比較java中2個字符串數組的元素

Question

我有 2 個字符串數組，比如 A 和 B。都包含一些字符串。 我想將數組 A 與 B 進行比較以找到兩個數組中都存在的元素.....

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

我需要的結果是 alpha 和 beta ......

Answer 1

您可以使用Collection retainAll方法。

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

如果你想要兩個數組的交集，你可以看看這里： Java，找到兩個數組的交集。