[1.13.2] How can I replace vanilla method?

[First_jenkins]

Hello.

I want to replace vanilla method. Also, I found Access Transformers ,but don't know how to do. I'm a noob. 

Here's what I want to do.

 

Proposal: Replace charTyped method in GuiTextField.class (located in net.minecraft.client.gui) into another custom charTyped method that I created.

 

 [removed copyrighted code]

This is the full code of GuiTextField.class

And that method is 

 

 [removed copyrighted code]

 

What I tried is just replace whole class (Block displayguiscreen event and poped custom one)

Anyone..know how to replace or overwrite it? 

 

I have custom chartyped method(not above).

 

Edited February 25, 2019 by diesieben07
[removed copyrighted code

[First_jenkins]

12 minutes ago, diesieben07 said:

Why are you posting copyrighted code here that we can all see ourselves? There is no point in doing so.

 

What are you trying to achieve (not how do you want to achieve it, which is what you posted above)?

 

I'm trying to develop foreign language typing system. 

So, I want to intercept typewriting event to insert this additional typing function.