231212 JAVA - ArrayCopy01

 package dec12;

 

 import java.util.Arrays;

 

 //배열복사 : 배열의 값을 다른 배열에 복사하기 195p

 public class ArrayCopy01 {

 

  public static void main(String[] args) {

  int arr1[]=new int[] {10,20,30,40,50,60};

  int arr2[]=new int[arr1.length];

 

  arr2[0] = arr1[0];

  //깊은 복사 = 실제 값을 새로운 메모리 공간에 복사

  //얕은 복사 = 주소 값을 복사합니다.

  arr2=arr1; //얕은 복사

  arr1[0]=100;

  arr1[2]=999;

 

  System.out.println(Arrays.toString(arr1));

  System.out.println(Arrays.toString(arr2));//왜 같아?> 얕은 복사

 

  System.out.println(arr1);

  System.out.println(arr2);

 

 

  System.out.println("==깊은복사 196p===============================================");

  //깊은 복사

  arr2=new int[6];

 

  arr2[0]=arr1[0];

  arr2[1]=arr1[1];

  arr2[2]=arr1[2];

  arr2[3]=arr1[3];

  arr2[4]=arr1[4];

  arr2[5]=arr1[5];

 

  arr1[0]=1000;

  arr2[5]=6;

  System.out.println(Arrays.toString(arr1));

  System.out.println(Arrays.toString(arr2));

  System.out.println(arr1);

  System.out.println(arr2);

 

 

  }

 

 }

 

 

 [100, 20, 999, 40, 50, 60]

 [100, 20, 999, 40, 50, 60]

 [I@515f550a

 [I@515f550a

 ==깊은복사 196p===============================================

 [1000, 20, 999, 40, 50, 60]

 [100, 20, 999, 40, 50, 6]

 [I@515f550a

 [I@626b2d4a