Java – what’s the difference between converting @ Autowired to a variable and a method?

• Java 
Class A {
Class A {

   private B instanceB;

   @Autowired
   public setInstanceB(B instanceB) {
     this.instanceB = instanceB;
   }

}

The upper one and this one

Class A {

   @Autowired
   private B instanceB;

   public setInstanceB(B instanceB) {
     this.instanceB = instanceB;
   }

}

Does the behavior vary depending on the access modifier?

Solution

The difference is that the setter will be called, if this is where you place it, it is useful, if it does other useful things, validation, etc Usually you are comparing:

public class A {
  private B instanceB;

  @Autowired
  public setInstanceB(B instanceB) {
    this.instanceB = instanceB;
  }
}

VS

public class A {
  @Autowired
  private B instanceB;
}

(i.e. there is no setter)

In this case, the first is the best, because the lack of installers makes mockery / unit testing more difficult Even if you have a setter, you can automatically connect data members. If the setter does different things, you can create a problem This will invalidate your unit test

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