英文:
Printing nested fields on Go objects
问题
我正在尝试理解下面的代码，如何打印出"species"和"width"键的值。
package main
import (
"encoding/json"
"fmt"
)
type Dimensions struct {
Height int
Width int
}
type Bird struct {
Species string
Description string
Dimensions Dimensions
}
func main() {
birdJson := `{"species":"pigeon","description":"likes to perch on rocks", "dimensions":{"height":24,"width":10}}`
var bird Bird
json.Unmarshal([]byte(birdJson), &bird)
fmt.Println(bird.Species, bird.Dimensions.Width)
// 输出结果：pigeon 10
}
我期望的输出是：pigeon 和 10
英文:
I'm trying to understand from the below code, how can I print only "species" and "width" key values.
package main
import (
"encoding/json"
"fmt"
)
type Dimensions struct {
Height int
Width int
}
type Bird struct {
Species string
Description string
Dimensions Dimensions
}
func main() {
birdJson := `{"species":"pigeon","description":"likes to perch on rocks", "dimensions":{"height":24,"width":10}}`
var bird Bird
json.Unmarshal([]byte(birdJson), &bird)
fmt.Println(bird)
// {pigeon likes to perch on rocks {24 10}}
}
The output I'm expecting is: pigeon and 10
答案1
得分: 3
你在这里的做法是打印整个对象，而你应该打印你要查找的特定字段。相反，你应该尝试这样做：
fmt.Println(bird.Species, bird.Dimensions.Width)
这将输出：
鸽子 10
为了使输出更易读，你可以使用fmt.Printf，像这样：
fmt.Printf("物种：%s，宽度：%d\n", bird.Species, bird.Dimensions.Width)
这将输出：
物种：鸽子，宽度：10
英文:
What you're doing here is printing the entire object when you should be printing the specific fields you're looking for. Instead, you should try this:
fmt.Println(bird.Species, bird.Dimensions.Width)
which will yield:
> pigeon 10
To make this a bit more readable, you can use fmt.Printf like so:
fmt.Printf("Species: %s, Width: %d\n", bird.Species, bird.Dimensions.Width)
which will yeild:
> Species: pigeon, Width: 10
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