Java class dynamically with the Constructor parameter

Question

I need to create a class dynamically, but I want to use the transfer parameter of the class constructor.

Currently my code looks like

Class<HsaInterface> _tempClass = (Class<HsaInterface>) Class.forName(hsaClass); _tempClass.getDeclaredConstructor(String.class); HsaInterface hsaAdapter = _tempClass.newInstance(); hsaAdapter.executeRequestTxn(txnData); 

How can I call the constructor with a parameter?

Answer 1

You got close, getDeclaredConstructor() returns the Constructor object that is supposed to be used. In addition, you need to pass the String object to the newInstance() method of this Constructor .

 Class<HsaInterface> _tempClass = (Class<HsaInterface>) Class.forName(hsaClass); Constructor<HsaInterface> ctor = _tempClass.getDeclaredConstructor(String.class); HsaInterface hsaAdapter = ctor.newInstance(aString); hsaAdapter.executeRequestTxn(txnData); 

Answer 2

 Class<HsaInterface> _tempClass = (Class<HsaInterface>) Class.forName(hsaClass); // Gets the constructor instance and turns on the accessible flag Constructor ctor = _tempClass.getDeclaredConstructor(String.class); ctor.setAccessible(true); // Appends constructor parameters HsaInterface hsaAdapter = ctor.newInstance("parameter"); hsaAdapter.executeRequestTxn(txnData); 

Answer 3

 Constructor constructor = _tempClass.getDeclaredConstructor(String.class); Object obj = constructor.newInstance("some string");