package com.itheima.demo;
import java.util.*;
/**
@author Cay Horstmann
*/
public class ConstructorTest
{
public static void main(String[] args)
{
// fill the staff array with three Employee objects
Employee[] staff = new Employee[3];
staff[0] = new Employee("Harry", 40000);
System.out.println();
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
{
Random generator = new Random();
// set nextId 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);
System.out.println(Employee.nextId);
}
// the default constructor
public Employee()
{
// name initialized to ""--see above
// salary not explicitly set--initialized to 0
// id initialized in initialization block
}
public String getName()
{
return name;
}
public double getSalary()
{
return salary;
}
public int getId()
{
return id;
}
}
图中#1402是nextId,如果创建对象时先运行初始化代码块,此时不是应该是nextId=1403吗?
静态(你加了static)构造块只会执行一次。一般构造块先执行,然后调用你构造函数,构造函数又调用了另一个构造函数。
所以1204 1204 1205,没毛病,你说的1403是什么鬼。