如何检查双数组的唯一性？

Question

例如，我们有

String [][] doubleArray = {{"a","1"},{"b","3"},{"a","1"},{"c","1"}};。

如何创建只有唯一子阵列的新数组：

{{"a","1"},{"b","3"},{"c","1"}}

什么我tryed：

Set <String []> uniq = new HashSet<String []>(Arrays.asList(doubleArray));

但Java犯规看到{"a","1"}和{"a","1"}之间的区别，所以uniq返回doubleArray的所有子阵列的集合，包括克隆。

Answer 1

您可以使用Map这样的：

String [][] doubleArray = {{"a","1"},{"b","3"},{"a","1"},{"c","1"}}; 
Map<String, String> map = new HashMap<>(); 
for (String[] strings : doubleArray) { 
    map.put(strings[0], strings[1]); 
} 
System.out.println("map = " + map); 

结果：

map = {a=1, b=3, c=1}