《Java 核心技术》练手小项目3-工资管理3

类与对象-补充：重载构造器，用this(…)调用另一个构造器，无参数构造器，对象初始化块，静态初始化块，实例字段初始化

import java.util.*;


public class ConstructorTest
{
	public static void main(String[] args)
	{
		var[] employee = new Employee[3];
		
		employee[0] = new Employee("ExistName",1000);
		employee[1] = new Employee(2000);
		employee[2] = new Employee();
		
		for(Employee e : employee)
			System.out.println(e.getName() + e.getId() + e.getSalary());
	}
}

class Employee
{
	private static int nextId;
	
	private String name = "";
	private double salary;
	private int id;
	static
	{
		var generator = new Random();
		nextId = generator.nextInt(10000);
	}
	
	{
		id = nextId;
		nextId++;
	}
	
	public Employee(String aName, double aSalary)
	{
		name = aName;
		salary = aSalary;
	}
	public Employee(double aSalary)
	{
		//this(...)构造器将调用同一个类的另一个构造器
		this("Employee#"+nextId,aSalary);
	}
	public Employee()
	{
		//如果一个类中提供了至少一个构造器，但是没有提供无参数的构造器，那么构造对象时如果不提供参数是不合法的。
	}
	
	public String getName()
	{
		return name;
	}
	public double getSalary()
	{
		return salary;
	}
	public int getId()
	{
		return id;
	}
}