Java Data Type - 如何使用字符串作为命令

import javax.script.Bindings;
import javax.script.ScriptContext;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;

public class Main {

  public static void main(String[] args) throws ScriptException {
    ScriptEngine jse = new ScriptEngineManager().getEngineByName("javascript");
    Bindings bindings = jse.getBindings(ScriptContext.ENGINE_SCOPE);
    Main test = new Main();
    bindings.put("test", test);
    String preFix = "demo";
    jse.eval("test." + preFix + "_test()");
    preFix = "actual";
    jse.eval("test." + preFix + "_test()");
  }

  public void demo_test() {
    System.out.println("demo test");
  }

  public void actual_test() {
    System.out.println("actual test");
  }
}