Regular Ball Super Ball

4897 단어 super
Description:
Regular Ball Super Ball
Create a class Ball.
Ball objects should accept one argument for "ball type"when instantiated.
If no arguments are given, ball objects should instantiate with a "ball type"of "regular."
using System;

public class Ball {
  public string ballType { get; set; }
  public Ball(){
    ballType = "regular";
  }
  public Ball(string ballType) {
    this.ballType=ballType;
  }
}

다른 사람의 해법:
1: Optional Arguments를 사용했습니다. C#4.0의 새로운 기능입니다. 
What's New in Visual C# 2010  
using System;

public class Ball {
  public string ballType { get; set; }
  
  public Ball(string ballType = "regular") {
    this.ballType = ballType;
  }
}

두 번째
구조 함수에서this를 사용하는 것에 관해서는 이것을 참고할 수 있다https://msdn.microsoft.com/zh-cn/library/ms173115(v=vs.110).aspx
using System;

public class Ball {
  public string ballType { get; set; }
  
  public Ball(string ballType) {
     this.ballType = ballType;
  }
  
  public Ball(): this("regular"){}
}

 A constructor can invoke another constructor in the same object by using the  this  keyword. Like base, this can be used with or without parameters, and any parameters in the constructor are available as parameters tothis, or as part of an expression. For example, the second constructor in the previous example can be rewritten using this:
public Employee(int weeklySalary, int numberOfWeeks)
    : this(weeklySalary * numberOfWeeks)
{
}

The use of the this keyword in the previous example causes this constructor to be called:
public Employee(int annualSalary)
{
    salary = annualSalary;
}

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