Java Script evaluateExpression(String expr)

Description

evaluate Expression

License

Open Source License

Declaration

public static Double evaluateExpression(String expr) 

Method Source Code

//package com.java2s;
/**/* w w  w .ja  v a  2  s  .co m*/
 * This file is part of VisiCut.
 * Copyright (C) 2011 - 2013 Thomas Oster <thomas.oster@rwth-aachen.de>
 * RWTH Aachen University - 52062 Aachen, Germany
 *
 *     VisiCut is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU Lesser General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 *
 *     VisiCut is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU Lesser General Public License for more details.
 *
 *     You should have received a copy of the GNU Lesser General Public License
 *     along with VisiCut.  If not, see <http://www.gnu.org/licenses/>.
 **/

import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;

public class Main {
    public static Double evaluateExpression(String expr) {
        expr = expr.replace(",", ".");
        try {
            ScriptEngineManager mgr = new ScriptEngineManager();
            ScriptEngine engine = mgr.getEngineByName("JavaScript");
            expr = engine.eval(expr).toString();
        } catch (Exception e) {
            //e.printStackTrace();
        }
        return Double.parseDouble(expr);
    }
}

Related

1. decodeB64_TO_UTF8(String encodedStr)
2. escapeJavascript(String str)
3. eval(String expression, Object... arguments)
4. eval(String name, Map params)
5. eval(String script)
6. evaluateExpression(String s)
7. executeAppleScript(String script)
8. executeScript(String script)
9. executeScript(String strScript)