ããªãã¼ãªãã¨ãã§ãªãã¨ããã ä¾ãã°æ°å¤ã表ãNumNodeã足ãç®ã表ãAddNodeããããã®ã¤ã³ã¿ã¼ãã§ã¼ã¹ã¨ãªãNodeãããã¨ãã¾ãã ã§ãè¨ç®ãå®è£ ããå ´åNodeã«calcã¡ã½ããã¨ãå®ç¾©ãã¦NumNodeã¨AddNodeã§å®è£ ãã¾ãã package visitor; public interface Node1 { int calc(); } class NumNode1 implements Node1 { public final int value; public NumNode1(int value) { this.value = value; } @Override public int calc() { return value; } } class AddNode1 implements Node1 { public final Node1 left; p
ä»åã¯ï¼Visitorãã¿ã¼ã³ï¼ä¸è¨ã§ããã¨ãã¼ã¿æ§é ï¼ã¤ã¾ãã¢ãã«ï¼ã«Visitï¼è¨ªåï¼ãã¦å¦çãããã¿ã¼ã³ï¼ç®çã¯ã¢ãã«ã¨ã¢ãã«ãå¦çãããã¸ãã¯ã®åé¢ã§ãï¼å®ã¯ä½¿ã£ããã¨ããªãï½ ããæ©ä¼ãªã®ã§èãã¦ã¿ããã¨æãã¾ãï¼ Wikipedia Visitorãã¿ã¼ã³ ã¾ãã¯äºä¾ãã ãã¤ãã®ãã¨ã,ãã¤ã¡ããã®ãµã³ãã«ãæ¹ç·¨ï¼ ã¢ãã«ã«ç´æ¥ãã¸ãã¯ãæ¸ãã®ã§ã¯ãªãï¼Visitorãåãå ¥ãã¦ãã®Visitorã«ã¢ãã«ï¼èªåèªèº«ï¼ã渡ãï¼ãã¸ãã¯ãå®è¡ããã¤ã¡ã¼ã¸ã§ãï¼ ãããããã¨ã§ã¢ãã«ã¨ãã¸ãã¯ãåé¢ã§ããã¨ãããã¿ã¼ã³ãªãã§ããï¼åConverterã®convertã¡ã½ããã§æ¸¡ãããTable, Columnã®ã¢ãã«ã«ç¨æããVisitorã訪åããã¦å¦çããã¦ãã¾ãï¼ public interface Acceptor { public void accept(Visitor v
Builderãã¿ã¼ã³ å人çã«Builderãã¿ã¼ã³ã¯ãªãã¸ã§ã¯ãã®çæå¶å¾¡ãããã®ã«ãã£ã¦ã¯å¯èªæ§ãé«ãã¦å¥½ããªãã¿ã¼ã³ãªãã§ããããã®å®è£ ã«ã¯ç¨éã«ãã£ã¦ããã¤ããã¿ã¼ã³ãããã®ã§ãã¾ã¨ãã¦ã¿ã¾ããã çæãããªãã¸ã§ã¯ãã®æ¡ä»¶ ã¯ã©ã¹å:People ãã£ã¼ã«ã:String name(å¿ é ), Integer age(å¿ é ), String hobby(ãªãã·ã§ã³) å¿ é è¦ç´ ã¯nullãç¦æ¢ Peopleã¯ã©ã¹ã¯Stringãè¿ãå¤ã¨ããhelloã¡ã½ãããæ㤠ä»åã¯Builderãã¿ã¼ã³ã®æ¯è¼ã®ããããã¿ã¼ã³ä¸å¿ è¦ã§ãªãéãgetterãªã©ã®ã¡ã½ããã¯çç¥ Native Builder Builderãã¿ã¼ã³ã§ã¯ãªãããã ã®ã³ã³ã¹ãã©ã¯ã¿ãBuilderãã¿ã¼ã³ã使ããããªãã®ã¯ããããããããªãããã ãã©ãæ¯è¼ã®ããã«è¨è¼ã class People { private S
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