JavaTM 2 Platform
Standard Ed. 5.0

java.math
¿­°ÅÇü RoundingMode

java.lang.Object 
  »óÀ§¸¦ È®Àå java.lang.Enum <RoundingMode >
      »óÀ§¸¦ È®Àå java.math.RoundingMode
¸ðµç ±¸ÇöµÈ ÀÎÅÍÆäÀ̽º:
Serializable, Comparable <RoundingMode >

public enum RoundingMode
extends Enum <RoundingMode >

¼Ò¼öºÎ¸¦ ÆıâÇÒ ¼ö ÀÖ´Â ¿¬»ê¿¡ ´ëÇÑ ¡¸µÕ±Ù µ¿ÀÛ¡¹À» ÁöÁ¤ÇÕ´Ï´Ù. °¢ µÕ±Ù ¸ðµå´Â ¸» ¼ö ÀÖ¾ú´ø °á°ú°¡ ¸®ÅÏµÈ ÃÖÇÏÁ¤µµÀÇ ÀÚ¸®¼öÀÇ °è»ê¹æ¹ýÀ» ÁöÁ¤ÇÕ´Ï´Ù. Á¤È®ÇÑ ¼öÄ¡ °á°ú¸¦ Ç¥ÇöÇϴµ¥ ÇÊ¿äÇÑ ÀÚ¸®¼öº¸´Ù ÀûÀº ÀÚ¸®¼ö ¹Û¿¡ ¾ø´Â °æ¿ì, ÆıâµÈ ÀÚ¸®¼ö´Â ±× ÀÚ¸®¼öÀÇ ¼öÄ¡¿¡ À־ÀÇ ¿ªÇÒ¿¡ °ü°è¾øÀÌ, ¡¸ÆıâµÈ ¼Ò¼öºÎ¡¹¶ó°í ºÒ¸³´Ï´Ù. Áï, ÆıâµÈ ¼Ò¼öºÎ´Â ¼öÄ¡·Î º¸¿©Á® 1 º¸´Ù Å« Àý´ëÄ¡¸¦ °¡Áú ¼ö°¡ ÀÖ½À´Ï´Ù.

°¢ µÕ±Ù ¸ðµåÀÇ ±â¼ú¿¡´Â 2 ÀÚ¸®¼ö°¡ ´Ù¸¥ 10 Áø¼öÄ¡¸¦, ÇØ´çÀÇ µÕ±Ù ¸ðµå·Î 1 ÀÚ¸®¼öÀÇ 10 Áø¼öÄ¡¿¡ ¸¶´Â ¹æ¹ýÀ» ³ªÅ¸³»´Â Ç¥°¡ ÀÖ½À´Ï´Ù. °Ñ(Ç¥)ÀÇ °á°ú¿­Àº ÁöÁ¤µÈ °ªÀ» °¡Áö´Â BigDecimal ¼ö¸¦ ÀÛ¼ºÇØ, ÀûÀýÇÑ ¼³Á¤ (precision°¡ 1, roundingMode°¡ ÇØ´çÀÇ µÕ±Ù ¸ðµå)À» °¡Áö´Â MathContext °´Ã¼¸¦ Çü¼ºÇØ, ÀûÀýÇÑ MathContext¸¦ »ç¿ëÇØ ÀÌ ¼öÄ¡¿¡ ´ëÇØ round¸¦ È£ÃâÇÏ´Â °ÍÀ¸·Î ÃëµæÇÒ ¼ö ÀÖ½À´Ï´Ù. ´ÙÀ½¿¡ ¸ðµç µÕ±Ù ¸ðµåÀÇ µÕ±Ù ¿¬»êÀÇ °á°ú¸¦ ³ªÅ¸³»´Â ¿ä¾à Å×À̺íÀ» ³ªÅ¸³À´Ï´Ù.

´Ù¾çÇÑ µÕ±Ù ¸ðµå¿¡¼­ÀÇ µÕ±Ù ¿¬»êÀÇ °³¿ä

ƯÁ¤ÀÇ µÕ±Ù ¸ðµå·Î ÀÔ·ÂÀ» 1 ÀÚ¸®¼ö¿¡ ¸¸ °á°ú
ÀԷµǴ ¼öÄ¡ UP DOWN CEILING FLOOR HALF_UP HALF_DOWN HALF_EVEN UNNECESSARY
5.5 6 5 6 5 6 5 6 ArithmeticException Throw
2.5 3 2 3 2 3 2 2 ArithmeticException Throw
1.6 2 1 2 1 2 2 2 ArithmeticException Throw
1.1 2 1 2 1 1 1 1 ArithmeticException Throw
1.0 1 1 1 1 1 1 1 1
-1. 0 -1 -1 -1 -1 -1 -1 -1 -1
-1. 1 -2 -1 -1 -2 -1 -1 -1 ArithmeticException Throw
-1. 6 -2 -1 -1 -2 -2 -2 -2 ArithmeticException Throw
-2. 5 -3 -2 -2 -3 -3 -2 -2 ArithmeticException Throw
-5. 5 -6 -5 -5 -6 -6 -5 -6 ArithmeticException Throw

ÀÌ enum´Â BigDecimal (BigDecimal.ROUND_UP, BigDecimal.ROUND_DOWN µî)ÀÇ µÕ±Ù ¸ðµå Á¤¼öÀÇ Á¤¼ö º£À̽ºÀÇ ¿­°Å¸¦ ¿Å°Ü³õ±â À§Çؼ­ »ç¿ëµË´Ï´Ù.

°ü·Ã Ç׸ñ:
BigDecimal, MathContext

¿­°ÅÇü Á¤¼öÀÇ °³¿ä
CEILING
          Á¤ÀÇ ¹«ÇÑ´ë¿¡ °¡±î¿öÁöµµ·Ï ¸¶´Â ¸ðµåÀÔ´Ï´Ù.
DOWN
          0¿¡ °¡±î¿öÁöµµ·Ï ¸¶´Â ¸ðµåÀÔ´Ï´Ù.
FLOOR
          ºÎÀÇ ¹«ÇÑ´ë¿¡ °¡±î¿öÁöµµ·Ï ¸¶´Â ¸ðµåÀÔ´Ï´Ù.
HALF_DOWN
           ¡¸°¡Àå °¡±î¿î ¼ýÀÚ¡¹¿¡ ¸¶´Â ¸ðµåÀÔ´Ï´Ù.
HALF_EVEN
           ¡¸°¡Àå °¡±î¿î ¼ýÀÚ¡¹¿¡ ¸¶´Â µÕ±Ù ¸ðµåÀÔ´Ï´Ù.
HALF_UP
           ¡¸°¡Àå °¡±î¿î ¼ýÀÚ¡¹¿¡ ¸¶´Â ¸ðµåÀÔ´Ï´Ù.
UNNECESSARY
          ¿ä±¸µÇ´Â ¿¬»êÀÇ °á°ú°¡ Á¤È®ÇÏ°í, µÕ±ÙÀÌ ÇÊ¿äÇÏÁö ¾ÊÀº °ÍÀ» ³ªÅ¸³»´Â µÕ±Ù ¸ðµåÀÔ´Ï´Ù.
UP
          0 ·ÎºÎÅÍ ¸Ö¾îÁöµµ·Ï ¸¶´Â ¸ðµåÀÔ´Ï´Ù.
 
¸Þ¼­µå °³¿ä
static RoundingMode valueOf (int rm)
          BigDecimal À¯»ê Á¤¼ö µÕ±Ù ¸ðµå Á¤¼ö¿¡ ´ëÀÀÇÏ´Â RoundingMode °´Ã¼¸¦ ¸®ÅÏÇÕ´Ï´Ù.
static RoundingMode valueOf (String  name)
          ÁöÁ¤ÇÑ À̸§À» °¡Áö´Â ÀÌ ÇüÅÂÀÇ ¿­°ÅÇü Á¤¼ö¸¦ ¸®ÅÏÇÕ´Ï´Ù.
static RoundingMode [] values ()
          ÀÌ ¿­°ÅÇüÀÇ Á¤¼ö¸¦ Æ÷ÇÔÇÑ ¹è¿­ÀÌ ¼±¾ðµÇ°í ÀÖ´Â ¼ø¼­·Î ¸®ÅÏÇÕ´Ï´Ù.
 
Ŭ·¡½º java.lang. Enum ·ÎºÎÅÍ »ó¼ÓµÈ ¸Þ¼­µå
clone, compareTo, equals, getDeclaringClass, hashCode, name, ordinal, toString, valueOf
 
Ŭ·¡½º java.lang. Object ·ÎºÎÅÍ »ó¼ÓµÈ ¸Þ¼­µå
finalize, getClass, notify, notifyAll, wait, wait, wait
 

¿­°ÅÇü Á¤¼öÀÇ »ó¼¼

UP

public static final RoundingMode  UP
0 À¸·ÎºÎÅÍ ¸Ö¾îÁöµµ·Ï ¸¶´Â ¸ðµåÀÔ´Ï´Ù. ÆıâµÇ´Â 0 ÀÌ¿ÜÀÇ ¼Ò¼öºÎ¿¡ ¼±ÇàÇÏ´Â ÀÚ¸®¼ö¸¦ Ç×»ó ´Ã¸³´Ï´Ù. ÀÌ µÕ±Ù ¸ðµå´Â °è»êµÈ °ªÀÇ Àý´ëÄ¡¸¦ ÁÙÀÌÁö ¾Ê½À´Ï´Ù.

¿¹:

ÀԷµǴ ¼öÄ¡ UP¿¡ ÇÑ µÕ±ÙÀ¸·Î
1 ÀÚ¸®¼ö¿¡ ¸» ¼ö ÀÖ¾ú´ø ÀÔ·Â
5.5 6
2.5 3
1.6 2
1.1 2
1.0 1
-1. 0 -1
-1. 1 -2
-1. 6 -2
-2. 5 -3
-5. 5 -6


DOWN

public static final RoundingMode  DOWN
0¿¡ °¡±î¿öÁöµµ·Ï ¸¶´Â ¸ðµåÀÔ´Ï´Ù. ÆıâµÇ´Â ¼Ò¼öºÎ¿¡ ¼±ÇàÇÏ´Â ÀÚ¸®¼ö¸¦ ÁõºÐ ÇÏÁö ¾Ê½À´Ï´Ù (Áï Àß¶ó¼­ ¹ö¸²). ÀÌ µÕ±Ù ¸ðµå´Â °è»êµÈ °ªÀÇ Àý´ëÄ¡¸¦ ´Ã¸®Áö ¾Ê½À´Ï´Ù.

¿¹:

ÀԷµǴ ¼öÄ¡ DOWN¿¡ ÇÑ µÕ±ÙÀ¸·Î
1 ÀÚ¸®¼ö¿¡ ¸» ¼ö ÀÖ¾ú´ø ÀÔ·Â
5.5 5
2.5 2
1.6 1
1.1 1
1.0 1
-1. 0 -1
-1. 1 -1
-1. 6 -1
-2. 5 -2
-5. 5 -5


CEILING

public static final RoundingMode  CEILING
Á¤ÀÇ ¹«ÇÑ´ë¿¡ °¡±î¿öÁöµµ·Ï ¸¶´Â ¸ðµåÀÔ´Ï´Ù. °á°ú°¡ Á¤ÀÇ °æ¿ì´Â RoundingMode.UP¿Í °°ÀÌ µ¿ÀÛÇØ, ºÎÀÇ °æ¿ì´Â RoundingMode.DOWN¿Í °°ÀÌ µ¿ÀÛÇÕ´Ï´Ù. ÀÌ µÕ±Ù ¸ðµå´Â °è»êµÈ °ªÀ» ÁÙÀÌÁö ¾Ê½À´Ï´Ù.

¿¹:

ÀԷµǴ ¼öÄ¡ CEILING¿¡ ÇÑ µÕ±ÙÀ¸·Î
1 ÀÚ¸®¼ö¿¡ ¸» ¼ö ÀÖ¾ú´ø ÀÔ·Â
5.5 6
2.5 3
1.6 2
1.1 2
1.0 1
-1. 0 -1
-1. 1 -1
-1. 6 -1
-2. 5 -2
-5. 5 -5


FLOOR

public static final RoundingMode  FLOOR
ºÎÀÇ ¹«ÇÑ´ë¿¡ °¡±î¿öÁöµµ·Ï ¸¶´Â ¸ðµåÀÔ´Ï´Ù. °á°ú°¡ Á¤ÀÇ °æ¿ì´Â RoundingMode.DOWN¿Í °°ÀÌ µ¿ÀÛÇØ, ºÎÀÇ °æ¿ì´Â RoundingMode.UP¿Í °°ÀÌ µ¿ÀÛÇÕ´Ï´Ù. ÀÌ µÕ±Ù ¸ðµå´Â °è»êµÈ °ªÀ» ´Ã¸®Áö ¾Ê½À´Ï´Ù.

¿¹:

ÀԷµǴ ¼öÄ¡ FLOOR¿¡ ÇÑ µÕ±ÙÀ¸·Î
1 ÀÚ¸®¼ö¿¡ ¸» ¼ö ÀÖ¾ú´ø ÀÔ·Â
5.5 5
2.5 2
1.6 1
1.1 1
1.0 1
-1. 0 -1
-1. 1 -2
-1. 6 -2
-2. 5 -3
-5. 5 -6


HALF_UP

public static final RoundingMode  HALF_UP
¡¸°¡Àå °¡±î¿î ¼ýÀÚ¡¹¿¡ ¸¶´Â ¸ðµåÀÔ´Ï´Ù. ´Ù¸¸, ¾çÂÊÀÌ¿ôÀÇ ¼ýÀÚ°¡ µî°Å¸®ÀÇ °æ¿ì´Â ³¡¸Î½À´Ï´Ù. ÆıâµÇ´Â ¼Ò¼öºÎ°¡ 0.5 ÀÌ»óÀÇ °æ¿ì´Â RoundingMode.UP¿Í °°ÀÌ µ¿ÀÛÇØ, ±× ¿ÜÀÇ °æ¿ì´Â RoundingMode.DOWN¿Í °°ÀÌ µ¿ÀÛÇÕ´Ï´Ù. ÀÌ°ÍÀº ¿ì¸®ÀÇ ´ëºÎºÐÀÌ ÃʵîÇб³¿¡¼­ ¹è¿î µÕ±Ù ¸ðµåÀÔ´Ï´Ù.

¿¹:

ÀԷµǴ ¼öÄ¡ HALF_UP¿¡ ÇÑ µÕ±ÙÀ¸·Î
1 ÀÚ¸®¼ö¿¡ ¸» ¼ö ÀÖ¾ú´ø ÀÔ·Â
5.5 6
2.5 3
1.6 2
1.1 1
1.0 1
-1. 0 -1
-1. 1 -1
-1. 6 -2
-2. 5 -3
-5. 5 -6


HALF_DOWN

public static final RoundingMode  HALF_DOWN
¡¸°¡Àå °¡±î¿î ¼ýÀÚ¡¹¿¡ ¸¶´Â ¸ðµåÀÔ´Ï´Ù. ´Ù¸¸, ¾çÂÊÀÌ¿ôÀÇ ¼ýÀÚ°¡ µî°Å¸®ÀÇ °æ¿ì´Â À߶ó ¹ö¸³´Ï´Ù. ÆıâµÇ´Â ¼Ò¼öºÎ°¡ 0.5¸¦ ³Ñ´Â °æ¿ì´Â RoundingMode.UP¿Í °°ÀÌ µ¿ÀÛÇØ, ±× ¿ÜÀÇ °æ¿ì´Â RoundingMode.DOWN¿Í °°ÀÌ µ¿ÀÛÇÕ´Ï´Ù.

¿¹:

ÀԷµǴ ¼öÄ¡ HALF_DOWN¿¡ ÇÑ µÕ±ÙÀ¸·Î
1 ÀÚ¸®¼ö¿¡ ¸» ¼ö ÀÖ¾ú´ø ÀÔ·Â
5.5 5
2.5 2
1.6 2
1.1 1
1.0 1
-1. 0 -1
-1. 1 -1
-1. 6 -2
-2. 5 -2
-5. 5 -5


HALF_EVEN

public static final RoundingMode  HALF_EVEN
¡¸°¡Àå °¡±î¿î ¼ýÀÚ¡¹¿¡ ¸¶´Â µÕ±Ù ¸ðµåÀÔ´Ï´Ù. ´Ù¸¸, ¾çÂÊÀÌ¿ôÀÇ ¼ýÀÚ°¡ µî°Å¸®ÀÇ °æ¿ì´Â ¦¼ö Ãø¿¡ ¸¿´Ï´Ù. ÆıâÇÏ´Â ¼Ò¼öºÎÀÇ ÁÂÃøÀÇ ÀÚ¸®¼ö°¡ Ȧ¼öÀÇ °æ¿ì´Â RoundingMode.HALF_UP¿Í °°ÀÌ µ¿ÀÛÇØ, ¦¼öÀÇ °æ¿ì´Â RoundingMode.HALF_DOWN¿Í °°ÀÌ µ¿ÀÛÇÕ´Ï´Ù. ÀÌ µÕ±Ù ¸ðµå´Â ¿¬¼ÓÇÏ´Â °è»êÀ¸·Î ¹Ýº¹ÇØ Àû¿ëµÇ´Â °æ¿ì¿¡ ´©Àû ¿¡·¯¸¦ ÃÖ¼ÒÇÑÀ¸·Î ÇÕ´Ï´Ù. ÀÌ°ÍÀº ¡¸ÀºÇà ¹æ½ÄÀÇ µÕ±Ù¡¹À¸·Î¼­µµ ¾Ë·ÁÁ® ÁÖ·Î ¹Ì±¹¿¡¼­ »ç¿ëµË´Ï´Ù. ÀÌ µÕ±Ù ¸ðµå´Â Java float ¹× double »ê¼ú ¿¬»êÀ¸·Î »ç¿ëµÇ´Â µÕ±Ù ¹æħ°ú °°½À´Ï´Ù.

¿¹:

ÀԷµǴ ¼öÄ¡ HALF_EVEN¿¡ ÇÑ µÕ±ÙÀ¸·Î
1 ÀÚ¸®¼ö¿¡ ¸» ¼ö ÀÖ¾ú´ø ÀÔ·Â
5.5 6
2.5 2
1.6 2
1.1 1
1.0 1
-1. 0 -1
-1. 1 -1
-1. 6 -2
-2. 5 -2
-5. 5 -6


UNNECESSARY

public static final RoundingMode  UNNECESSARY
¿ä±¸µÇ´Â ¿¬»êÀÇ °á°ú°¡ Á¤È®ÇÏ°í, µÕ±ÙÀÌ ÇÊ¿äÇÏÁö ¾ÊÀº °ÍÀ» ³ªÅ¸³»´Â µÕ±Ù ¸ðµåÀÔ´Ï´Ù. ÀÌ µÕ±Ù ¸ðµå°¡ °á°ú°¡ Á¤È®ÇÏÁö ¾ÊÀº ¿¬»êÀ¸·Î ÁöÁ¤µÇ´Â °æ¿ì´Â ArithmeticExceptionÀÌ ¹ß»ý µË´Ï´Ù.

¿¹:

ÀԷµǴ ¼öÄ¡ UNNECESSARY¿¡ ÇÑ µÕ±ÙÀ¸·Î
1 ÀÚ¸®¼ö¿¡ ¸» ¼ö ÀÖ¾ú´ø ÀÔ·Â
5.5 ArithmeticException Throw
2.5 ArithmeticException Throw
1.6 ArithmeticException Throw
1.1 ArithmeticException Throw
1.0 1
-1. 0 -1
-1. 1 ArithmeticException Throw
-1. 6 ArithmeticException Throw
-2. 5 ArithmeticException Throw
-5. 5 ArithmeticException Throw

¸Þ¼­µåÀÇ »ó¼¼

values

public static final RoundingMode [] values()
ÀÌ ¿­°ÅÇüÀÇ Á¤¼ö¸¦ Æ÷ÇÔÇÑ ¹è¿­ÀÌ ¼±¾ðµÇ°í ÀÖ´Â ¼ø¼­·Î ¸®ÅÏÇÕ´Ï´Ù.ÀÌ ¸Þ¼­µå´Â ´ÙÀ½°ú °°ÀÌÀÇÇØ Á¤¼ö¸¦ ¹Ýº¹Çϱâ À§Çؼ­ »ç¿ëÇÒ ¼ö ÀÖ½À´Ï´Ù:
for(RoundingMode c : RoundingMode.values())
        System.out.println(c);

¹Ýȯ°ª:
ÀÌ ¿­°ÅÇüÀÇ Á¤¼ö°¡ ¼±¾ðµÇ°í ÀÖ´Â ¼ø¼­·Î Æ÷ÇÔÇÑ ¹è¿­

valueOf

public static RoundingMode  valueOf(String  name)
ÁöÁ¤ÇÑ À̸§À» °¡Áö´Â ÀÌ ÇüÅÂÀÇ ¿­°ÅÇü Á¤¼ö¸¦ ¸®ÅÏÇÕ´Ï´Ù. ij¸¯ÅÍ ¶óÀÎÀº ÀÌ ÇüÅÂÀÇ ¿­°ÅÇü Á¤¼ö¸¦ ¼±¾ðÇϴµ¥ »ç¿ëÇÑ ½Äº°ÀÚ¿Í ¾ö¹ÐÇÏ°Ô ÀÏÄ¡ÇÏ°í ÀÖÀ» ÇÊ¿ä°¡ ÀÖ½À´Ï´Ù (¿©ºÐÀÇ °ø¹é ¹®ÀÚ¸¦ Æ÷ÇÔÇÒ ¼ö ¾ø½À´Ï´Ù).

ÆĶó¹ÌÅÍ:
name - ¸®ÅÏµÈ ¿­°ÅÇü Á¤¼öÀÇ À̸§
¹Ýȯ°ª:
ÁöÁ¤µÈ À̸§À» °¡Áö´Â ¿­°ÅÇü Á¤¼ö
¿¹¿Ü:
IllegalArgumentException - ÁöÁ¤µÈ À̸§À» °¡Áö´Â Á¤¼ö¸¦ÀÌ ¿­°ÅÇüÀÌ °¡Áö°í ÀÖÁö ¾ÊÀº °æ¿ì

valueOf

public static RoundingMode  valueOf(int rm)
BigDecimal À¯»ê Á¤¼ö µÕ±Ù ¸ðµå Á¤¼ö¿¡ ´ëÀÀÇÏ´Â RoundingMode °´Ã¼¸¦ ¸®ÅÏÇÕ´Ï´Ù.

ÆĶó¹ÌÅÍ:
rm - º¯È¯ÇÏ´Â À¯»ê Á¤¼ö µÕ±Ù ¸ðµå
¹Ýȯ°ª:
ÁöÁ¤µÈ Á¤¼ö¿¡ ´ëÀÀÇÏ´Â RoundingMode
¿¹¿Ü:
IllegalArgumentException - Á¤¼ö°¡ ¹üÀ§¿Ü¿¡ ÀÖ´Â °æ¿ì

JavaTM 2 Platform
Standard Ed. 5.0

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