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Bindings And Scopes

import javax.script.Bindings; import javax.script.ScriptContext; import javax.script.ScriptEngine; import javax.script.ScriptEngineManager; import javax.script.ScriptException; public class GetToKnowBindingsAndScopes {   public static void main(String[] args) {     ScriptEngineManager manager = new ScriptEngineManager();     manager.put("global", "global bindings");     dumpBindings(manager.getBindings());     ScriptEngine engine = manager.getEngineByExtension("js");     engine.put("engine", "engine bindings");     dumpBindings(engine.getBindings(ScriptContext.GLOBAL_SCOPE));     dumpBindings(engine.getBindings(ScriptContext.ENGINE_SCOPE));     try {       Bindings bindings = engine.createBindings();       bindings.put("engine", "overridden engine bindings");       bindings.put("app", new GetToKnowBindingsAndScopes());       bindings.put("bindings", bindings);       engine.eval("app.dumpBindings (bindings);", bindings);     } catch (ScriptException se) {       System.err.println(se.getMessage());     }     ScriptEngine engine2 = manager.getEngineByExtension("js");     engine2.put("engine2", "engine2 bindings");     dumpBindings(engine2.getBindings(ScriptContext.GLOBAL_SCOPE));     dumpBindings(engine2.getBindings(ScriptContext.ENGINE_SCOPE));     dumpBindings(engine.getBindings(ScriptContext.ENGINE_SCOPE));   }   public static void dumpBindings(Bindings bindings) {     if (bindings == null)       System.out.println("  No bindings");     else       for (String key : bindings.keySet())         System.out.println("  " + key + ": " + bindings.get(key));     System.out.println();   } }