How to parse complex logical operations in java?

Question

Is there any way to parse strings which include logical and/or operators and get result as true or false in java? For example

    (1 OR 0 AND 1 AND 0 OR(0 AND 0))

I couldn't find any library. Actually I have some ideas but they are so complex. Maybe some easier way?

https://stackoverflow.com/questions/2605032/is-there-an-eval-function-in-java. But you may have to modify your input expression. — GeekFactory, Feb 18 '20 at 08:07

score 4 · Accepted Answer · answered Feb 18 '20 at 08:11

You could use already mentioned script engine:

String expression = "(1 || 0 && 1 && 0 ||(0 && 0))";
Object result = new ScriptEngineManager().getEngineByName("JavaScript").eval(expression);
System.out.println(result);

or spring expression language:

String data = "(true OR false AND true AND false OR(false AND false))";
ExpressionParser parser = new SpelExpressionParser();
Expression exp = parser.parseExpression(data);
result = exp.getValue();
System.out.println(result);

Please note, that in both cases there was needed to modify original expression by replacing eighter lofical operators or logical constants.

This was exactly what i was looking for. Thank you! – Mrkrky Feb 18 '20 at 09:48 — Mrkrky, Feb 18 '20 at 09:48

How to parse complex logical operations in java?

1 Answers1