如何在Java中重构这个HashSet

发布时间：2020-12-15 04:26:45 所属栏目：Java 来源：网络整理

导读：我是 Java新手.我有一个HashSet方法,想知道一个更好的编码以下代码的方法： public HashSetGuitar getGuitars() { HashSetGuitar guitarInformations = new HashSetGuitar(); Guitar guitar1 = new Guitar("Gibson",100,"1987"); Guitar guitar2 = new Guita

我是 Java新手.我有一个HashSet方法,想知道一个更好的编码以下代码的方法：

public HashSet<Guitar> getGuitars() {

    HashSet<Guitar> guitarInformations = new HashSet<Guitar>();
    Guitar guitar1 = new Guitar("Gibson",100,"1987");
    Guitar guitar2 = new Guitar("Gibson",200,"1976");
    Guitar guitar3 = new Guitar("Gibson",300,"1978");
    Guitar guitar4 = new Guitar("Gibson",400,"1967");
    Guitar guitar5 = new Guitar("Gibson",500,"1967");
    Guitar guitar6 = new Guitar("Fender","1922");
    Guitar guitar7 = new Guitar("Fender","1999");
    Guitar guitar8 = new Guitar("Fender","1986");
    Guitar guitar9 = new Guitar("Fender","1933");
    Guitar guitar10 = new Guitar("Fender","1988");
    guitarInformations.add(guitar1);
    guitarInformations.add(guitar2);
    guitarInformations.add(guitar3);
    guitarInformations.add(guitar4);
    guitarInformations.add(guitar5);
    guitarInformations.add(guitar6);
    guitarInformations.add(guitar7);
    guitarInformations.add(guitar8);
    guitarInformations.add(guitar9);
    guitarInformations.add(guitar10);

    return guitarInformations;
}

做这样的事最有效的方法是什么？

解决方法

我会用：

return new HashSet(Arrays.asList(
    new Guitar("Gibson","1987"),new Guitar("Gibson","1976"),"1978"),"1967"),"1967")));

当然,如果你永远不会修改你的集合,那么如果你把它作为一个常量会更有效：

private static final Set<Guitar> GUITARS = 
   Collections.unmodifiableSet(new HashSet(Arrays.asList(
      ...

 public Set<Guitar> getGuitars() {
     return GUITARS;
 }

（编辑：李大同）

【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容!