类(class)是构造对象的模板或蓝图。
对象的行为是用可调用的方法定义的.
import java.time.*; public class EmployeeTest{ public static void main(String[] args){ } } class Employee{ // instance fields --------> object's state private String name; private double salary; private LocalDate hireDay; // constructors -------> create object public Employee(String name, double salary, int year, int month, int day){ this.name = name; this.salary = salary; hireDay = LocalDate.of(year, month, day); } // methods ----> object's behavior public String getName(){ return name; } public double getSalary(){ return salary; } public LocalDate getHireDay(){ return hireDay; } }