Java Reflection Learning (Java reflect) (ii)

Ok before said the reflection and reflection analysis of Java class, then these things have a horse effect, the following applications:

Iii. using reflection to analyze objects at run time

• Simply write aEmployeeClass, then use java reflex to take name domain Getdeclarefield (string  name) can get all , even private above said, so to the 9< Span style= "FONT-FAMILY:SIMSUN; font-size:11pt, "lang=" ZH-CN "> OK.

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But in the first11 Yes, it was wrong , because get (Field f) No access so illegalaccessexception, Here's a way Setaccessible (Boolean b), This cargo is for Debug, persistent storage, and similar mechanisms provide finish reading the following :

Access, of course, is easy to use Field.set (E, "hehe"); Such statements are assigned to a value ~

Iv. Reflection -- generic array

Array (java.lang.reflect) allows you to create arrays dynamically, following the implementation code:

　　

But this code is object[]object[]string[],string[] turn into object[]

　　

　　Error:classcastexception:

　　

So how is the conversion correct? , array There is a method called newinstance (class ) Span style= "FONT-FAMILY:CALIBRI;" lang= "en-US" ><?> componenttype, int length); This method you just given the array of the original type and the length of the array, then return come out objectstring[].

Maincode:

　　

Method: (Arrayprint (int[]) is the print function , Goodarraygrow (int[] a) is the growth array function )

　　

　　

　Result:

　

Succeeded in increasing the array hohoho~

　　

Java Reflection Learning (Java reflect) (ii)