Java Class Dynamically with Constructor parameter

Question

I have to create a class dynamically but I want to use class constructor passing parameter.

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 the parameter ?

millimoose · Accepted Answer · 2014-06-24 06:05:43Z

16

You got close, getDeclaredConstructor() returns a Constructor object you're supposed to be using. Also, you need to pass a String object to the newInstance() method of that Constructor.

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

edited Jun 24, 2014 at 6:05

answered Oct 3, 2011 at 13:05

millimoose

40.1k11 gold badges90 silver badges138 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Saul · Accepted Answer · 2011-10-03 13:05:56Z

6

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);

answered Oct 3, 2011 at 13:05

Saul

18k8 gold badges67 silver badges93 bronze badges

Comments

Bala R · Accepted Answer · 2011-10-03 13:05:08Z

1

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

answered Oct 3, 2011 at 13:05

Bala R

109k23 gold badges203 silver badges212 bronze badges

Collectives™ on Stack Overflow

Java Class Dynamically with Constructor parameter

3 Answers 3

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related