Pass parameter to JavaScript through Java code -


i'm trying define generic formula, e.g. "a+b" , use pass parameters. ideas how make thing work?

    scriptenginemanager manager = new scriptenginemanager();     scriptengine engine = manager.getenginebyname("javascript");     string formula="a+b";      engine.put("formula", formula);     engine.put("a", "3");     engine.put("b", "4");     res = engine.eval("r = formula").tostring();     system.out.println(res);

the output of above code "a+b" , not 7 expected.

to bind variable names values, use bindings.

i thing following code solves question:

scriptenginemanager manager = new scriptenginemanager(); scriptengine engine = manager.getenginebyname("javascript"); string formula="a+b";  bindings bindings = engine.createbindings(); bindings.put("a", 3); bindings.put("b", 4);  engine.setbindings(bindings, scriptcontext.engine_scope);  object res = engine.eval(formula); system.out.println(res.tostring());

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