java - 一种使用字符串创建新类的方法

Question

我有一个带有类名称的字符串，有没有一种方法(用 Java 编写)在创建该类的新实例时使用该字符串来执行如下操作:
object obj = new dataInString。
所以dataInString是从字符串中解析出来的。

Answer 1

你的意思是像Class.forName(String) ？引用方法的javadoc:

Returns the Class object associated with the class or interface with the given string name. Invoking this method is equivalent to:

Class.forName(className, true, currentLoader)

where currentLoader denotes the defining class loader of the current class.

For example, the following code fragment returns the runtime Class descriptor for the class named java.lang.Thread:

Class t = Class.forName("java.lang.Thread")

A call to forName("X") causes the class named X to be initialized.

然后，调用Class#newInstance()在返回的 Class 上(它必须有一个空的构造函数)。

Creates a new instance of the class represented by this Class object. The class is instantiated as if by a new expression with an empty argument list. The class is initialized if it has not already been initialized.