156 lines
2.6 KiB
Go
156 lines
2.6 KiB
Go
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package main
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import (
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"fmt"
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"math"
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)
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type Shape interface {
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Area() float64
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Perimeter() float64
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}
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type Rectangle struct {
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Width float64
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Height float64
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}
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type Circle struct {
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Radius float64
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}
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func (r Rectangle) Area() float64 {
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return ____
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}
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func (r Rectangle) Perimeter() float64 {
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return ____
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}
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func (c Circle) Area() float64 {
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return math.Pi * ____ * ____
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}
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func (c Circle) Perimeter() float64 {
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return 2 * math.Pi * ____
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}
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type ShapePrinter interface {
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PrintInfo()
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}
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func (r Rectangle) PrintInfo() {
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fmt.Printf("矩形 - 宽: %.2f, 高: %.2f\n", ____, ____)
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}
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func (c Circle) PrintInfo() {
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fmt.Printf("圆形 - 半径: %.2f\n", ____)
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}
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func exercise1() float64 {
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fmt.Println("=== 练习1：矩形接口实现 ===")
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rect := Rectangle{Width: 10, Height: 5}
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area := ____
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perimeter := ____
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fmt.Printf("矩形面积: %.2f, 周长: %.2f\n", area, perimeter)
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return ____
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}
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func exercise2() string {
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fmt.Println("=== 练习2：圆形接口实现 ===")
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circle := Circle{Radius: 7}
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area := ____
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info := fmt.Sprintf("圆形面积: %.2f", area)
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fmt.Println(____)
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return ____
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}
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func exercise3() string {
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fmt.Println("=== 练习3：多态 ===")
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// 定义一个Shape类型的变量，分别指向Rectangle和Circle
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var s Shape
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s = ____
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fmt.Printf("形状类型: %T, 面积: %.2f\n", s, s.____())
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s = ____
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fmt.Printf("形状类型: %T, 面积: %.2f\n", s, s.____())
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return "多态演示完成"
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}
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func exercise4() interface{} {
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fmt.Println("=== 练习4：空接口 ===")
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// 空接口可以持有任何类型
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var data interface{}
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data = ____
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fmt.Printf("数据: %v, 类型: %T\n", data, data)
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data = ____
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fmt.Printf("数据: %v, 类型: %T\n", data, data)
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data = ____
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fmt.Printf("数据: %v, 类型: %T\n", data, data)
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return ____
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}
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type Animal interface {
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Sound() string
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}
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type Dog struct{}
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func (d Dog) Sound() string {
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return "汪汪"
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}
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type Cat struct{}
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func (c Cat) Sound() string {
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return ____
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}
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func exercise5() string {
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fmt.Println("=== 练习5：接口组合与使用 ===")
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// 创建Animal切片，包含不同的动物
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animals := []Animal{____, ____}
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for _, animal := range ____ {
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fmt.Printf("动物发出的声音: %s\n", animal.____())
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}
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return "动物接口演示完成"
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}
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func main() {
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fmt.Println("=== 接口 练习 ===\n")
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result1 := exercise1()
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fmt.Printf("练习1结果: %.2f\n", result1)
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result2 := exercise2()
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fmt.Printf("练习2结果: %s\n", result2)
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result3 := exercise3()
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fmt.Printf("练习3结果: %s\n", result3)
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result4 := exercise4()
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fmt.Printf("练习4结果: %v (类型: %T)\n", result4, result4)
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result5 := exercise5()
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fmt.Printf("练习5结果: %s\n", result5)
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}
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