public class Member {
    String id;
    String name;
    int age;
    public Member(String id){
        this(id,"",0);
    }
    public Member(String id,String name){
        this(id,name,0);
    }
    public Member(String id,String name,int age){
        this.id = id;
        this.name = name;
        this.age = age;
    }
    public String getId(){
        return id;
    }
    public String getName(){
        return name;
    }
    public int getAge(){
        return age;
    }
}