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

public class Look { 
public static void main(String[] args) throws ScriptException { 
ScriptEngine engine = new ScriptEngineManager().getEngineByName("js"); 
engine.eval("Object.prototype.merge = function(obj2){ return this; }"); 
engine.eval("function nothingTodo(k, v) {return v}"); 
engine.eval("JSON.parse('{\"name\" : \"jack\"}')"); 
engine.eval("JSON.parse('{\"name\" : \"jack\"}', nothingTodo)"); 
} 
}