@Autowired使用几个场景

@Autowired使用几个场景

---

1. 直接用成员变量

@Autowired
    private CompactDisc cd;
    @Autowired
    private Power power;

2. 构造函数注入

@Autowired
    public CDPlayer(CompactDisc cd, Power power) {
        this.cd = cd;
        this.power = power;
        System.out.println("CDPlayer的多惨构造函数");
    }

3. setter方法中注入

@Autowired
    public void setCd(CompactDisc cd) {
        this.cd = cd;
        System.out.println("调用setCD");
    }
    @Autowired
    public void setPower(Power power) {
        this.power = power;
        System.out.println("调用setPower");
    }

4. 任意一个函数（我是这么理解的）

@Autowired
    public void prepare(CompactDisc cd,Power power){
        this.cd=cd;
        this.power=power;
        System.out.println("调用prepa");
    }