Want to run JavaScript code snippet which returns Boolean with the help of java

Question

I want to run a JavaScript code snippet which returns boolean, from java.

Currently I am using ProcessBuilder to run the JavaScript program with the command jjs filename.

I am able to perform the operations and getting the output from getOutputStream properly.

But my requirement is to return boolean from the script, when I make the similar changes in the script it gives compile time error invalid return statement, which is obvious.

when I use

var a=5; var b=6; print(a+b);

I am getting a output 11. But I want to execute a script like

var a=5; 
if(a>0) 
    return true; 
else 
    return false;

I get errorStream like Invalid return statement Expected eof but found } } ^

Answer 1

The getInputStream method of the ProcessBuilder class gives you a stream from which you can read bytes. You have to convert the bytes to String and then parse to boolean.