Java中的泛型

Posted 2020-10-06 firs大风吹

return new ArcResponse<Product>(HttpStatus.CREATED.value(), "创建成功", product);

如果让我写，我会这么写。用object代替泛型T

public class ArcResponse{

           public ArcResponse(int httpStatus,String msg,Object data){//用object来接收数据，应该是多了强制类型转化

                 this.data = data;

                meta = new meta();                

           }

}

public class ArcResponse<T> {

    private Meta meta;

    private T data;

    public ArcResponse() {

    }

    public ArcResponse(Meta meta, T data) {
        this.meta = meta;
        this.data = data;
    }

    public ArcResponse(Integer code, String message) {
        this.meta = new Meta(code, message);
        this.data = (T)new Object();
    }

    public ArcResponse(Integer code, String message, T data) {
        this.meta = new Meta(code, message);
        this.data = data;
    }

    public Meta getMeta() {
        return meta;
    }

    public void setMeta(Meta meta) {
        this.meta = meta;
    }

    public T getData() {
        return data;
    }

    public void setData(T data) {
        this.data = data;
    }
}