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我的代码在顶层模块下面一行:如何通过反射正确实例化内部类?
String username = "[email protected]"
ModelBuilder userBuilder = utilityManager.getUtility("user").generateBuilder(username);
在我的“用户”实用工具类,我有以下几点:
private class UserBuilder extends ModelBuilder {
private final String username;
public UserBuilder(String username) {
this.username = username;
}
@Override
public User execute() {
return populateUserInformation(username);
}
}
@Override
public UserBuilder generateBuilder(Object... arguments) throws ReflectiveOperationException {
try {
return UserBuilder.class.getConstructor(String.class).newInstance((String) arguments[0]);
} catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException | InstantiationException e) {
throw new ReflectiveOperationException(e);
}
}
我试图使用generateBuilder(对象... arguments)方法返回我的UserBuilder类的新实例(作为模型构建器),但是,当我运行代码时,出现以下异常:
nested exception is java.lang.ReflectiveOperationException: java.lang.NoSuchMethodException:
com.login.util.UserOperationsUtility$UserBuilder.<init>(java.lang.String)] with root cause
java.lang.NoSuchMethodException: com.login.util.UserOperationsUtility$UserBuilder.<init>(java.lang.String)
at java.lang.Class.getConstructor0(Class.java:3082) ~[na:1.8.0_66]
at java.lang.Class.getConstructor(Class.java:1825) ~[na:1.8.0_66]
我试图遵循构造函数的java文档,但我不知道如何调试。我对Java的反射能力的了解很少。