関連ワード:  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 8 stream filter findfirst orelse example    java 8 stream find first match    java 8 stream find first with condition    java 8 stream filter findfirst