How to give a string to other javaprogram?

[Outy]

Hi,

I have to make an application that starts another java-program. When the supervising program recieves a string for example "testthisisatest", the first 4 characters indicate the program that should be started, in this case test.java. The other characters "thisisatest" have to be send to the called program and should be shown on the screen.

How do I call another java-program and how do I pass the string to the other program?

Thx

Outliner

 

[LeonTang]

Hi,

You can use the method substring() found in the String class. It would be something like

String temp = "thisisatest";
String className = temp.substring(0,3);
String passInParam = temp.substring(4,temp.length()-1);
//className would have its value as "this";
//passInParam would have its value as "isatest"

For the passing in of parameters, I am not very sure on how you can do it so maybe someone else can suggest that to you

Gd Luck,
Leon If you need additional help, you can email to me at zaoliang@hotmail.com I don't guaranty that I will be able to solve your problems but I will try my best

 

[globos]

Hi.

What you need now, if I understand, is to invoke the main method of the compiled Java program. I think you meant test.class rather than test.java.

The idea is to use reflection, test this code, it launches the main method of the class specified in className (do not forget to set the correct class path) and with arguments cmdArray:

{
String[] cmdArray = new String[3];
String className = "test.launch.Test";//For example

cmdArray[0] = "arg1";
cmdArray[1] = "arg2";
cmdArray[2] = "arg3";

try
{
Class[] mainMethodArgsClasses = {cmdArray.getClass ()};
Object[] mainArgs = {cmdArray};
Class claz = Class.forName (className);
claz.getMethod ("main", mainMethodArgsClasses).invoke(null, mainArgs);
}
catch (Exception e)
{ e.printStackTrace (); }
}

I hope this will help you. --
Globos

 

[Outy]

Hello,

Thank you LeonTang and Globos for the quick replies!

Greetz
Outliner