【单选题】. ______ online shopping has accounted for a large part of the total purchase volume, many people think the traditional shopping style is irreplaceable.
【简答题】class Person{ String name,department; int age; public Person(Stringn){name=n;} public Person(String n, int a){name=n;age=a;} publicPerson(String n,String d,int a){ doing the same as two argumentsversi...