publicclassRemoteUtil{privatestaticfinalConcurrentMap<Class, Object> REMOTE_CACHE =newConcurrentHashMap<>();publicstatic<T> Tget(Class<T> clazz){returnclazz.cast(REMOTE_CACHE.computeIfAbsent(clazz, RemoteUtil::getProxyInstance)); }privatestaticObjectgetProxyInstance(Class clazz){returnProxy.newProxyIn...
publicclassRemoteUtil{privatestaticfinalConcurrentMap<Class,Object>REMOTE_CACHE=newConcurrentHashMap<>();publicstatic<T>Tget(Class<T>clazz){returnclazz.cast(REMOTE_CACHE.computeIfAbsent(clazz,RemoteUtil::getProxyInstance));}privatestaticObjectgetProxyInstance(Classclazz){returnProxy.newProxyInstance(ClassL...
public static <T> T get(Class<T> clazz) { return clazz.cast(REMOTE_CACHE.computeIfAbsent(clazz, RemoteUtil::getProxyInstance)); } private static Object getProxyInstance(Class clazz) { return Proxy.newProxyInstance(ClassLoader.getSystemClassLoader(), new Class[]{clazz}, (proxy, method, args...
借助对TypeToken原理的分析,加强对泛型擦除的理解,使得我们能够知道什么时候,通过什么方式可以获取到泛型的类型。 泛型擦除 众所周知,Java的泛型只在编译时有效,到了运行时这个泛型类型就会被擦除掉,即List<String>和List<Integer>在运行时其实都是List<Object>类型。 为什么选择这种实现机制?不擦除不行么? 在Java...
return clazz.cast(REMOTE_CACHE.computeIfAbsent(clazz, RemoteUtil::getProxyInstance)); } private static Object getProxyInstance(Class clazz) { return Proxy.newProxyInstance(ClassLoader.getSystemClassLoader(), new Class[]{clazz}, (proxy, method, args) -> { ...
publicclassApiTask<T>{privatefinalTypemType;privatefinalGsonmGson;publicApiTask(){mType=newTypeToken<ResCommon<T>>(){}.getType();mGson=newGson();}} 以上形式的代码在调用mGson.fromJson(json,mType)方法时就会抛出如下异常: Causedby:java.lang.ClassCastException:com.google.gson.internal.LinkedTreeMap...
以下是针对你的问题“TypeToken<Response<T>>传入泛型,Gson如何解析不会报错java.lang.ClassCastException”的详细解答: 1. 理解TypeToken<Response<T>>的泛型结构 Response<T>是一个泛型类,其中T是一个类型参数。当我们想要使用Gson来反序列化一个Response<T>类型的对...
<Response<String>>getType(); // fromJson返回Map或者List, ClassCastException! Response<String> o = new Gson().fromJson(json, type); 总结 Gson解析时TypeToken<T>的泛型参数只能使用时传入确切的类型才能获取正确的Type, 这也是TypeToken设计成抽象类的巧妙之处和原因(改为只有protected构造方法的普通类...
看来TypeToken不能正常工作，因为我从GSON那里得到了一个类强制转换错误。java.lang.ClassCastException: ...
-- this is why a type parameter cannot be cast to a class because javac merely does not have any clue on that. If you want to have your code to be more type-safe, you might want to bound toTypeToken<T>, notType, but you'll need to cast its.getType()toClassif possible and nece...