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Google Guice – Injectable Constructors

Google Guice - Inbuilt Bindings

This topic is about Google Guice – Inbuilt Bindings.

Guice provides inbuilt binding for java.util.logging.Logger class. Logger’s name is automatically set to the name of the class into which the Logger is injected. See the example below.

Example

Create a java class named GuiceTester.

GuiceTester.java

import java.util.logging.Logger;

import com.google.inject.AbstractModule;
import com.google.inject.Guice;
import com.google.inject.Inject;
import com.google.inject.Injector;

public class GuiceTester {
   public static void main(String[] args) {
      Injector injector = Guice.createInjector(new TextEditorModule());
      TextEditor editor = injector.getInstance(TextEditor.class);
      editor.makeSpellCheck();
   } 
}

class TextEditor {
   private Logger logger;

   @Inject
   public TextEditor( Logger logger) {
      this.logger = logger;
   }

   public void makeSpellCheck(){
      logger.info("In TextEditor.makeSpellCheck() method");
   } 
}

//Binding Module
class TextEditorModule extends AbstractModule {

   @Override
   protected void configure() {
   } 
}

Output

Compile and run the file, you will see the following output.

Dec 20, 2017 12:51:05 PM TextEditor makeSpellCheck
INFO: In TextEditor.makeSpellCheck() method

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