デザインパターンの使い方: Builder

// Material.java: public class Material { private String classification; private String title; private String director; private String year; public Material(String classification, String title, String director, String year) { this.classification = classification; this.title = title; this.director = director; this.year = year; } public String getAuthor() { return director; } public String getClassi

[fragarach_the_sword]

Builderパターン例