java 中设计模式（值对象）的实例详解

import java.io.Serializable;

//值对象的命名规范: XxxValueObject, XxxVO, XxxModel

//1实现序列化接口
public class AddressVO implements Serializable {
  private static final long serialVersionUID = 1L;
  // 2私有化所有成员变量
  private String userId;
  private String name;
  private int age;
  private boolean man; //变量名建议不要取成isMan(JSP碰到这种情况会有bug)
  private String address;

  // 3 必须要有一个默认的空参构造
  public AddressVO() {
  }

  // 4 写所有成员变量的setter-getter方法---boolean型变量的getter方法写成isXXX()的形式
  public String getUserId() {
    return userId;
  }

  public void setUserId(String userId) {
    this.userId = userId;
  }

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public int getAge() {
    return age;
  }

  public void setAge(int age) {
    this.age = age;
  }

  public boolean isMan() {
    return man;
  }

  public void setMan(boolean man) {
    this.man = man;
  }

  public String getAddress() {
    return address;
  }

  public void setAddress(String address) {
    this.address = address;
  }

  //5 建议写equals,hashCode,toString这几个方法
  @Override
  public int hashCode() {
    final int prime = 31;
    int result = 1;
    result = prime * result + ((userId == null) ? 0 : userId.hashCode());
    return result;
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj)
      return true;
    if (obj == null)
      return false;
    if (getClass() != obj.getClass())
      return false;
    AddressVO other = (AddressVO) obj;
    if (userId == null) {
      if (other.userId != null)
        return false;
    } else if (!userId.equals(other.userId))
      return false;
    return true;
  }

  @Override
  public String toString() {
    return "AddressVO [userId=" + userId + ", name=" + name + ", age="
        + age + ", man=" + man + ", address=" + address + "]";
  }


}