在java中比較2個字符串數組中的元素

Question

我有2個字符串數組，它們都是A和B. 都包含一些字符串。我想比較B排列一個發現這是兩個陣列中存在的元素.....

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

這是我需要的結果是α和β...

Answer 1

您可以使用retainAll方法從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

如果你想要兩個陣列的交集，你可以看看這裏：Java, find intersection of two arrays。