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Language	Swift
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class SuperClass {
    var corners = 4
    var description: String {
        return "\(corners) 边"
    }
}
let rectangle = SuperClass()
print("矩形: \(rectangle.description)")
 
class SubClass: SuperClass {
    override init() {  //重载构造器
 
 
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Lines	10

Snippet Metadata
Owner	w3xue
Created	3 years ago
Modified	3 years ago
Visibility	Public