在java中比较2个字符串数组中的元素

Question

我有2个字符串数组，它们都是A和B. 都包含一些字符串。我想比较B排列一个发现这是两个阵列中存在的元素.....

String[] a=new String[] {"alpha","beta"}; 
String[] b=new String[] {"alpha","beta","gamma","xxxx","yyyy"}; 

这是我需要的结果是α和β...

Answer 1

您可以使用retainAll方法从Collection。

String[] a=new String[] {"alpha","beta"}; 
String[] b=new String[] {"alpha","beta","gamma","xxxx","yyyy"}; 
HashSet<String> set1 = new HashSet<String>(Arrays.asList(a)); 
HashSet<String> set2 = new HashSet<String>(Arrays.asList(b)); 
set1.retainAll(set2); 
System.out.println(set1);  //Output : [alpha, beta] 

Answer 2

如果你想要两个阵列的交集，你可以看看这里：Java, find intersection of two arrays。