import java.util.List;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineFactory;
import javax.script.ScriptEngineManager;
public class Main {
public static void main(String[] args)throws Exception
{
ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName("js");
String myJSCode = "function calcul()"
+ "{"
+ "return (150 * 3);"
+ ""
+ "}";
System.out.println(engine.eval(myJSCode));
}
}