Effective Java second editionãèªã¿å§ããã®ã§ãããä½ã ãè¯ãã§ãããããã¯ã ã§ãJavaç´ äººã®ç§ã¯è²ã ç®ããé±ãªã®ã§ãããæåã®æ¹ã«è¼ã£ã¦ããBuilderãã¿ã¼ã³ãæ ¼å¥½è¯ãã£ãã®ã§ãæãåºããªããæ¸ãç´ãã¦ã¿ã¾ããã class Foo { private final int age; private final String name; private final String phone; private final String email; static class Builder { private int age; private String name; private String phone; private String email; public Builder age(int age) { this.age = age; retur
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