java基础知识---(类的声明之人类)

Person(人类的声明):

publicclass Person {    private Stringusername;     public Stringsex;privateint age;//不带参数的构造方法       public Person(){System.out.println("=======不带参数的构造方法");}   //自定义带参数的构造方法public Person(String username ,String sex ,int age ){this.username=username;this.sex=sex;this.age=age;}   //自定义seter和geter方法    public String getUsername() {returnusername;}publicvoid setUsername(String username) {this.username = username;}publicint getAge() {returnage;}publicvoid setAge(int age) {this.age = age;}public String getSex() {returnsex;   }   publicvoid setSex(String sex) {this.sex = sex;   }}***测试调取***publicclass test1 {    publicstatic void main(String[] args) {      Person p=new Person("张飞","男",11);    p.sex="男";    p.setSex("女");    System.out.println("这个人的信息是:"+p.getUsername()+p.getSex()+p.getAge());    }}

***打印结果***

这个人的信息是:张飞女11