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CH11.1 OK
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eBook/11.1.md
226
eBook/11.1.md
@@ -2,7 +2,7 @@
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Go <20><><EFBFBD>Բ<EFBFBD><D4B2><EFBFBD>һ<EFBFBD><D2BB> *<2A><><EFBFBD><EFBFBD>ͳ<EFBFBD><CDB3>* <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԣ<EFBFBD><D4A3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>û<EFBFBD><C3BB><EFBFBD><EFBFBD><EFBFBD>ͼ̳еĸ<D0B5><C4B8>
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD> Go <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>зdz<D0B7><C7B3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> **<EFBFBD>ӿ<EFBFBD>** <20><><EFBFBD>ͨ<EEA3AC><CDA8><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD>ֺܶ<D6BA><DCB6><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԡ<EFBFBD><D4A1>ӿ<EFBFBD><D3BF>ṩ<EFBFBD><E1B9A9>һ<EFBFBD>ַ<EFBFBD>ʽ<EFBFBD><CABD> **˵<EFBFBD><EFBFBD>** <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><CEAA><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˭<EFBFBD>ܸ㶨<DCB8><E3B6A8><EFBFBD><EFBFBD><EFBFBD>£<EFBFBD><C2A3><EFBFBD><EFBFBD>Ϳ<EFBFBD><CDBF><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD> Go <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>зdz<D0B7><C7B3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> **<EFBFBD>ӿ<EFBFBD>** <20><><EFBFBD>ͨ<EEA3AC><CDA8><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD>ֺܶ<D6BA><DCB6><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԡ<EFBFBD><D4A1>ӿ<EFBFBD><D3BF>ṩ<EFBFBD><E1B9A9>һ<EFBFBD>ַ<EFBFBD>ʽ<EFBFBD><CABD> **˵<EFBFBD><EFBFBD>** <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><CEAA><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˭<EFBFBD>ܸ㶨<DCB8><E3B6A8><EFBFBD><EFBFBD><EFBFBD>£<EFBFBD><C2A3><EFBFBD><EFBFBD>Ϳ<EFBFBD><CDBF><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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<EFBFBD>ӿڶ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD>鷽<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Щ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD>֣<EFBFBD><EFBFBD><EFBFBD><EFBFBD>룺<EFBFBD><EFBFBD><EFBFBD><EFBFBD>û<EFBFBD>б<EFBFBD>ʵ<EFBFBD>֣<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>dz<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ģ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ӿ<EFBFBD><EFBFBD><EFBFBD>Ҳ<EFBFBD><EFBFBD><EFBFBD>ܰ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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@@ -16,7 +16,7 @@ type Namer interface {
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}
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```
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> `Namer` <20><>һ<EFBFBD><D2BB> **<EFBFBD>ӿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>**.
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> `Namer` <20><>һ<EFBFBD><D2BB> **<EFBFBD>ӿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>**<EFBFBD><EFBFBD>
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Լ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ģ<EFBFBD><EFBFBD>ӿڵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɷ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> `[e]r` <20><><EFBFBD><D7BA><EFBFBD>ɣ<EFBFBD><C9A3><EFBFBD><EFBFBD><EFBFBD> `Printer`<EFBFBD><EFBFBD>`Reader`<EFBFBD><EFBFBD>`Writer`<EFBFBD><EFBFBD>`Logger`<EFBFBD><EFBFBD>`Converter`<EFBFBD>ȵȡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һЩ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>õķ<EFBFBD>ʽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>`er`<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>`Recoverable`<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD>ӿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>`able`<EFBFBD><EFBFBD>β<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> `I` <20><>ͷ<EFBFBD><CDB7><EFBFBD><EFBFBD> `.NET` <20><> `Java` <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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@@ -28,6 +28,226 @@ Go
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<EFBFBD>˴<EFBFBD><EFBFBD>ķ<EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͨ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD>乹<EFBFBD><EFBFBD><EFBFBD>ġ<EFBFBD>
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<EFBFBD><EFBFBD><EFBFBD>ͣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ṹ<EFBFBD>壩ʵ<EFBFBD>ֽӿڷ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>еķ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ÿһ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD><EFBFBD>˵<EFBFBD><EFBFBD><EFBFBD>˴˷<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڸ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>͵ģ<EFBFBD>** <20><><EFBFBD><EFBFBD>ʵ<EFBFBD>ֽӿ<D6BD> **<EFBFBD><EFBFBD>ͬʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˸<EFBFBD><EFBFBD><EFBFBD><EFBFBD>͵Ľӿڡ<EFBFBD>ʵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD> `Namer` <20>ӿ<EFBFBD><D3BF><EFBFBD><EFBFBD>͵ı<CDB5><C4B1><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ը<EFBFBD>ֵ<EFBFBD><D6B5> `ai` <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ<EFBFBD><D6B5><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>е<EFBFBD>ָ<EFBFBD><D6B8><EFBFBD><EFBFBD>ָ<EFBFBD><D6B8><EFBFBD><EFBFBD>ʵ<EFBFBD>ֵĽӿڷ<D3BF><DAB7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ȼ<EFBFBD><C8BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD><EFBFBD><EFBFBD>ͣ<EFBFBD>Ҳʵ<D2B2><CAB5><EFBFBD>˸ýӿڣ<D3BF><DAA3>ı<EFBFBD><C4B1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ<EFBFBD><D6B5>`ai`<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ߣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ע<EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD>ͷ<EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD>֣<EFBFBD>Ҳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>֮<EFBFBD>ı䡣
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** <20><><EFBFBD>Ͳ<EFBFBD><CDB2><EFBFBD>Ҫ<EFBFBD><D2AA>ʽ<EFBFBD><CABD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD><CAB5><EFBFBD><EFBFBD>ij<EFBFBD><C4B3><EFBFBD>ӿڣ<D3BF><DAA3>ӿڱ<D3BF><DAB1><EFBFBD>ʽ<EFBFBD><CABD>ʵ<EFBFBD>֡<EFBFBD><D6A1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϳ<EFBFBD><CDBF><EFBFBD>ʵ<EFBFBD><CAB5>ͬһ<CDAC><D2BB><EFBFBD>ӿ<EFBFBD> **<EFBFBD><EFBFBD>
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** ʵ<><CAB5>ij<EFBFBD><C4B3><EFBFBD>ӿڵ<D3BF><DAB5><EFBFBD><EFBFBD>ͣ<EFBFBD><CDA3><EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD>ֽӿڷ<D3BF><DAB7><EFBFBD><EFBFBD>⣩<EFBFBD><E2A3A9><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ķ<EFBFBD><C4B7><EFBFBD>**<2A><>
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** һ<><D2BB><EFBFBD><EFBFBD><EFBFBD>Ϳ<EFBFBD><CDBF><EFBFBD>ʵ<EFBFBD>ֶ<EFBFBD><D6B6><EFBFBD><EFBFBD>ӿ<EFBFBD> **<EFBFBD><EFBFBD>
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** <20>ӿ<EFBFBD><D3BF><EFBFBD><EFBFBD>Ϳ<EFBFBD><CDBF><EFBFBD><D4B0><EFBFBD>һ<EFBFBD><D2BB>ʵ<EFBFBD><CAB5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ã<EFBFBD> <20><>ʵ<EFBFBD><CAB5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD><CAB5><EFBFBD>˴˽ӿڣ<D3BF><DAA3>ӿ<EFBFBD><D3BF>Ƕ<EFBFBD>̬<EFBFBD><CCAC><EFBFBD>ͣ<EFBFBD> **<EFBFBD><EFBFBD>
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<EFBFBD><EFBFBD>ʹ<EFBFBD>ӿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>֮<EFBFBD><EFBFBD><EFBFBD>Ŷ<EFBFBD><EFBFBD>壬<EFBFBD><EFBFBD><EFBFBD>ߴ<EFBFBD><EFBFBD>ڲ<EFBFBD>ͬ<EFBFBD>İ<EFBFBD><EFBFBD>У<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>룺ֻҪ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD><EFBFBD><EFBFBD>˽ӿ<EFBFBD><EFBFBD>еķ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD><EFBFBD><EFBFBD>˴˽ӿڡ<EFBFBD>
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Щ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD>ýӿھ<EFBFBD><EFBFBD>кܴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԡ<EFBFBD>
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<EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ӣ<EFBFBD>
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ʾ<EFBFBD><EFBFBD> 11.1 interfaces.go<67><6F>
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```go
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package main
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import "fmt"
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type Shaper interface {
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Area() float32
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}
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type Square struct {
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side float32
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}
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func (sq *Square) Area() float32 {
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return sq.side * sq.side
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}
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func main() {
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sq1 := new(Square)
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sq1.side = 5
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// var areaIntf Shaper
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// areaIntf = sq1
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// shorter,without separate declaration:
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// areaIntf := Shaper(sq1)
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// or even:
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areaIntf := sq1
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fmt.Printf("The square has area: %f\n", areaIntf.Area())
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}
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```
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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The square has area: 25.000000
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ij<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD>ṹ<EFBFBD><EFBFBD> `Square` <20><>һ<EFBFBD><D2BB><EFBFBD>ӿ<EFBFBD> `Shaper`<EFBFBD><EFBFBD><EFBFBD>ӿ<EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> `Area()`<EFBFBD><EFBFBD>
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<EFBFBD><EFBFBD> `main()` <20><><EFBFBD><EFBFBD><EFBFBD>д<EFBFBD><D0B4><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><D2BB> `Square` <20><>ʵ<EFBFBD><CAB5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>߶<EFBFBD><DFB6><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> `Square`<EFBFBD><EFBFBD><EFBFBD><EFBFBD> `Area()`<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ε<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ṹ<EFBFBD><EFBFBD> `Square` ʵ<><CAB5><EFBFBD>˽ӿ<CBBD> `Shaper` <20><>
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<EFBFBD><EFBFBD><EFBFBD>Կ<EFBFBD><EFBFBD>Խ<EFBFBD>һ<EFBFBD><EFBFBD> `Square` <20><><EFBFBD>͵ı<CDB5><C4B1><EFBFBD><EFBFBD><EFBFBD>ֵ<EFBFBD><D6B5>һ<EFBFBD><D2BB><EFBFBD>ӿ<EFBFBD><D3BF><EFBFBD><EFBFBD>͵ı<CDB5><C4B1><EFBFBD><EFBFBD><EFBFBD>`areaIntf = sq1` <20><>
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<EFBFBD><EFBFBD><EFBFBD>ڽӿڱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD> `Square` <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ã<EFBFBD>ͨ<EFBFBD><CDA8><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ե<EFBFBD><D4B5><EFBFBD> `Square` <20>ϵķ<CFB5><C4B7><EFBFBD> `Area()`<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȻҲ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD> `Square` <20><>ʵ<EFBFBD><CAB5><EFBFBD>ϵ<EFBFBD><CFB5>ô˷<C3B4><CBB7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڽӿ<DABD>ʵ<EFBFBD><CAB5><EFBFBD>ϵ<EFBFBD><CFB5>ô˷<C3B4><CBB7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˷ܣ<CBB7><DCA3><EFBFBD>ʹ<EFBFBD>˷<EFBFBD><CBB7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD>ԡ<EFBFBD><D4A1>ӿڱ<D3BF><DAB1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˽<EFBFBD><CBBD><EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD><CAB5><EFBFBD><EFBFBD>ֵ<EFBFBD><D6B5>ָ<EFBFBD><D6B8><EFBFBD><EFBFBD>Ӧ<EFBFBD><D3A6><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD>롣
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD> **<EFBFBD><EFBFBD>̬** <20><> Go <20>汾<EFBFBD><E6B1BE><EFBFBD><EFBFBD>̬<EFBFBD><CCAC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD><EFBFBD>Ϊ<EFBFBD><CEAA>֪<EFBFBD>ĸ<EFBFBD><C4B8><EFBFBD><EEA3BA><EFBFBD>ݵ<EFBFBD>ǰ<EFBFBD><C7B0><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ѡ<EFBFBD><D1A1><EFBFBD><EFBFBD>ȷ<EFBFBD>ķ<EFBFBD><C4B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˵<EFBFBD><CBB5>ͬһ<CDAC><D2BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڲ<EFBFBD>ͬ<EFBFBD><CDAC>ʵ<EFBFBD><CAB5><EFBFBD><EFBFBD><EFBFBD>ƺ<EFBFBD><C6BA><EFBFBD><EFBFBD>ֳ<EFBFBD><D6B3><EFBFBD>ͬ<EFBFBD><CDAC><EFBFBD><EFBFBD>Ϊ<EFBFBD><CEAA>
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD> `Square` û<><C3BB>ʵ<EFBFBD><CAB5> `Area()` <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ĵ<EFBFBD><C4B4><EFBFBD><EFBFBD><EFBFBD>Ϣ<EFBFBD><CFA2>
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cannot use sq1 (type *Square) as type Shaper in assignment:
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*Square does not implement Shaper (missing Area method)
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD> `Shaper` <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD> `Perimeter()`<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>`Square` û<><C3BB>ʵ<EFBFBD><CAB5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹû<CAB9><C3BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD> `Square` ʵ<><CAB5><EFBFBD>ϵ<EFBFBD><CFB5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҳ<EFBFBD><D2B2><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͬ<EFBFBD><CDAC><EFBFBD>Ĵ<EFBFBD><C4B4><EFBFBD><EFBFBD><EFBFBD>
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|
||||
<EFBFBD><EFBFBD>չһ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ӣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> `Rectangle` Ҳʵ<D2B2><CAB5><EFBFBD><EFBFBD> `Shaper` <20>ӿڡ<D3BF><DAA1><EFBFBD><EFBFBD>Ŵ<EFBFBD><C5B4><EFBFBD>һ<EFBFBD><D2BB> `Shaper` <20><><EFBFBD>͵<EFBFBD><CDB5><EFBFBD><EFBFBD>飬<EFBFBD><E9A3AC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ÿһ<C3BF><D2BB>Ԫ<EFBFBD>ز<EFBFBD><D8B2><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> `Area()` <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Դ<EFBFBD><D4B4><EFBFBD>չʾ<D5B9><CABE>̬<EFBFBD><CCAC>Ϊ<EFBFBD><CEAA>
|
||||
|
||||
ʾ<EFBFBD><EFBFBD> 11.2 interfaces_poly.go<67><6F>
|
||||
|
||||
```go
|
||||
package main
|
||||
|
||||
import "fmt"
|
||||
|
||||
type Shaper interface {
|
||||
Area() float32
|
||||
}
|
||||
|
||||
type Square struct {
|
||||
side float32
|
||||
}
|
||||
|
||||
func (sq *Square) Area() float32 {
|
||||
return sq.side * sq.side
|
||||
}
|
||||
|
||||
type Rectangle struct {
|
||||
length, width float32
|
||||
}
|
||||
|
||||
func (r Rectangle) Area() float32 {
|
||||
return r.length * r.width
|
||||
}
|
||||
|
||||
func main() {
|
||||
|
||||
r := Rectangle{5, 3} // Area() of Rectangle needs a value
|
||||
q := &Square{5} // Area() of Square needs a pointer
|
||||
// shapes := []Shaper{Shaper(r), Shaper(q)}
|
||||
// or shorter
|
||||
shapes := []Shaper{r, q}
|
||||
fmt.Println("Looping through shapes for area ...")
|
||||
for n, _ := range shapes {
|
||||
fmt.Println("Shape details: ", shapes[n])
|
||||
fmt.Println("Area of this shape is: ", shapes[n].Area())
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
Looping through shapes for area ...
|
||||
Shape details: {5 3}
|
||||
Area of this shape is: 15
|
||||
Shape details: &{5}
|
||||
Area of this shape is: 25
|
||||
|
||||
<EFBFBD>ڵ<EFBFBD><EFBFBD><EFBFBD> `shapes[n].Area()) ` <20><><EFBFBD><EFBFBD>ʱ<EFBFBD><CAB1>ֻ֪<D6BB><D6AA> `shapes[n]` <20><>һ<EFBFBD><D2BB> `Shaper` <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ҡ<EFBFBD><D2A1>һ<EFBFBD><D2BB><EFBFBD><EFBFBD>Ϊ<EFBFBD><CEAA>һ<EFBFBD><D2BB> `Square` <20><> `Rectangle` <20><><EFBFBD><EFBFBD><F3A3ACB2>ұ<EFBFBD><D2B1>ֳ<EFBFBD><D6B3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӧ<EFBFBD><D3A6><EFBFBD><EFBFBD>Ϊ<EFBFBD><CEAA>
|
||||
|
||||
Ҳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڿ<EFBFBD>ʼ<EFBFBD>㽫<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͨ<EFBFBD><EFBFBD><EFBFBD>ӿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>β<EFBFBD><EFBFBD><EFBFBD> **<EFBFBD><EFBFBD><EFBFBD>ɾ<EFBFBD>**<2A><>**<2A><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>** <20><> **<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>չ<EFBFBD><EFBFBD>** <20>Ĵ<EFBFBD><C4B4>롣<EFBFBD><EBA1A3> 11.12.3 <20>н<EFBFBD><D0BD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڿ<EFBFBD><DABF><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><CEAA><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>µĽӿ<C4BD><D3BF>Ƕ<EFBFBD>ô<EFBFBD><C3B4><EFBFBD><EFBFBD><EFBFBD>ס<EFBFBD>
|
||||
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ӣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> `stockPosition` <20><> `car`<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƕ<EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD> `getValue()` <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǿ<EFBFBD><C7BF>Զ<EFBFBD><D4B6><EFBFBD>һ<EFBFBD><D2BB><EFBFBD><EFBFBD><EFBFBD>д˷<D0B4><CBB7><EFBFBD><EFBFBD>Ľӿ<C4BD> `valuable`<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ŷ<EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD> `valuable`<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ĺ<EFBFBD><EFBFBD><EFBFBD> `showValue()`<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD> `valuable` <20>ӿڵ<D3BF><DAB5><EFBFBD><EFBFBD>Ͷ<EFBFBD><CDB6><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
ʾ<EFBFBD><EFBFBD> 11.3 valuable.go<67><6F>
|
||||
|
||||
```go
|
||||
package main
|
||||
|
||||
import "fmt"
|
||||
|
||||
type stockPosition struct {
|
||||
ticker string
|
||||
sharePrice float32
|
||||
count float32
|
||||
}
|
||||
|
||||
/* method to determine the value of a stock position */
|
||||
func (s stockPosition) getValue() float32 {
|
||||
return s.sharePrice * s.count
|
||||
}
|
||||
|
||||
type car struct {
|
||||
make string
|
||||
model string
|
||||
price float32
|
||||
}
|
||||
|
||||
/* method to determine the value of a car */
|
||||
func (c car) getValue() float32 {
|
||||
return c.price
|
||||
}
|
||||
|
||||
/* contract that defines different things that have value */
|
||||
type valuable interface {
|
||||
getValue() float32
|
||||
}
|
||||
|
||||
func showValue(asset valuable) {
|
||||
fmt.Printf("Value of the asset is %f\n", asset.getValue())
|
||||
}
|
||||
|
||||
func main() {
|
||||
var o valuable = stockPosition{"GOOG", 577.20, 4}
|
||||
showValue(o)
|
||||
o = car{"BMW", "M3", 66500}
|
||||
showValue(o)
|
||||
}
|
||||
```
|
||||
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||||
|
||||
Value of the asset is 2308.800049
|
||||
Value of the asset is 66500.000000
|
||||
|
||||
** һ<><D2BB><EFBFBD><EFBFBD><EFBFBD><D7BC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> **
|
||||
|
||||
`io`<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD>ӿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> `Reader`:
|
||||
|
||||
```go
|
||||
type Reader interface {
|
||||
Read(p []byte) (n int, err error)
|
||||
}
|
||||
```
|
||||
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> `r`<EFBFBD><EFBFBD>` var r io.Reader`
|
||||
|
||||
<EFBFBD><EFBFBD>ô<EFBFBD>Ϳ<EFBFBD><EFBFBD><EFBFBD>д<EFBFBD><EFBFBD><EFBFBD>µĴ<EFBFBD><EFBFBD>룺
|
||||
|
||||
```go
|
||||
var r io.Reader
|
||||
r = os.Stdin // see 12.1
|
||||
r = bufio.NewReader(r)
|
||||
r = new(bytes.Buffer)
|
||||
f,_ := os.Open("test.txt")
|
||||
r = bufio.NewReader(f)
|
||||
```
|
||||
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD> `r` <20>ұߵ<D2B1><DFB5><EFBFBD><EFBFBD>Ͷ<EFBFBD>ʵ<EFBFBD><CAB5><EFBFBD><EFBFBD> `Read()` <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͬ<EFBFBD>ķ<EFBFBD><C4B7><EFBFBD>ǩ<EFBFBD><C7A9><EFBFBD><EFBFBD>`r` <20>ľ<EFBFBD>̬<EFBFBD><CCAC><EFBFBD><EFBFBD><EFBFBD><EFBFBD> `io.Reader`<EFBFBD><EFBFBD>
|
||||
|
||||
**<EFBFBD><EFBFBD>ע**
|
||||
|
||||
<EFBFBD>е<EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͬ<EFBFBD>ķ<EFBFBD>ʽ<EFBFBD><EFBFBD>ʹ<EFBFBD>ýӿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʣ<EFBFBD><EFBFBD><EFBFBD>ij<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>͵ĽǶ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ľӿ<EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD>ǣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>е<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>û<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʽ<EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD>Щ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ⶨһ<EFBFBD><EFBFBD><EFBFBD>ӿڶ<EFBFBD><EFBFBD>ѡ<EFBFBD>
|
||||
|
||||
<EFBFBD><EFBFBD>ϰ 11.1<EFBFBD><EFBFBD>simple_interface.go
|
||||
|
||||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD>ӿ<EFBFBD> `Simpler`<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD> `Get()` <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><D2BB> `Set()`<EFBFBD><EFBFBD>`Get()`<EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ<EFBFBD><EFBFBD>`Set()` <20><>һ<EFBFBD><D2BB><EFBFBD><EFBFBD><EFBFBD>Ͳ<EFBFBD><CDB2><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD>ṹ<EFBFBD><E1B9B9><EFBFBD><EFBFBD><EFBFBD><EFBFBD> `Simple` ʵ<><CAB5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ӿڡ<D3BF>
|
||||
|
||||
<EFBFBD><EFBFBD><EFBFBD>Ŷ<EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD> `Simpler` <20><><EFBFBD>͵IJ<CDB5><C4B2><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ò<EFBFBD><C3B2><EFBFBD><EFBFBD><EFBFBD> `Get()` <20><> `Set()` <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> `main` <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƿ<EFBFBD><C7B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȷ<EFBFBD><C8B7><EFBFBD>С<EFBFBD>
|
||||
|
||||
<EFBFBD><EFBFBD>ϰ 11.2<EFBFBD><EFBFBD>interfaces_poly2.go
|
||||
|
||||
a) <20><>չ interfaces_poly.go <20>е<EFBFBD><D0B5><EFBFBD><EFBFBD>ӣ<EFBFBD><D3A3><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><D2BB> `Circle` <20><><EFBFBD><EFBFBD>
|
||||
|
||||
b) ʹ<><CAB9>һ<EFBFBD><D2BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> `Shape`<EFBFBD><EFBFBD>û<EFBFBD><EFBFBD><EFBFBD>ֶΣ<EFBFBD> ʵ<><CAB5>ͬ<EFBFBD><CDAC><EFBFBD>Ĺ<EFBFBD><C4B9>ܣ<EFBFBD><DCA3><EFBFBD>ʵ<EFBFBD>ֽӿ<D6BD> `Shaper`<EFBFBD><EFBFBD>Ȼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƕ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>͡<EFBFBD><EFBFBD><EFBFBD>չ 10.6.5 <20>е<EFBFBD><D0B5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˵<EFBFBD><CBB5><EFBFBD><EFBFBD>д<EFBFBD><D0B4>
|
||||
|
||||
- [Ŀ¼](directory.md)
|
||||
- <20><>һ<EFBFBD>£<EFBFBD>[11 <20>ӿڣ<D3BF>Interfaces<65><73><EFBFBD>뷴<EFBFBD>䣨reflection<6F><6E>](11.0.md)
|
||||
- <20><>һ<EFBFBD>ڣ<EFBFBD>[<EFBFBD>ӿ<EFBFBD><EFBFBD><EFBFBD>Ƕ<EFBFBD>ӿ<EFBFBD>](11.2.md)
|
||||
- <20><>һ<EFBFBD>ڣ<EFBFBD>[<EFBFBD>ӿ<EFBFBD>Ƕ<EFBFBD>ӿ<EFBFBD>](11.2.md)
|
||||
@@ -93,7 +93,8 @@
|
||||
- 10.6 [方法](10.6.md)
|
||||
- 10.7 [类型的 String() 方法和格式化描述符](10.7.md)
|
||||
- 10.8 [垃圾回收和 SetFinalizer](10.8.md)
|
||||
- 第11章：接口（interface）与反射（reflection）
|
||||
- 第11章：[接口（interface）与反射（reflection）](11.0.md)）
|
||||
- 11.1 [接口是什么](11.1.md)
|
||||
|
||||
## 第三部分：Go 高级编程
|
||||
|
||||
|
||||
Reference in New Issue
Block a user