默认情况下如何设置对象参数

Question

是否可以如下所述设置对象的参数之一，但使其像类默认值一样，而不是每个对象的单独方法。

对象 object = new Object(a, b, c = a+b)

例如。

public FootballTeams(String name) {
    this.name = name;
    this.gamesQuant = 0;
    this.wins = 0;
    this.draws = 0;
    this.looses = 0;
    this.setPoints(this.wins,this.draws);
}
//constructor
public void setPoints(int wins, int draws) {
    this.points = this.wins*3+this.draws;
}

我试图在构造函数和设置器中设置它，但失败了，总是只计算初始值。 谢谢你。

Answer 1

不，您应该使用构造函数重载。

public FootballTeams(String name) {
    this.name = name;
    this.gamesQuant = 0;
    this.wins = 0;
    this.draws = 0;
    this.looses = 0;
    this.setPoints(this.wins,this.draws);
}


public FootballTeams(String name, int gamesQuant) {
    this.name = name;
    this.gamesQuant = gamesQuant;
    this.wins = 0;
    this.draws = 0;
    this.looses = 0;
    this.setPoints(this.wins,this.draws);
}

或者您可以使用builder design pattern。

最终得到这样的结果（字段应该有默认值）。

FootballTeams footballTeams = FootballTeams.builder()
    .name("name")
    .gamesQuant(1)
    .wins(1)
    .build();