CODEWITHSUNDEEP
javastringobject
user1541106
user1541106

Reputation: 251

Java - Help to transform a String into a class object

This is the final result Im aiming to get:

ItemStack block = new ItemStack(Block.dirt, 1);

And this is what I have

    String s = "Block.dirt";    
    ItemStack block = new ItemStack(    , 1);

It kinda looks impossible, but is there a way to turn the string "Block.dirt" into Block.dirt?

I tried many things, some people suggested me to use GroovyShell and Binding but I cannot do that.

Is there a way to name a object from a string?

Any help is highly appreciated. Thank you.

Can I have an example?

Upvotes: 1

Views: 105

Answers (3)

tskuzzy
tskuzzy

Reputation: 36476

Yes, you will want to use the reflection API.

Upvotes: 0

paulsm4
paulsm4

Reputation: 121881

Sure - people do it all the time. For example, when they open a JDBC connection object.

You want "class.forName()":

http://www.theserverside.com/news/1365412/Understanding-ClassforName-Java

Within Java, dynamic-loading is typically achieved by calling the forName method on the class java.lang.Class

Here's an article on "Reflection" in general:

http://java.sun.com/developer/technicalArticles/ALT/Reflection/

Upvotes: 1

Dave Newton
Dave Newton

Reputation: 160321

Why can't you do that? Or use an evaluation engine like MVEL etc?

In any case, you can split up the string, instantiate based on class name, and use reflection to call the method. Or, in this case, call a static method, based on the snippet you provide.

Without knowing what you've actually tried that didn't work, not sure how else to help.

Upvotes: 1

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