Java基礎知識

@Override

表示重寫

編譯器能夠驗證@Override下面的方法名是不是父類中全部的

@Autowired

使用@Autowired 註解來實現依賴注入

能夠用在屬性、setter方法和構造器上

用在屬性上

@Component("fooFormatter")
public class FooFormatter {
 
    public String format() {
        return "foo";
    }
}

@Component
public class FooService {
     
    @Autowired
    private FooFormatter fooFormatter;
 
}

The annotation can be used directly on properties, therefore eliminating the need for getters and setters:

In the above example, Spring looks for and injects fooFormatter when FooService is created.

用在setter上

public class FooService {

    private FooFormatter fooFormatter;

    @Autowired
    public void setFooFormatter(FooFormatter fooFormatter) {
            this.fooFormatter = fooFormatter;
    }
}

The @Autowired annotation can be used on setter methods. In the above example, when the annotation is used on the setter method, the setter method is called with the instance of FooFormatter when FooServiceis created:

用在構造器上

public class FooService {
 
    private FooFormatter fooFormatter;
 
    @Autowired
    public FooService(FooFormatter fooFormatter) {
        this.fooFormatter = fooFormatter;
    }
}

The @Autowired annotation can also be used on constructors. In the above example, when the annotation is used on a constructor, an instance of FooFormatter is injected as an argument to the constructor when FooService is created:

 

String...

可變參數

至關於String[]