We will later use the following datamodel for the example.

Create a Java project "de.vogella.spring.di.model" and create the following packages and classes.

			
package writer;

public interface IWriter {
	public void writer(String s);
}
		

			
package writer;

public class Writer implements IWriter {
	public void writer (String s){
		System.out.println(s);
	}
}

		

			
package writer;

public class NiceWriter implements IWriter {
	public void writer (String s){
		System.out.println("The string is " + s);
	}
}

		

			
package testbean;

import writer.IWriter;

public class MySpringBeanWithDependency {
	private IWriter writer;

	public void setWriter(IWriter writer) {
		this.writer = writer;
	}

	public void run() {
		String s = "This is my test";
		writer.writer(s);
	}
}

		

The class "MySpringBeanWithDependency.java" contains a setter for the actual writer. We will use the Spring Framework to inject the correct writer into this class.