How to parse Java code stored in a string

Question

How can I parse Java code stored in a String?

Example:

String s = "int i = 2; System.out.println(\"the number is: \" + i);";

What exactly are you trying to achieve?

Luchian Grigore
– Luchian Grigore

2011-10-13 14:36:06 +00:00
Commented Oct 13, 2011 at 14:36 — Luchian Grigore
– Luchian Grigore, Commented Oct 13, 2011 at 14:36
Do You want to execute the code in the String ?

Damian Leszczyński - Vash
– Damian Leszczyński - Vash

2011-10-13 14:36:59 +00:00
Commented Oct 13, 2011 at 14:36 — Damian Leszczyński - Vash
– Damian Leszczyński - Vash, Commented Oct 13, 2011 at 14:36

Jon Skeet · Accepted Answer · 2011-10-13 14:37:33Z

3

You would probably try to use the JavaCompiler interface...

Search for JavaCompiler and ToolProvider (which is what you typically use to get hold of an instance of the interface) for tutorials etc.

answered Oct 13, 2011 at 14:37

Jon Skeet

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Damian Leszczyński - Vash · Accepted Answer · 2011-10-13 14:41:35Z

2

An alternative could be the Beanshell

answered Oct 13, 2011 at 14:41

Damian Leszczyński - Vash

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COD3BOY · Accepted Answer · 2011-10-13 14:51:35Z

1

Use Groovy!

String s = "int i = 2; System.out.println(\"the number is: \" + i);";
Binding binding = new Binding();
GroovyShell shell = new GroovyShell(binding);
Object value = shell.evaluate(s);

edited Oct 13, 2011 at 14:51

answered Oct 13, 2011 at 14:38

COD3BOY

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