¼Ò¼³°°ÀºÀÚ¹Ù1ºÎ  4Àå. Class for Java  »ý¼ºÀÚ¸Þ¼­µå  

4.2 »ý¼ºÀÚ¸Þ¼­µå

4.2.1 »ý¼ºÀÚ¸Þ¼­µå

»ý¼ºÀÚ¸Þ¼­µå¶õ Ŭ·¡½º¸¦ ÀÌ¿ëÇÏ¿© ¸Þ¸ð¸®¸¦ °¡Áø instance Áï, °´Ã¼¸¦ »ý¼ºÇÒ ¶§ Á¦ÀÏ ¸ÕÀú È£ÃâµÇ´Â ¸Þ¼­µåÀÔ´Ï´Ù.

 

»ý¼ºÀÚ¸Þ¼­µåÀÇ Á¤ÀÇ

n        °´Ã¼¸¦ »ý¼º°ú µ¿½Ã¿¡ ±âº»ÀûÀ¸·Î È£Ã⠵ǾîÁö´Â ¸Þ¼­µå

 

¿©·¯ºÐÀº ÀÌ¹Ì »ý¼ºÀÚ¸Þ¼­µå¸¦ »ç¿ëÇϰí ÀÖ¾ú½À´Ï´Ù. »ý¼ºÀÚ¸Þ¼­µå¸¦ ¿©·¯ºÐÀÌ µû·Î ¸¸µéÁö ¾Ê´Â´Ù¸é ¿©·¯ºÐÀÌ ¸¸µç Ŭ·¡½º¿¡¼­ ÀÚµ¿À¸·Î µðÆúÆ®»ý¼ºÀÚ°¡ ¸¸µé¾îÁö°Ô µË´Ï´Ù. ¾Õ ÀýÀÇ ¿¹Á¦¿¡¼­ ¿ì¸®´Â ´ÙÀ½°ú °°Àº ±¸¹®À» »ç¿ëÇß½À´Ï´Ù.

 

MainTest.java(µðÆúÆ® »ý¼ºÀÚ¸Þ¼­µå¸¦ À§ÇÑ ¿¹Á¦)

public class MainTest{

             public void sayHello(){

                           System.out.println("Hello World!");

             }

 

             public static void main(String[] args){

                           MainTest m = new Ma inTest();

                           m.sayHello();

             }

}

MainTest()¶ó´Â ¸Þ¼­µå´Â ¾ø½À´Ï´Ù. ¸¸µéÁöµµ ¾Ê¾ÒÁÒ. ÀÌ ¶§ ¿©·¯ºÐÀÌ »ý¼ºÀÚ¸Þ¼­µå¶óÇÏ¿© Ŭ·¡½ºÀÇ À̸§°ú °°Àº ¸Þ¼­µå¸¦ ¸¸µéÁö ¾Ê´Â´Ù¸é ÀÚ¹Ù¿¡¼­ ±âº»ÀûÀ¸·Î µðÆúÆ® »ý¼ºÀÚ¶ó´Â °ÍÀÌ ¸¸µé¾îÁö´Âµ¥ ÀÌ µðÆúÆ® »ý¼ºÀÚ°¡ ¹Ù·Î MainTest()ÀÔ´Ï´Ù. ¸Þ¸ð¸®°¡ »ý¼ºµÈ Á÷ÈÄ °¡Àå ¸ÕÀú È£ÃâµÇ´Â ¸Þ¼­µåÀÔ´Ï´Ù. ¹°·Ð ÇöÀçÀÇ µðÆúÆ® »ý¼ºÀÚ´Â ÇÏ´Â ÀÏÀÌ ¾ø½À´Ï´Ù. ´ÜÁö »ý¼ºÀÚ¶ó°í Ç¥½Ã¸¸ ÇÒ »ÓÀÔ´Ï´Ù.

 

Áï, Ŭ·¡½º¸¦ ¸¸µé ¶§ »ç¿ëÀÚ°¡ µû·Î »ý¼ºÀÚ¸¦ ¸¸µéÁö ¾Ê´Â´Ù¸é ¸Å°³º¯¼ö°¡ ¾ø´Â µðÆúÆ® »ý¼ºÀÚ¸Þ¼­µå ¡°MainTest()¡±°¡ ¸¸µé¾îÁ®¼­ »ç¿ëµÇ¸ç, µðÆúÆ® »ý¼ºÀÚ¸Þ¼­µå¸¦ ¿©·¯ºÐÀÌ ¾à°£ º¯ÇüÇÏ¿© ¸¸µé°Å³ª ¾Æ´Ï¸é ¸Å°³º¯¼ö°¡ ÀÖ´Â »ý¼ºÀÚ¸Þ¼­µå¸¦ ´Ù½Ã ¸¸µç´Ù¸é ±âÁ¸ÀÇ µðÆúÆ® »ý¼ºÀÚ¸Þ¼­µå´Â ¾ø¾îÁö°í »õ·Î¿î »ý¼ºÀÚ°¡ ¸¸µé¾îÁö´Â °ÍÀÔ´Ï´Ù.

 

 

4.2.2 »ý¼ºÀÚ¸Þ¼­µåÀÇ Æ¯Â¡

  »ý¼ºÀÚ¸Þ¼­µå´Â À¯ÀÏÇÏ°Ô ¸®ÅÏŸÀÔÀÌ ¾ø´Â ¸Þ¼­µåÀÔ´Ï´Ù. ±×¸®°í »ý¼ºÀÚ¸Þ¼­µåÀÇ À̸§Àº Ŭ·¡½ºÀÇ À̸§°ú µ¿ÀÏÇϸç ÀϹÝÀûÀ¸·Î ÃʱâÈ­³ª ¸â¹öÀÇ ±âº»°ª ÇÒ´çÀ» À§ÇØ »ç¿ëµË´Ï´Ù. º¸ÅëÀÇ °æ¿ì Ŭ·¡½º ÀÛ¾÷À» ÇÒ ¶§ Á¦ÀÏ ¸ÕÀú ÇÁ·Î±×·¥ÇØ¾ß ÇÏ´Â °ÍµéÀ» »ý¼ºÀÚ¸Þ¼­µå ³»¿¡ ÇÁ·Î±×·¥ÇÏ°Ô µË´Ï´Ù.

 

»ý¼ºÀÚ¸Þ¼­µåÀÇ Æ¯Â¡

n        ¸Þ¼­µåÀÇ ¸®ÅÏŸÀÔÀÌ ¾ø´Ù.

n        ¸Þ¼­µåÀÇ À̸§Àº Ŭ·¡½ºÀÇ À̸§°ú µ¿ÀÏÇÏ´Ù.

n        new»ý¼ºÀÚ°¡ ¸Þ¸ð¸®¸¦ »ý¼ºÇÑ Á÷ÈÄ È£Ã⠵ǾîÁø´Ù.

 

»ý¼ºÀÚ¸Þ¼­µå´Â new¿¬»êÀÚ¿Í ÇÔ²² »ç¿ëµÇ´Âµ¥ new¿¬»êÀÚ°¡ ¸Þ¸ð¸®¸¦ »ý¼ºÇÏ°í ³ª¸é ¸â¹ö º¯¼öµéÀÌ ¸Þ¸ð¸®¸¦ ÇÒ´ç ¹Þ°Ô µË´Ï´Ù. ¸â¹ö º¯¼öµéÀÌ ¸Þ¸ð¸®°¡ Á¸ÀçÇϱ⠶§¹®¿¡ ¸â¹öÇʵ忡 °ªÀ» ÇÒ´çÇϰųª ÃʱâÈ­¸¦ ÇÒ ¼ö ÀÖ½À´Ï´Ù. À̶§ »ý¼ºÀÚ ¸Þ¼­µå°¡ Ȱµ¿À» ÇÏ´Â °ÍÀÔ´Ï´Ù. º¸ÅëÀº ¸â¹öÇʵåÀÇ ÃʱâÈ­¸¦ ÁÖ·ÎÇÏÁö¸¸ ÇÊ¿äÇÏ´Ù¸é °´Ã¼ÀÇ »ý¼º°ú µ¿½Ã¿¡ ÇØ ÁÖ¾î¾ß ÇÏ´Â ÀÛ¾÷µéÀ» ÀÌ »ý¼ºÀÚ¸Þ¼­µå¿¡¼­ ÇÏ°Ô µË´Ï´Ù. »ý¼ºÀÚ°¡ ¾ø´Â Ŭ·¡½º¿¡ ´ëÇÏ¿© ÄÄÆÄÀÏ·¯´Â Àμö ¸®½ºÆ®¸¦ °¡ÁöÁö ¾Ê´Â »ý¼ºÀÚ¸Þ¼­µå¸¦ ÀÚµ¿À¸·Î Á¦°øÇÕ´Ï´Ù. ÀÌ »ý¼ºÀÚ¸¦ ¿ì¸®´Â µðÆúÆ® »ý¼ºÀÚ¶ó°í ºÎ¸¨´Ï´Ù.

 

»ý¼ºÀÚÀÇ ¿ªÇÒÀº ÃʱâÈ­ ÀÛ¾÷À̶ó°í Çß½À´Ï´Ù. »ý¼ºÀÚ¿¡ °ü·ÃµÈ ¿¹Á¦¸¦ Çϳª ¸¸µé¾î º¸µµ·Ï ÇÏÁÒ.

 

ConstructTest.java(»ý¼ºÀÚ¸Þ¼­µå¸¦ À§ÇÑ ¿¹Á¦)

public class ConstructTest {

             private String name = null;

             private String address = null;

             private int age = 0;

             public ConstructTest(){

                           name = "À̸§¾øÀ½";

                           address="ÁÖ¼Ò¾øÀ½";

                           age=0;

             }

             public void setList(String sname, String saddress, int sage){

                           name = sname;

                           address = saddress;

                           age = sage;

             }

             public String getList(){

                           String str = name + "  " + address + "   " + age;

                           return str;

             }

             public static void main(String[] args) {

                           ConstructTest ct = new ConstructTest();

                           String s;

                           s = ct.getList();

                           System.out.println(s);

 

                           ct.setList("È«±æµ¿", "¼­¿ï½Ã Áß±¸", 25);

                           s = ct.getList();

                           System.out.println(s);

             }

}

C:\examples\4. Class for Basic Java>java ConstructTest

À̸§¾øÀ½  ÁÖ¼Ò¾øÀ½   0

È«±æµ¿  ¼­¿ï½Ã Áß±¸   25

 

»ý¼ºÀÚ¸Þ¼­µå¿¡¼­ °ªÀ» name, address, age ¸â¹öÇʵ忡 ÇÒ´çÇϰí ÀÖ½À´Ï´Ù. ±×·¸±â ¶§¹®¿¡ °´Ã¼¸¦ »ý¼ºÇÑ Á÷ÈÄ ¹Ù·Î getList¸â¹ö¸Þ¼­µå¸¦ È£Ãâ ÇßÀ» ¶§ »ý¼ºÀÚ¸Þ¼­µå¿¡¼­ ÃʱâÈ­ ÇÑ °ªÀ» ¾òÀ» ¼ö ÀÖ½À´Ï´Ù. ´Ù½Ã setList¸Þ¼­µå¸¦ ÅëÇØ¼­ °ªÀ» ÇÒ´çÇÑ ÀÌÈÄ¿¡´Â ¹Ù²î°ÚÁÒ. ÀÌ·¸°Ô »ý¼ºÀÚ¿¡¼­ ¿ì¼±ÀûÀ¸·Î °ªÀ» ÇÒ´çÇØ¾ß ÇÒ °æ¿ì°¡ ÀÖ´Ù¸é »ý¼ºÀÚ¸Þ¼­µå¸¦ ÀÌ¿ëÇÏ¸é ¾ÆÁÖ ÆíÇÏ°Ô ÇØ°áÇÒ ¼ö ÀÖ½À´Ï´Ù.

 

»ý¼ºÀÚ¸Þ¼­µåµµ ¸Å°³º¯¼ö¸¦ ÀÌ¿ëÇÏ¿© ¿ÜºÎ·ÎºÎÅÍ Á÷Á¢ »ý¼ºÀÚ¸Þ¼­µå¿¡ °ªÀ» ÇÒ´çÇÏ´Â ¹æ¹ýÀ¸·Î ¸â¹öÇʵ带 ÃʱâÈ­ ÇÒ ¼ö µµ ÀÖ½À´Ï´Ù. ±× ¿¹¸¦ »ìÆì º¸±â·Î ÇÏÁÒ.

 

ConstructDirect.java(»ý¼ºÀÚ¸Þ¼­µå¸¦ À§ÇÑ ¿¹Á¦)

public class ConstructDirect{

             private String name = null;

             private String address = null;

             private int age = 0;

             public ConstructDirect(String sname, String saddress, int sage){

                           name = sname;

                           address = saddress;

                           age = sage;

             }

             public void setList(String sname, String saddress, int sage){

                           name = sname;

                           address = saddress;

                           age = sage;

             }

             public String getList(){

                           String str = name + "  " + address + "   " + age;

                           return str;

             }

             public static void main(String[] args) {

                           ConstructDirect ct = new ConstructDirect("È«±æµ¿", "¼­¿ï½Ã Áß±¸", 25);

                           String s;

                           s = ct.getList();

                           System.out.println(s);

             }

}

C:\examples\4. Class for Basic Java>javac ConstructDirect.java

 

C:\examples\4. Class for Basic Java>java ConstructDirect

È«±æµ¿  ¼­¿ï½Ã Áß±¸   25

 

¿ì¸®´Â ÀÌ ¿¹Á¦¿¡¼­ »ý¼ºÀÚ¿¡¼­ ¸Å°³º¯¼ö¸¦ »ç¿ëÇÏ´Â ¹æ¹ýÀ» ½±°Ô º¼ ¼ö ÀÖ½À´Ï´Ù. ¸¸¾à ¿©·¯ºÐÀÌ ÀÌ ¿¹Á¦Ã³·³ ¸Å°³º¯¼ö°¡ ÀÖ´Â »ý¼ºÀÚ¸Þ¼­µå¸¦ ¸¸µé¾ú´Ù¸é µðÆúÆ® »ý¼ºÀÚ´Â ´õ ÀÌ»ó »ç¿ëÇÒ ¼ö ¾ø½À´Ï´Ù. ±×¸®°í ¹Ýµå½Ã »ý¼ºÀÚ¸Þ¼­µå¸¦ »ç¿ëµÉ ¶§ ¸Å°³º¯¼öÀÇ °³¼ö¿Í ÇüÀ» ¸ÂÃß¾î ÁÖ¾î¾ß ÇÕ´Ï´Ù. ¸Þ¼­µå´Â ¸Å°³º¯¼öÀÇ °³¼ö¿Í ¸Å°³º¯¼öÀÇ Çü¿¡ ¸ñ¼ûÀ» °É°í ÀÖ½À´Ï´Ù. ±×¸®°í »ý¼ºÀÚ¸Þ¼­µå¿¡´Â ¸®ÅÏŸÀÔÀÌ ¾ø±â ¶§¹®¿¡ ´ç¿¬È÷ ¸®ÅÏÀ̶ó´Â °ÍÀÌ ¾ø½À´Ï´Ù. ´Ù¸¥ ÀÏ¹Ý ¸Þ¼­µå ¶ÇÇÑ ¸®ÅÏŸÀÔ°ú ¸®ÅϰªÀº ¹Ýµå½Ã ÁöÄÑ¾ß ÇÕ´Ï´Ù.

 

 

4.2.3 °á·Ð

 »ý¼ºÀÚ¸Þ¼­µå´Â ¸» ±×´ë·Î »ý¼ºµÉ ¶§ È£Ã⠵Ǵ ¸Þ¼­µåÀÔ´Ï´Ù. ±× À¯¿ëÇÔÀº °´Ã¼ »ý¼º¼ø°£¿¡ °°ÀÌ È£Ãâ µÉ ¼ö ÀÖ´Ù´Â ÀåÁ¡ÀÌ ÀÖ½À´Ï´Ù. ÀÌ »ý¼ºÀÚ¸¦ ¾ÆÁÖ À¯¿ëÇÏ°Ô »ç¿ëÇÏ¸é Æí¸®ÇÑÁ¡ »Ó¸¸ ¾Æ´Ï¶ó ¹Ýµå½Ã ÇÊ¿äÇÑ ¸Þ¼­µåÀÔ´Ï´Ù. ¹°·Ð ±×°ÍÀº ¾ÆÁÖ ¹Ì¼¼ÇÑ °ÍÀÌÁö¸¸ ÀÌ·¸°Ô »ý°¢ ÇØ º¼ ¼ö ÀÖ½À´Ï´Ù. ¸¸¾à Àΰ£À̶ó´Â µ¥ÀÌÅÍ Å¸ÀÔÀ¸·Î ¾Æ±â¸¦ ¸¸µç´Ù°í »ý°¢ ÇØ º¸½Ê½Ã¿À. ¾Æ±â´Â ¾î´À Á¤µµ ÃʱâÈ­´Â µÇ¾î ÀÖ¾î¾ß ÇÕ´Ï´Ù. ´«, ÄÚ, ÀÔ, ÆÈ, ´Ù¸®µî ÇʼöÀûÀÎ ¿ä¼ÒµéÀº ÀüºÎ ÃʱâÈ­ µÇ¾î ÀÖ¾î¾ß ÇÕ´Ï´Ù. ÀÌ·¯ÇÑ ¸é¿¡¼­ º»´Ù¸é »ý¼º¼ø°£¿¡ ÇØ ÁÖ¾î¾ß ÇÏ´Â ÀÏÀº ¾ÆÁÖ Áß¿äÇÑ ÀÏÀÔ´Ï´Ù. ¸¸¾à À̰ÍÀ» À߸øÇÏ°Ô µÇ¸é ¾Æ¸¶ ¿©·¯ºÐµéÀÌ ¸¸µç °´Ã¼´Â ÀÌ»óÇÑ ±«Â¥ °´Ã¼°¡ µÇ°í ¸» °ÍÀÔ´Ï´Ù.



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