时代Java，与您同行！关注微信公众号，关注前沿技术，微信搜索：nowjava或时代Java，也可点击这里扫码关注

时代Java

Java 静态变量，用于维护内存中Employee对象数量的计数

欢马劈雪

工程师 (已认证)

原创分享签约作者

发表于实例源码

392

静态变量，用于维护内存中Employee对象数量的计数

实例源码：

源代码：

执行

执行中...

public class Main /**from NowJava.com - 时  代  Java**/

{

public static void main(String[] args)

{

// show that count is 0 before creating Employees

System.out.printf("Employees before instantiation: %d%n",

Employee.getCount());

// create two Employees; count should be 2

Employee e1 = new Employee("Ana", "Bates");

Employee e2 = new Employee("Mary", "Lady");

// show that count is 2 after creating two Employees

System.out.printf("%nEmployees after instantiation:%n");

System.out.printf("via e1.getCount(): %d%n", e1.getCount());

System.out.printf("via e2.getCount(): %d%n", e2.getCount());
      /**
      n o w  j a v a  . c o m
      **/

System.out.printf("via Employee.getCount(): %d%n",

Employee.getCount());

// get names of Employees

System.out.printf("%nEmployee 1: %s %s%nEmployee 2: %s %s%n",

e1.getFirstName(), e1.getLastName(),

e2.getFirstName(), e2.getLastName());

}

class Employee

{

private static int count = 0; // number of Employees created

private String firstName;

private String lastName;

// initialize Employee, add 1 to static count and

// output String indicating that constructor was called

public Employee(String firstName, String lastName)

{

this.firstName = firstName;

this.lastName = lastName;

++count;  // increment static count of employees

System.out.printf("Employee constructor: %s %s; count = %d%n",

firstName, lastName, count);

}

// get first name
/**代码未完, 请加载全部代码(NowJava.com).**/

编辑/阅读全部代码

执行结果：

本文系作者在时代Java发表，未经许可，不得转载。如有侵权，请联系nowjava@qq.com删除。

编辑于 2020-03-26 09:23:272020-03-26 09:23:27

实例源码

实例源码订阅