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EQUIVALENT OF EVAL() FUNCTION IN JAVA


 
Pradyumna Hari
Greenhorn
Posts: 15

posted 20 years ago
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Hi all,
Can any one tell me what is the equivalent of
eval function ( this is a function in javascript ) in java. The requirement is
to evaluate the value of an expression but the expression is itself a string.
Example
ClassA a = new ClassA();
String strExpression = "a.getName()" ;

Now I want to print the value returned by a.getName(). Is there any function ftn
such that
System.out.println(ftn(strExpression)) would print the value returned by
a.getName()
Thanks

[ June 04, 2002: Message edited by: Pradyumna Hari ]



 
David O'Meara
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Posts: 13459

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posted 20 years ago
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You're looking for reflection.
You can get a Class from an instance with

?
1
Class myClass = object.getClass();


then you can have a look at the class and do things like find and call methods
etc.

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Class[] args = new Class[0];
//get the zero-arg method called 'getname'
java.lang.reflect.Method meth = myClass.getDeclaredMethod("getName", args);
//call the method on our instance with no arguments
myClass.invoke( object, new Object[0] );


or something like that...
I didn't actually test the code, but it should get you started.
Dave


 

With a little knowledge, a cast iron skillet is non-stick and lasts a lifetime.


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