関連ワード:  java stream get first element from list    java stream get one element from list    java stream get first element of list or null    java 8 get first element of list    java 8 get first element of list null safe    java 8 stream get first element of list    java stream get first n elements of list    java stream find one element in list    java stream filter one element from list    java 8 get first n elements of list  
結果 : java stream get first element from list