Upvotes: 0

Views: 4395

Answers (3)

kamlesh patel
kamlesh patel

Reputation: 385

if i am not wrong you want to run main method of class B from class A. That you can call using B.main(arg[]); eg : 

package a;
public class A
{ 
public static void main(String[] args)
{
    System.out.println("This is main method of class A");
    B.main(null);
            /*pass any args if you want or simply set null arg*/
}
}
package b;
public class B
{
public static void main(String[] args)
{
    System.out.println("This is main method of class B");
}
}

i hope this simple example will clear your doubt.

you can refer to link which contains Java tutorial for beginners.

Upvotes: 0

Lews Therin
Lews Therin

Reputation: 10995

If you have two main methods it will either run from A or B. The JVM will choose the first main method it sees IIRC.

Have a standalone class that will have main. And create your classes there.. ?

import a.Class1;
import b.Class2;
public class MainController
{

  public static void main(String args[])
  {
     Class1 class1 = new Class1() ;
     Class2 class2 = new Class2() ;
    //Both class no start at the "same" time.
  }
}

Upvotes: 0

npinti
npinti

Reputation: 52185

You have 2 options:

  • Either create a new instance of B from A, like so: PackageB.BMain b = new PackageB.BMain();
  • Access the methods in BMain in a static way like so: PackageB.BMain.someMethod();`

Note that you can use either of these exclusively or mix them up together, however, it all depends on how you have written your BMain class.

So for instance:

package PackageB

public class BMain
{
    public BMain()
    { }

    public void foo()
    {
        System.out.println("This is not a static method. It requires a new instance of BMain to be created for it to be called");
    }

    public static void bar()
    {
        System.out.println("This is a static method. It can be accessed directly without the need of creating an instance of BMain");
    }
}

Then in your main class (the class which has the main method):

package PackageA

public class AMain
{

    public static void main(String[] args)
    {
        PackageB.BMain.bar();

        PackageB.BMain bInstance = new PackageB.BMain();
        bInstance.foo();
    }
}

Upvotes: 1

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