¼Ò¼³°°ÀºÀÚ¹Ù2ºÎ  Á¦6Àå ¹è¿­ Ä÷º¼Ç ¿­°ÅÀÚ  6.3.4 2Â÷¿ø ¹è¿­  

 

6.3.4 2Â÷¿ø ¹è¿­

 ¿©Å±îÁö 1Â÷¿ø ¹è¿­¸¸À» ´Ù·ç¾ú½À´Ï´Ù. 2Â÷¿ø ¹è¿­Àº 1Â÷¿ø¹è¿­°ú º° ´Ù¸¥ Á¡ÀÌ ¾øÁö¸¸ ¼±¾ð°ú ÃʱâÈ­ÀÇ ¹æ¹ý ±×¸®°í 2Â÷¿ø¹è¿­Àº ¹è¿­ÀÇ ¹è¿­À̶ó´Â °Í¸¸À» ±â¾ïÇÏ¸é µÉ °Í °°½À´Ï´Ù.

 

2Â÷¿ø ¹è¿­ÀÇ ÇٽɻçÇ×

n        2Â÷¿ø ¹è¿­ÀÇ ¼±¾ð°ú ÃʱâÈ­

n        2Â÷¿ø ¹è¿­Àº ÂüÁ¶ÀÇ ÂüÁ¶(¹è¿­ÀÇ ¹è¿­)

 

 ¸ÕÀú, 2Â÷¿ø ¹è¿­ÀÇ ¼±¾ðºÎÅÍ »ìÆì º¸±â·Î ÇÏÁÒ. 2Â÷¿ø ¹è¿­Àº 1Â÷¿ø ¹è¿­ÀÇ ÃʱâÈ­¿Í °°ÀÌ Çϳª¾¿ ¼±¾ðÇÒ ¼öµµ ÀÖÀ¸¸ç ÇѲ¨¹ø¿¡ ÃʱâÈ­ ½Ãų ¼öµµ ÀÖ½À´Ï´Ù. ±× ¹æ¹ýÀº ¾Æ·¡¿Í °°½À´Ï´Ù.

 

 

2Â÷¿ø¹è¿­ÀÇ Ã·ÀÚ´Â ¾Õ÷ÀÚ¿Í µÞ÷ÀÚÀÇ Á¶ÇÕÀ» ÀÌ¿ëÇÏ¿© º¯¼öµéÀ» ¸¸µì´Ï´Ù. ¿ª½Ã ¹è¿­ÀÇ À̸§ÀÌ ¹è¿­ÀÌ¸ç ¹è¿­ÀÇ ¿ä¼Ò´Â º¯¼öÀÔ´Ï´Ù. °ªÀ» ÇÒ´çÇÏ´Â ¹æ¹ýÀº À§ÀÇ ±×¸²°ú °°ÀÌ Çϳª¾¿ ÇÒ´çÇÏ´Â ¹æ¹ý°ú µ¿½Ã¿¡ ÇÒ´çÇÏ´Â 2°¡Áö°¡ ÀÖ½À´Ï´Ù. ¾î´À°ÍÀ» »ç¿ëÇÏµç °ªÀ» ÇÒ´çÇÏ´Â °ÍÀº ¸¶Âù°¡Áö ÀÔ´Ï´Ù.

 

2Â÷¿ø ¹è¿­Àº ¹è¿­ÀÇ ¹è¿­À̶ó´Â ¸»À» ¾Ë¾Æ º¸µµ·Ï ÇÏÁÒ. 2Â÷¿ø ¹è¿­¿¡¼­ ¹è¿­Àº 3°³³ª ÀÖ½À´Ï´Ù. ±×°ÍÀº mydream, mydream[0], mydream[1]ÀÔ´Ï´Ù. mydreamÀº mydream[0], mydream[1]À» °¡¸£Å°´Â ¹è¿­À̰í mydream[0]´Â ¹è¿­ÀÇ ¿ä¼ÒÁß ¾Õ ÷ÀÚ°¡ 0ÀÎ °ÍµéÀÇ ¹è¿­ÀÔ´Ï´Ù. ±×¸®°í mydream[1]Àº ¹è¿­ÀÇ ¿ä¼ÒÁß ¾Õ ÷ÀÚ°¡ 1ÀÎ °ÍµéÀÇ ¹è¿­ÀÔ´Ï´Ù. À̰Ϳ¡ ´ëÇÑ ±¸Á¶´Â ¾Æ·¡ÀÇ ±×¸²°ú °°½À´Ï´Ù.

 

 

 ±×¸²¿¡¼­ º¸´Â ¹Ù¿Í °°ÀÌ 3°³ÀÇ º¯¼ö¸¦ ¹­¾î¼­ °¢°¢ mydream[0], mydream[1]ÀÇ ¹è¿­·Î ¸¸µé°í ´Ù½Ã ¹è¿­ mydream[0], mydream[1]À» ¹­¾î¼­ mydreamÀ̶ó´Â ¹è¿­·Î ¹­¾ú½À´Ï´Ù. Áï, mydreamÀº ¹è¿­ÀÇ ¹è¿­ÀÎ °ÍÀÔ´Ï´Ù. ±×¸®°í, mydreamÀº µÎ°³ÀÇ ¹è¿­ÀÌ ÀÖ°í ±× ¸¶Áö¸·¿¡ °¢°¢ 3°³ÀÇ º¯¼ö¸¦ °¡Áö°í ÀÖ´Â °ÍÀÔ´Ï´Ù. ±×·¸´Ù¸é mydream[0], mydream[1]Àº ¹è¿­·Î½á »ç¿ëÇÒ ¼ö ÀÖÀ»±î¿ä? ¸Â½À´Ï´Ù. ¿Ïº®ÇÑ ÇϳªÀÇ ¹è¿­·Î¼­ »ç¿ëÇÒ ¼ö ÀÖ½À´Ï´Ù. ÀÌ·¯ÇÑ °ÍÀ» ¿¹Á¦·Î Áõ¸íÇØ º¸µµ·Ï ÇϰڽÀ´Ï´Ù.

 

 

public class TwoDimensionMain{

             public static void main(String[] args){

                           int[][] mydream1 = new int[][]{{100, 200, 300}, {400,500,600}};

                           int[][] mydream2 = {{1000, 2000, 3000}, {4000,5000,6000}};

                           System.out.println("mydream1ÀÇ °¹¼ö:" + mydream1.length);

                           System.out.println("mydream1[0]ÀÇ °¹¼ö:" + mydream1[0].length);

                           System.out.println("mydream1[1]ÀÇ °¹¼ö:" + mydream1[1].length);

                           System.out.println("mydream2ÀÇ °¹¼ö:" + mydream2.length);

                           System.out.println("mydream2[0]ÀÇ °¹¼ö:" + mydream2[0].length);

                           System.out.println("mydream2[1]ÀÇ °¹¼ö:" + mydream2[1].length);

                           for(int i=0; i<mydream1.length; i++)

                     for(int j=0; j<mydream1[i].length; j++)

                        System.out.println("mydream1["+i+"]["+j+"]=>"+ mydream1[i][j] + "\t");

                           for(int i=0; i<mydream2.length; i++)

                           for(int j=0; j<mydream2[i].length; j++)

                              System.out.println("mydream2["+i+"]["+j+"]=>"+ mydream2[i][j] + "\t");

             }

}

C:\examples\6. Array>javac TwoDimensionMain.java

 

C:\examples\6. Array>java TwoDimensionMain

mydream1ÀÇ °¹¼ö:2

mydream1[0]ÀÇ °¹¼ö:3

mydream1[1]ÀÇ °¹¼ö:3

mydream2ÀÇ °¹¼ö:2

mydream2[0]ÀÇ °¹¼ö:3

mydream2[1]ÀÇ °¹¼ö:3

mydream1[0][0]=>100

mydream1[0][1]=>200

mydream1[0][2]=>300

mydream1[1][0]=>400

mydream1[1][1]=>500

mydream1[1][2]=>600

mydream2[0][0]=>1000

mydream2[0][1]=>2000

mydream2[0][2]=>3000

mydream2[1][0]=>4000

mydream2[1][1]=>5000

mydream2[1][2]=>6000

 

 ÀÌ ¿¹Á¦¿¡¼­´Â 2Â÷¿ø ¹è¿­ÀÇ ÃʱâÈ­ ºÎºÐÀ» Á¤È®ÇÏ°Ô º¸¿© ÁÖ°í ÀÖ½À´Ï´Ù. 2Â÷¿ø ¹è¿­Àº 1Â÷¿ø ¹è¿­°ú ÃʱâÈ­ ¹æ¹ýÀÌ °°Áö¸¸, ºí·ÏÀ» Á¤ÇØÁÖ´Â °ÍÀÌ ´Ù¸¨´Ï´Ù.

 

    2Â÷¿ø ¹è¿­ÀÇ ¼±¾ð°ú ÃʱâÈ­¸¦ µ¿½Ã¿¡ ÇÏ´Â ¹æ¹ý

n        int[][] mydream1 = new int[][]{{100, 200, 300}, {400,500,600}};

n        int[][] mydream2 = {{1000, 2000, 3000}, {4000,5000,6000}};

 

2Â÷¿ø ¹è¿­ÀÌ ¹è¿­ÀÇ ¹è¿­À̶ó´Â Áõ°Å´Â ´ÙÀ½ÀÇ ±¸¹®¿¡¼­ ã¾Æ º¼ ¼ö ÀÖ½À´Ï´Ù.

 

n        System.out.println("mydream1ÀÇ °¹¼ö:" + mydream1.length);

n        System.out.println("mydream1[0]ÀÇ °¹¼ö:" + mydream1[0].length);

n        System.out.println("mydream1[1]ÀÇ °¹¼ö:" + mydream1[1].length);

 

mydream1Àº ¿ø·¡ºÎÅÍ ¹è¿­À̱⠶§¹®¿¡ length¶ó´Â ¸â¹öÇʵ带 »ç¿ëÇÒ ¼ö ÀÖ½À´Ï´Ù. °ªÀº 2°¡ ³ª¿É´Ï´Ù.

 

n         mydream1[0] à {100, 200, 300} à mydream1[0].length ´Â 3

n         mydream1[1] à {400, 500, 600} à mydream1[1].length ´Â 3

 

±×°ÍÀº ¹è¿­ÀÇ ¹è¿­À̱⠶§¹®¿¡ ±×·¸ÁÒ. mydream1[0]¿Í mydream1[1]ÀÌ ¿ä¼Ò°¡ µË´Ï´Ù. ±×¸®°í ÀÌ ¿ä¼ÒµéÀº ¹è¿­ÀÔ´Ï´Ù. ±× Áõ°Å ¶ÇÇÑ À§¿¡¼­ lengthÇʵ带 »ç¿ëÇÏ´Â °ÍÀ¸·Î ¾Ë ¼ö ÀÖ½À´Ï´Ù.

 

 

°á±¹ mydream1[2][3]¿¡¼­ ÇÊ¿äÇÑ °ÍÀº ¹è¿­ÀÇ À̸§ 3°³¿Í º¯¼ö 6°³°¡ µÇ´Â °ÍÀÔ´Ï´Ù.

 

n         mydream1 ±×ÀÚü:1

n         mydream1ÀÇ °¹¼ö:2

n         mydream1[0]ÀÇ °¹¼ö:3

n         mydream1[1]ÀÇ °¹¼ö:3

 

 ´ÙÂ÷¿ø ¹è¿­ÀÇ ¿ø¸®´Â ÀüºÎ ÀÌ¿Í °°½À´Ï´Ù. ±âº» ¿ø¸®¸¸ ¾Ë°í ÀÖ´Ù¸é ¾Æ¹«¸® Â÷¿øÀÌ ³ôÀº ¹è¿­µµ ½±°Ô ÇÚµé ÇÒ ¼ö ÀÖÀ» °ÍÀÔ´Ï´Ù.



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