[英]How to write Builder Pattern for class that extends abstract class in Java?
我有扩展抽象 class“用户”的“客户”class:
public abstract class User {
private Long id;
private String firstName;
private String lastName;
private String email;
//getters and setters
}
public class Client extends User{
private List<Account> accountList;
//getters and setters
}
我已经为“客户端”class 编写了构建器,但是我无法访问用户的字段(id、firstName、lastName、email)以在构建中使用它。 怎么做?
public class Client extends User {
private List<Account> accountList;
public static Builder builder() {
return new Client().new Builder();
}
public class Builder {
private Builder() {
}
public Builder setAccountList(List<Account> accountList) {
Client.this.accountList = accountList;
return this;
}
public Client build() {
return Client.this;
}
}
}
这是解决方法:
public final class Client extends User {
private List<Account> accountList;
public List<Account> getAccountList() {
return accountList;
}
public void setAccountList(List<Account> accountList) {
this.accountList = accountList;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Client client = (Client) o;
return Objects.equals(accountList, client.accountList);
}
@Override
public int hashCode() {
return Objects.hash(accountList);
}
public static Builder builder() {
return new Client().new Builder();
}
public class Builder {
private Builder() {
}
public Builder accountList(List<Account> accountList) {
Client.this.accountList = accountList;
return this;
}
public Builder id(Long id) {
Client.this.setId(id);
return this;
}
public Builder firstName(String firstName) {
Client.this.setFirstName(firstName);
return this;
}
public Builder lastName(String lastName) {
Client.this.setLastName(lastName);
return this;
}
public Builder email(String email) {
Client.this.setEmail(email);
return this;
}
public Builder password(String password) {
Client.this.setPassword(password);
return this;
}
public Builder role(User.Role role) {
Client.this.setRole(role);
return this;
}
public Builder dateOfBirth(LocalDate dateOfBirth) {
Client.this.setDateOfBirth(dateOfBirth);
return this;
}
public Client build() {
return Client.this;
}
}
}
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