HashMap<int[],string>通过考虑它们的值来映射整数数组

时间:2022-10-17
本文介绍了HashMap<int[],string>通过考虑它们的值来映射整数数组的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

问题描述

Given the following code, I get a null (what I want is "1234"). But I wish to have a map that could consider the key as equals, if the contents of int[] are equals (rather than consider that the references of int[]), how should I do it?

HashMap<int[], String> maps=new HashMap<int[], String>();
int[] i=new int[]{1,2,3};
int[] j=new int[]{1,2,3};
maps.put(i,"1234");
System.out.print(maps.get(j));

I am opened to any map that allows keeping int[] as the key (including TreeMap) and so on, with the side condition that if that does not hamper on the effectiveness of the map accessing time.

解决方案

No way to do that with arrays, because they don't override equals() and hashCode(). You should define your own class wrapping the array, which would override equals() and hashCode() or use a List<Integer> as key instead.

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