JAva javabeanとListはテーブルデータを格納する(Listでクラスを格納する)

class User{
    private int id;
    private double salary;
    private String name;
    private String hiredate;
    public User()
    {

}

public User(int id, double salary, String name, String hiredate) {
    super();
    this.id = id;
    this.salary = salary;
    this.name = name;
    this.hiredate = hiredate;
}

public int getId() {
    return id;
}
public void setId(int id) {
    this.id = id;
}
public double getSalary() {
    return salary;
}
public void setSalary(double salary) {
    this.salary = salary;
}
public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
public String getHiredate() {
    return hiredate;
}
public void setHiredate(String hiredate) {
    this.hiredate = hiredate;
}

public String toString()
{
    return "id:"+id+"salary:"+salary+"name:"+name+"hiredate:"+hiredate;
}

public  class test {

//      Map   ，     list   ， List    Map
public static void main(String[]args)
{

User user1=new User(1001,11,"  ","2018.5.5");
User user2=new User(1002,10,"  2","2018.5.52");
User user3=new User(1003,9,"  3","2018.5.53");
List list=new ArrayList<>();

list.add(user1);
list.add(user2);
list.add(user3);
    for(User v:list)
    {   
        System.out.println(v);
    }
Map map=new HashMap<>();
map.put(1, user1);
map.put(2, user2);
map.put(3, user3);
Set key=map.keySet();
for(Integer i:key)
{
    System.out.println(map.get(i));
}
}

//   javabean     set get  ，        
class User{
private int id;
private double salary;
private String name;
private String hiredate;
public User()
{

}

public User(int id, double salary, String name, String hiredate) {
    super();
    this.id = id;
    this.salary = salary;
    this.name = name;
    this.hiredate = hiredate;
}

public int getId() {
    return id;
}
public void setId(int id) {
    this.id = id;
}
public double getSalary() {
    return salary;
}
public void setSalary(double salary) {
    this.salary = salary;
}
public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
public String getHiredate() {
    return hiredate;
}
public void setHiredate(String hiredate) {
    this.hiredate = hiredate;
}

public String toString()
{
    return "id:"+id+"salary:"+salary+"name:"+name+"hiredate:"+hiredate;
}