One of the nasty little traps a Java developer can run into occurs when Collection.contains(Object) is not used with appropriate understanding. I demonstrate this ...
It's not terribly clean, but you could use indexOf() and check if it returns -1. Better than breaking out a loop.
一部の結果でアクセス不可の可能性があるため、非表示になっています。
アクセス不可の結果を表示する