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Class clazz = Class.forName("com.tur.command.ControllerCommand");
Constructor constructor = clazz.getConstructor(/*可以有参数类型*/),
Object obj = constructor.newInstance();当然还有泛型的使用。public Constructor<T> getConstructor(Class<?>... parameterTypes)
throws NoSuchMethodException,
SecurityException
Returns a Constructor object that reflects the specified public constructor of the class represented by this Class object. The parameterTypes parameter is an array of Class objects that identify the constructor's formal parameter types, in declared order. If this Class object represents an inner class declared in a non-static context, the formal parameter types include the explicit enclosing instance as the first parameter. public T newInstance(Object... initargs)
throws InstantiationException,
IllegalAccessException,
IllegalArgumentException,
InvocationTargetException
Uses the constructor represented by this Constructor object to create and initialize a new instance of the constructor's declaring class, with the specified initialization parameters. Individual parameters are automatically unwrapped to match primitive formal parameters, and both primitive and reference parameters are subject to method invocation conversions as necessary.
If the number of formal parameters required by the underlying constructor is 0, the supplied initargs array may be of length 0 or null. If the constructor's declaring class is an inner class in a non-static context, the first argument to the constructor needs to be the enclosing instance; see section 15.9.3 of The Java™ Language Specification. If the required access and argument checks succeed and the instantiation will proceed, the constructor's declaring class is initialized if it has not already been initialized. If the constructor completes normally, returns the newly created and initialized instance.
new 只适合在源码中使用,当我们在运行的时候动态创建对象时只能是反射了。
new 只适合在源码中使用,当我们在运行的时候动态创建对象时只能是反射了。话说:non-singleton行为的bean,Spring容器仅仅是new的替代,容器只负责创建。
这怎么理解