Java 中的链式编程
前言
在写项目的时候,有一个实体类有好多个属性,new 出来之后需要不停的使用setXXX( )方法,效率低而且代码可读性差,查询了下发现可以实现实体类的链式编程。
public class User {
private Integer id;
private String userName;
private String password;
private String nikeName;
private String email;
private String phoneNum;
/**
setter/getter方法省略
*/
}
- 测试类中的赋值操作
User user = new User();
user.setId(1);
user.setEmail("xxxx");
user.setUserName("test");
user.setPassword("5454");
user.setNikeName("swds");
user.setPhoneNum("17575");
一、 在setter方法中实现链式编程
- 修改setter方法的返回值为实体类类型,添加
return this;
语句
public class User {
private Integer id;
private String userName;
private String password;
private String nikeName;
private String email;
private String phoneNum;
public Integer getId() {
return id;
}
public User setId(Integer id) {
this.id = id;
return this;
}
public String getUserName() {
return userName;
}
public User setUserName(String userName) {
this.userName = userName;
return this;
}
public String getPassword() {
return password;
}
public String getNikeName() {
return nikeName;
}
public User setNikeName(String nikeName) {
this.nikeName = nikeName;
return this;
}
public String getEmail() {
return email;
}
public User setEmail(String email) {
this.email = email;
return this;
}
public String getPhoneNum() {
return phoneNum;
}
public User setPhoneNum(String phoneNum) {
this.phoneNum = phoneNum;
return this;
}
public User setPassword(String password) {
this.password = password;
return this;
}
}
- 在测试类中实现了链式编程
User user = new User();
user.setId(1).setUserName("sdd").setPhoneNum("sdsd").setNikeName("dsdsd").setEmail("xxxxx").setPassword("122");
二、 使用lombok实现链式编程
- 使用lombok之前,必须确保你的IDEA或者Eclipse中安装了lombok插件
- 在项目中导入lombok的依赖
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.12</version>
</dependency>
- 在实体类上添加
@Accessors(chain = true)
注解即可开启链式编程
@Accessors(chain = true) // 开启链式编程
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
private Integer id;
private String userName;
private String password;
private String nikeName;
private String email;
private String phoneNum;
}