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; }
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