ÀÌ ¼½¼ÇÀº Introduce Constant ¸®ÆÑÅ丵 ±â´É¿¡ ´ëÇÏ¿© ´ç½Å¿¡°Ô Æ÷°ýÀûÀÎ overview ¸¦ Á¦°øÇϰí how ÀÌ ¸®ÆÑÅ丵 ±â´ÉÀÌ IntelliJ IDEA¿¡¼ »ç¿ëµÉ ¼ö Àִ°¡¸¦ Á¦°øÇÕ´Ï´Ù.
Introduce Constant ¸®ÆÑÅ丵Àº »ç¿ëÀÚ¿¡ Á¤ÀûÀÎ ÃÖÁ¾ÀûÀÎ Çʵ带 ºü¸£°Ô »ý¼ºÇÏ´Â °ÍÀ» Çã¶ôÇÏ´Â Introduce
Field ¸®ÆÑÅ丵 ±â´ÉÀÇ Æ¯º°ÇÑ °æ¿ìÀÔ´Ï´Ù.
¿¹¸¦ µé¸é, ´ç½ÅÀº ´ÙÀ½ÀÇ Äڵ带 °¡Áý´Ï´Ù:
public class AClass {
public boolean checkObj(Object o) {
return "testString".equals(o);
}
}
±×¸®°í ´ç½ÅÀº "testString"ÀÌ »ó¼ö·Î¼ Á¦°øµÇ±â¸¦ ¿øÇÕ´Ï´Ù. ¸®ÆÑÅ丵 ÈÄÀÇ ÄÚµå´Â ´ÙÀ½°ú °°ÀÌ º¸ÀÏ °ÍÀÔ´Ï´Ù:
public class AClass {
private static final String STRING = "testString";
public boolean checkObj(Object o) {
return STRING.equals(o);
}
}
»ó¼ö¸¦ »ý¼ºÇϱâ À§Çؼ:
1. º¯¼ö¿¡¼ÀÇ Ä³·µÀ» ¼³Á¤Çϰųª, ¿¡µðÅÍ¿¡¼ Á¤ÀûÀÎ ÃÖÁ¾ Çʵ尡 µÇ´Â ½ºÅ×ÀÌÆ®¸ÕÆ®¸¦ ¼±ÅÃÇϰí Ctrl + Alt + C ¸¦ ´©¸£°Å³ª ¶Ç´Â ¸ÞÀÎ ¸Þ´º »ó¿¡¼ ¶Ç´Â ÀÌ Ç׸ñ¿¡¼ ¿À¸¥ÂÊ ¹öưÀ» Ŭ¸¯ÇÏ¿© ºÒ·ÁÁö´Â ÆË¾÷ ¸Þ´º¿¡¼ Refactor |
Introduce Constant... Ŭ¸¯ÇϽʽÿÀ.
2. ´ç½ÅÀº Introduce Constant ´ÙÀ̾ó·Î±×¸¦ º¼ °ÍÀÔ´Ï´Ù.

Constant (static final
field) of type:
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¸¸ÀÏ ±×°ÍÀÌ ¸î °³ÀÇ Å¸ÀÔ°ú ÇÔ²² ÇÒ´çµÉ ¼ö ÀÖÀ¸¸é µå·Ó-´Ù¿î ¹Ú½º¿¡¼ »ó¼ö¸¦ »ý¼ºÇÒ Å¸ÀÔÀ» ¼±ÅÃÇÕ´Ï´Ù.
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À̸§
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»ó¼ö¸¦ »ý¼ºÇÒ À̸§À» ÀÔ·ÂÇϰųª ¶Ç´Â IDEA¿¡ ÀÇÇØ Á¦¾ÈµÈ Çϳª¸¦ »ç¿ëÇÕ´Ï´Ù.
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°¡½Ã¼º
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ÀÌ »ó¼ö¸¦ À§ÇÑ °¡½Ã¼º ¹üÀ§¸¦ ¼±ÅÃÇÕ´Ï´Ù: private, package local,
protected ¶Ç´Â public.
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Ç¥Çö½ÄÀÇ ¸ðµç ¹ß»ýÀ» ±³Ã¼ ( <number of occurrences found> )
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¸¸ÀÏ ¼±ÅÃµÈ Ç¥Çö½ÄÀÇ ´ÙÁß ¹ß»ýÀÌ ÀÖÀ¸¸é üũ ¹Ú½º°¡ ³ªÅ¸³³´Ï´Ù.
±×µé ¸ðµÎ´Â ¿¡µðÅÍ¿¡¼ °Á¶µÉ °ÍÀÔ´Ï´Ù.
¸¸ÀÏ ¼±ÅõǸé, ¸ðµç ½ºÅ×ÀÌÆ®¸ÕÆ®/Ç¥Çö½Ä ¹ß»ýÀº ±³Ã¼µÉ °ÍÀÔ´Ï´Ù. ±×·¸Áö ¾ÊÀ¸¸é, ´ç½ÅÀÌ ¿À·ÎÁö óÀ½¿¡ ÁöÁ¤Çß´ø Çϳª°¡ º¯°æµÉ °ÍÀÔ´Ï´Ù.
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»èÁ¦ º¯¼ö ¼±¾ð
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¸¸ÀÏ ´ç½ÅÀÌ ·ÎÄà º¯¼ö À§¿¡¼ ÀÌ ¸®ÆÑÅ丵À» Àû¿ëÇϸé üũ ¹Ú½º°¡ ³ªÅ¸³³´Ï´Ù.
Replace all occurrences of expression ( <number
of occurrences found> ) üũ ¹Ú½º°¡ ¼±ÅÃµÈ´Ù¸é ±×°ÍÀº °¡´ÉÇØÁý´Ï´Ù.
¸¸ÀÏ ¼±ÅõǸé, º¯¼ö ¼±¾ðÀº »èÁ¦µÉ °ÍÀÔ´Ï´Ù.

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¸ðµç ½ºÅ×ÀÌÆ®¸ÕÆ®¿Í Ç¥Çö½Ä¿¡¼ ´ç½ÅÀÌ ÀÌ ¿É¼ÇÀ» »ç¿ëÇÏ´Â °ÍÀ» ÁÖÀÇÇØ¾ß¸¸ ÇÑ´Ù´Â °ÍÀ» °¨¾ÈÇϽʽÿÀ.
»õ·Ó°Ô »ý¼ºµÈ »ó¼ö´Â ·ÎÄà º¯¼ö ´ë½Å¿¡ »ç¿ëµÉ °ÍÀÔ´Ï´Ù.
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¼±ÅÃµÈ Ç¥Çö½ÄÀÌ ºñ Á¤ÀûÀÎ ÇÊµå ¶Ç´Â ºñ Á¤ÀûÀÎ ¸Þ¼Òµå ÄÝÀ» °¡Áø´Ù¸é, ´ç½Å¿¡°Ô ´ÙÀ½ÀÇ ¿¡·¯ ¸Þ½ÃÁö°¡ ÇÁ·ÒÇÁÆ® µÉ °ÍÀÔ´Ï´Ù:

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