Java调用构造器的处理步骤

package Demo;

import java.util.Random;

public class Demo1 {
	public static void main(String[] args) {
		//fill the staff array with three Employee objects
		var staff = new Employee[3];
		staff[0] = new Employee("harry",40000);
		staff[1] = new Employee(60000);
		staff[2] = new Employee();
		//print out information about all Employee objects
		for(Employee e : staff)
			System.out.println("name " + e.getName() + ",id=" + e.getId() + ",salary=" + e.getSalary());
		
		
	}
}


class Employee
{
	private static int nextId;
	
	private int id;
	private String name = "";//instance field initialization
	private double salary;
	
	//static initialization block
	static
	{
		var generator = new Random();
		//set nexId to a random number between 0 and 9999
		nextId = generator.nextInt(10000);
	}
	
	//object initialization block
	{
		id = nextId;
		nextId++;
	}
	
	//three overloaded constructors
	public Employee(String n,double s)
	{
		name = n;
		salary = s;
	}
	
	public Employee(double s)
	{
		//calls the Employee(String,double) constructor
		this("Employee #" + nextId,s);
	}
	
	//the default constructor
	public Employee()
	{
	}
	
	public String getName()
	{
		return name;
	}
	
	public double getSalary()
	{
		return salary;
	}
	
	public int getId()
	{
		return id;
	}
	
	
}

执行结果： 

name harry,id=9635,salary=40000.0
name Employee #9636,id=9636,salary=60000.0
name ,id=9637,salary=0.0