how to convert a String to Object in JAVA

Question

I am retrieving a String variable from the Database and storing in a variable.

String name = "Peter"     ---- >(retrieved from the database)

I already have a class called Peter. I need to initialize the class using the retrieved variable name.

Assume that ,whatever String is retrieved from the database , I have a class defined for it in my package...

Is there a way to create a Object for the String I retrieve from the Database?

If your Peter string is coming in a json format the you can deserialize that and "convert" it into an Peter Object — ΦXocę 웃 Пepeúpa ツ, Feb 05 '16 at 06:28
Peter is just coming from a SQL table . it is just comes out as a String .( by doing a sql select call) — ktbffh, Feb 05 '16 at 06:30
Possible duplicate of [Convert String into a Class Object](http://stackoverflow.com/questions/5401467/convert-string-into-a-class-object) — Ali Sheikhpour, Feb 05 '16 at 06:33
I think you need this one: http://stackoverflow.com/questions/1268817/create-new-class-from-a-variable-in-java — BenBen, Feb 05 '16 at 06:33
Class Peter { } Class MainProg { String a = session.get(table,key); // a contains peter..... } I need to create Class for whatever data is stored in String a — ktbffh, Feb 05 '16 at 06:33

score 6 · Answer 1 · answered Feb 05 '16 at 06:31

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Class.forName(name).newInstance()

answered Feb 05 '16 at 06:31

Ken Clubok

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You can comment it also. – Pratik Butani Feb 05 '16 at 06:43

score 0 · Accepted Answer · edited May 23 '17 at 12:23

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Using Class.forName() - java.lang.reflect If we know the name of the class & if it has a public default constructor we can create an object in this way.

Class myClass = Class.forName("MyClass");

Class[] types = {Double.TYPE, this.getClass()};
Constructor constructor = myClass.getConstructor(types);

Object[] parameters = {new Double(0), this};
Object instanceOfMyClass = constructor.newInstance(parameters);

See Java how to instantiate a class from string

edited May 23 '17 at 12:23

Community

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answered Feb 05 '16 at 06:37

mehere

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What if we don't know the class name ? That's my scenario – ktbffh Feb 05 '16 at 13:29

how to convert a String to Object in JAVA

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