Run Javascript function with ScriptEngine

    

import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;

public class Main {
  public static void main(String[] argv) throws Exception {
    ScriptEngineManager mgr = new ScriptEngineManager();
    
    ScriptEngine engine = mgr.getEngineByName("JavaScript");
    String myJSCode = "function myFunction(){return (40 + 2);}myFunction();";
    System.out.println(engine.eval(myJSCode));

  }
}

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Run Javascript function with ScriptEngine : Script Engines « JDK 6 « Java

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