java - 实现构建器模式时无法将字符串转换为构建器类错误

Question

实现构建器模式时无法将字符串转换为构建器类错误。请让我知道我做错了什么以及哪里做错了。谢谢。

封装BuilderDesignPattern;

公共(public)类员工{

private final int id;
private String Name;
private String Address;

private Employee(EmployeeBuilder empB){

//此行类型不匹配时出现错误，无法将字符串转换为 Employee.EmployeeBuilder。

    this.id = empB.getId();
    this.Name = empB.getName();
    this.Address = empB.getAddress();

}

public static class EmployeeBuilder{

    private int id;
    private String Name;
    private String Address;
    public EmployeeBuilder setId(int id) {
        this.id = id;
        return this;
    }
    public EmployeeBuilder setName(String name) {
        Name = name;
        return this;
    }
    public EmployeeBuilder setAddress(String address) {
        Address = address;
        return this;
    }
    public EmployeeBuilder getId() {
        return this;
    }
    public EmployeeBuilder getName() {
        return this;
    }
    public EmployeeBuilder getAddress() {
        return this;
    }

    public Employee build(){

        return new Employee(this);
    }

}

}

Answer 1

你的 getter 是错误的，没有返回正确的字段。应该是这样的:

public int getId() {
    return this.Id;
}
public String getName() {
    return this.Name;
}
public String getAddress() {
    return this.Address;
}

P.S.:在java中，有一个用小写字母命名字段的约定。

P.S.2:这不是一流的构建器，因为构建的类“了解”构建器。