you might want to have a look at java properties file.
is that what you need?
http://www.exampledepot.co
http://java.sun.com/j2se/1
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Java Program
Friends,
i have text file include text as java statement for example first line is : "var1 = 5 ;"
i need from java program code to read this line from the text file and let java program treat it as a statement not as string that give me chance to use var1 later inside the code and so on...
so how can i do it?
i tried some solutions depends on com.sun.util.... but i do not know how and where could i get this package to be work correctly in my pc?
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Answers
You cannot "run" text that you read from a file. For example, you cannot read a text file that contains a statement like "Thread t=new Thread();", and then expect your program to have an object called t of type Thread available for use!
However, you can have a similar effect by creating code structures that define, initialize and use objects dynamically based on what is read from a file.
_______________
Nayer Naguib
nayernaquib: I beg to differ. All you need is an interpreter.
for example, something like: http://tns-www.lcs.mit.edu
HonorGod: I'm afraid an interpreter will not help in this case.
What the author would like to do is the following:
Let the text file code.txt contain the following line of text:
int z=5;
and let the method that reads this text file contain the following code:
void readFile() {
int x=0, y=2;
readAndExecuteFile("code.t
//and runs the Java statements contained in the file
//then the user would like to put here for example x=y*z; and of course would like it to work!
//note that z was defined in the file not in the code!
}
This is not possible, because there is no Java API that will directly execute Java source code at runtime.
_______________
Nayer Naguib
readAndExecuteFile() does not really exist! It's only here to explain what you wanted to do.
As I told you, you can put switch or if statements inside your code to dynamically execute statements depending on the contents of the text file, but you will not be able to directly execute Java code this way.
_______________
Nayer Naguib
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by: makerpPosted on 2007-01-02 at 04:20:54ID: 18227125
what you should do is create an interface and then compile an implementation of it at run-time... for example
interface IGetVariable{
public int getValue();
}
then in your code program to that interface rather than a concrete type
so
// use the compiler services to compile the text file
IGetVariable var = new GetVariableImpl();
/* have this in yoru text file */
class GetVariableImpl{
public int getValue(){
return 1;
}
}
of course if you want to be able configure your code in this way rather than have hardcoded classes etc you should consider the spring framework (http://www.springframewor