デザインモード構成者モード

*    builder   

    public class Student {

    private int id;
    private String name;
    private String passwd;
    private String sex;
    private String address;

    //          
    private Student() {
    }

    //          
    private Student(Student origin) {
        //     
         this.id = origin.id;
        this.name = origin.name;
        this.passwd = origin.passwd;
        this.sex = origin.sex;
        this.address = origin.address;
    }

    public int getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    public String getPasswd() {
        return passwd;
    }

    public String getSex() {
        return sex;
    }

    public String getAddress() {
        return address;
    }

    /**
     * Student       Student.Builder，             
     *
     */
    public static class Builder {

        private Student target;

        public Builder() {
            target = new Student();
        }

        public Builder address(int id) {
            target.id = id;
            return this;
        }

        public Builder name(String name) {
            target.name = name;
            return this;
        }

        public Builder password(String passwd) {
            target.passwd = passwd;
            return this;
        }

        public Builder sex(String sex) {
            target.sex = sex;
            return this;
        }

        public Builder address(String address) {
            target.address = address;
            return this;
        }

        public Student build() {
            return new Student(target);
        }
    
    }

}

  public class Student {

  private int id;
  private String name;
  private String passwd;
  private String sex;
  private String address;

  public Student() {
  }

  public Student(String name, String passwd, String sex, String address) {
      super();
        this.name = name;
        this.passwd = passwd;
        this.sex = sex;
        this.address = address;
  }

  public int getId() {
      return id;
  }

  public void setId(int id) {
      this.id = id;
  }

  public String getName() {
      return name;
  }

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

  public String getPasswd() {
      return passwd;
  }

  public void setPasswd(String passwd) {
      this.passwd = passwd;
  }

  public String getSex() {
      return sex;
  }

  public void setSex(String sex) {
      this.sex = sex;
  }

  public String getAddress() {
      return address;
  }

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

Student s = newStudent.Builder().name("CC").password("qwerty").sex(" ").address("xxx").build();