関連ワード:  java list stream findfirst    java list stream findfirst match    java 8 stream findfirst    java 8 stream findfirst example    java 8 stream findfirst or else    java 8 stream findfirst vs findany    java 8 stream findfirst ifpresent    java 8 stream filter findfirst example    java list stream filter find first    java stream findfirst empty list