Spring自定义@Qualifier

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

import javax.inject.Qualifier;

@Target({ElementType.FIELD,ElementType.PARAMETER,ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Qualifier
public @interface StringedInstrument {

}

@StringedInstrument
public class Guitar extends Instrument {

}

public class Instrument {
private String name;
private String sound;

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getSound() {
return sound;
}

public void setSound(String sound) {
this.sound = sound;
}

}