您需要获取ScriptEngine实例而不是ScriptEngineFactory
final ScriptEngine engine = engineFactory.getScriptEngine();
if (engine instanceof Compilable) {
...
为何全部Compilable？因为这些脚本引擎将来可能会被编译。但目前尚不支持，因此它们都实现了此接口。您可以尝试编译空字符串：
if (engine instanceof Compilable) {
try {
((Compilable) engine).compile("");
} catch (Error e) {
System.out.println(engineName + " Script compilation is not supported.");
} catch (ScriptException e) {
e.printStackTrace();
}
System.out.println(engineName + " Script compilation is supported.");
} else {
System.out.println(engineName + " Script compilation is not supported.");
}
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