Introduce Constant  

 

ÀÌ ¼½¼ÇÀº Introduce Constant  ¸®ÆÑÅ丵 ±â´É¿¡ ´ëÇÏ¿© ´ç½Å¿¡°Ô Æ÷°ýÀûÀΠoverview ¸¦ Á¦°øÇϰí how   ÀÌ ¸®ÆÑÅ丵 ±â´ÉÀÌ IntelliJ IDEA¿¡¼­ »ç¿ëµÉ ¼ö Àִ°¡¸¦ Á¦°øÇÕ´Ï´Ù.

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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


»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...  Å¬¸¯ÇϽʽÿÀ.
 2.   ´ç½ÅÀº Introduce Constant ´ÙÀ̾ó·Î±×¸¦ º¼ °ÍÀÔ´Ï´Ù.

Constant (static  final field) of type: 

¸¸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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»ó¼ö¸¦ »ý¼ºÇÒ À̸§À» ÀÔ·ÂÇϰųª ¶Ç´Â IDEA¿¡ ÀÇÇØ Á¦¾ÈµÈ Çϳª¸¦ »ç¿ëÇÕ´Ï´Ù.

°¡½Ã¼º

ÀÌ »ó¼ö¸¦ À§ÇÑ °¡½Ã¼º ¹üÀ§¸¦ ¼±ÅÃÇÕ´Ï´Ù:  private, package local, protected ¶Ç´Â public. 

Ç¥Çö½ÄÀÇ ¸ðµç ¹ß»ýÀ» ±³Ã¼ ( <number of occurrences found>  )  

¸¸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.

»èÁ¦ º¯¼ö ¼±¾ð

¸¸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>  )  Ã¼Å© ¹Ú½º°¡ ¼±ÅÃµÈ´Ù¸é ±×°ÍÀº °¡´ÉÇØÁý´Ï´Ù.

¸¸ÀÏ ¼±ÅõǸé, º¯¼ö ¼±¾ðÀº »èÁ¦µÉ °ÍÀÔ´Ï´Ù.


¸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: