Java 27-8 reflection to set a property of an object to a specified value by reflection

The title means:

Write a class by reflection, there is a method in the class. The method can set a property (construct method, member variable, member method) of a class to a specific value

Code:

　　

1    The    parameter list of the method is the class name of a class, the member variable, and the assigned value of the variable. 2     Public   void  setProperty (Object obj, String PropertyName, Object value) 3             throwsnosuchfieldexception, SecurityException,4 IllegalArgumentException, illegalaccessexception {5 6          //  Gets the byte file object of the obj class 7Class C =Obj.getclass ();8 9          //  Gets the member variable of the class TenField f =C.getdeclaredfield (PropertyName); One  A          //  Cancel language access check  -F.setaccessible (true); -  the          //  Assign a value to a variable  - f.set (obj, value); -  -}

Test class:

　　

1  Public Static voidMain (string[] args)throwsNosuchfieldexception,2 SecurityException, IllegalArgumentException, illegalaccessexception {3 4         //to create an object of the person class5Person p =NewPerson ();6         //Private member variables cannot be accessed directly7         //This is done directly by using the tool class that you just wrote.8Tool T =NewTool ();9         //change the private member variable directly by means of the tool nameTenT.setproperty (P, "name", "Zhang San"); One         //change undefined type member variable AT.setproperty (P, "age", 13); -         //change public member variables -T.setproperty (P, "sex", ' male '); the System.out.println (p); -  -         //In fact, in addition to the private member variable, the other can be assigned by the previous method -     } +  - } +  A classPerson { at      //  The class has private member variables, undefined type member variables, public member variables  -     PrivateString name; -     intAge ; -      Public Charsex; -  - @Override in      PublicString toString () { -         returnName + "--" + Sex + "--" +Age ; to     } +  -}

Java 27-8 reflection to set a property of an object to a specified value by reflection