java - 检查具有特定属性的对象是否已存在

Question

我的计划允许将足球教练分配到球队。

private String name;
private Team team;

public Coach(String name, Team team){
    this.name = name;
    this.team = team;
}

如何检查具有特定 'Team' 的 'Coach' 对象是否已存在。我想阻止两名教练被分配到同一个团队。

String name = nameField.getText();
Team team = (Team) teamComboBox.getSelectedItem();

// I only want this to run, if the team doesn't already have a coach
Coach coach = new Coach(name, team);

我花了几个小时阅读类似的问题，但我无法让任何代码工作。任何帮助将不胜感激，我正在拔头发。

Answer 1

你必须将你的教练存储在某种集合中。鉴于您所说的具体用例，Map<Team, Coach>似乎合适:

Map<Team, Coach> coachesByTeam = new HashMap<>();
if (!coachesByTeam.containsKey(team)) {
    Coach coach = new Coach(name, team);
    coachesByTeam.put(team, coach);
}