java test a condition stored into string variable

package com.nhc.personal;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
public class TestCondition {
   public static void main(String[] bag) throws Exception {
                  ScriptEngineManager factory = new ScriptEngineManager();
                  ScriptEngine engine = factory.getEngineByName(“JavaScript”);
                  String condition = “10==10 && 20==20?;
                  System.out.println(engine.eval(condition));
     }