関連ワード:  why functional interface is required in java    why functional interface is introduced in java 8    why functional interface is used in java    why functional interface is introduced in java    why functional interface in java    why functional interface in java has one abstract method    why functional interface in java 8    why functional interface in java have only one method    why need functional interface in java    why do we need java interface  
結果 : why functional interface is required in java