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标准JavaBean类

1. 类名需要见名知意
2. 成员变量使用private修饰
3. 提供至少两个构造方法
   • 无参构造方法
   • 带全部参数的构造方法
4. 成员方法
   • 提供每一个成员变量对应的setXxx（）/getXxx（）
   • 如果还有其他行为，也需要写上

/*** @Author: 大海* @Date: 2025-09-07*/public class study_16_标准JavaBean {// 属性private String username;private String password;private String email;private String gender;private int age;// 空参构造方法   快捷键  Alt + Insertpublic study_16_标准JavaBean() {}// 全参构造方法public study_16_标准JavaBean(String username, String password, String email, String gender, int age) {this.username = username;this.password = password;this.email = email;this.gender = gender;this.age = age;}// getter方法public String getUsername() {return username;}public String getPassword() {return password;}public String getEmail() {return email;}public String getGender() {return gender;}public int getAge() {return age;}// setter方法    快捷键  Alt + Insert   Generate Getters and Setterspublic void setUsername(String username) {this.username = username;}public void setPassword(String password) {this.password = password;}public void setEmail(String email) {this.email = email;}public void setGender(String gender) {this.gender = gender;}public void setAge(int age) {this.age = age;}}