CosminR

import javax.script.ScriptEngineManager;
import javax.script.ScriptEngine;
import javax.script.ScriptException;
public class Main {

    public static boolean evalBoolExpression(String script) {
        ScriptEngineManager manager = new ScriptEngineManager();
        ScriptEngine engine = manager.getEngineByName("js");
        Object result = null;
        try {
            result = engine.eval(script);
        } catch (ScriptException e) {e.printStackTrace();}
        return ((Boolean)result).booleanValue();
    }  

    public static void main(String[] args) {
        System.out.println(evalBoolExpression("\"coco\"==\"co\"+\"co\""));
        System.out.println(evalBoolExpression("142==100+50-(16/2)"));
        System.out.println(evalBoolExpression("var1=\"text\";var1==\"texte\""));
    }

}