Use Java scripting engine (JDK 1.6)

    

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 mgr = new ScriptEngineManager();
    List<ScriptEngineFactory> engines = mgr.getEngineFactories();
    for (ScriptEngineFactory engine : engines) {
      System.out.println(engine.getEngineName());
      for (String n : engine.getNames()) {
        System.out.println("Short name : " + n);
      }
    }
    ScriptEngine engine = mgr.getEngineByName("JavaScript");
    String myJSCode = "function myFunction(){return (4+2);}myFunction();";
    System.out.println(engine.eval(myJSCode));
  }
}

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Use Java scripting engine (JDK 1.6) : Script Engines « JDK 6 « Java

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