這個Java程序簡單,充滿意見的,所以你可以fast.however理解,爲什麼在構建員工[1],該計劃先去聲明:java的構造爲了
this("Employee #" + nextId, s);
然後去對象初始化塊,然後回到說法,怎麼confusion.why不是第一次使用對象初始化塊
import java.util.*;
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);
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
{
// 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()
{
// name initialized to ""--see below
// 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;
}
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++;
}
}
什麼問題? – MasterCassim
聽起來就像你在問爲什麼'this'語句在實例初始化塊之前執行。那是對的嗎? –