import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
 
class Ideone {
  public static void main(String args[]) {
  	  ScriptEngineManager manager = new ScriptEngineManager();
 
    ScriptEngine engine = manager.getEngineByName("js");
    try {
      String input = "Math.pow(x,2)+2*3";
      int x = 1;
      engine.put("x", x);
      Object result = engine.eval("y = "+input+";");
    System.out.println(String.format("%s dla x=%d = %s",input,x,result));
     } catch (ScriptException e) {
      System.err.println(e);
    }
  }
}

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