[英]How to use varargs as the parameter of Constructor.getConstructor( ) in java
I have a java class like below which I want to create an instance of this class dynamically by using class name. 我有一个像下面这样的Java类,我想通过使用类名动态创建该类的实例。
class Demo {
public Demo(String... s) {
//some initialization here.
}
}
And I want to create an object using following code 我想使用以下代码创建一个对象
Class<?> klass = Class.forName("Demo");
Constructor<?> con = klass.getConstructor("**what should be here**");
Object obj = con.newInstance(param1, param2, ...);
String...
is just String[]
so you can use String...
只是String[]
因此您可以使用
Constructor<?> con = klass.getConstructor(String[].class);
Note that you need to invoke the constructor like 请注意,您需要像
Object o = con.newInstance((Object) new String[] {"first", "second", "more"});
with the cast to (Object)
for a varargs invocation. 将其强制转换为(Object)
以进行varargs调用。
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