69 lines
1.2 KiB
Go
69 lines
1.2 KiB
Go
package extension_test
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import (
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"fmt"
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"testing"
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)
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// golang是可以实现继承的，但是这种继承并不是严格意义上的继承，
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// golang并不支持继承特性，因而也没有单继承,多继承，重写方法等复杂概念。
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type Pet struct {
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}
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func (p *Pet) Speak() {
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fmt.Println("...")
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}
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func (p *Pet) SpeakTo(host string) {
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p.Speak()
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fmt.Println(host)
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}
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// 有名继承
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type Dog struct {
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p *Pet
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}
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func (d *Dog) Speak() {
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fmt.Println("汪汪汪!")
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}
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func TestDog(t *testing.T) {
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dog := new(Dog)
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dog.Speak()
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// dog.SpeakTo("Zhang") Dog没有这个方法, 虽然Pet有，但是此时Dog不是匿名继承 ，如果要要调用需要指定继承事指定的名称。
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dog.p.Speak()
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dog.p.SpeakTo("Li")
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}
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// 匿名继承
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type People struct {
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}
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func (p *People) ShowA() {
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fmt.Println("AAA")
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}
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func (p *People) ShowB() {
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fmt.Println("BBB")
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}
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type Doctor struct {
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People
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}
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func (p *Doctor) ShowA() {
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fmt.Println("Doctor AAA")
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}
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func TestDoctor(t *testing.T) {
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d := new(Doctor)
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d.ShowA()
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d.ShowB() // 因为Teacher没有ShowB()的方法，此时又匿名继承了People，所以会调到People实现的ShowB方法
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d.People.ShowA()
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d.People.ShowB()
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}
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