깊은 복사와 얕은 복사
package practice;
import java.util.Arrays;
public class CopyTest {
public static void main(String[] args) {
// TODO Auto-generated method stub
int[] data = { 0, 1, 2, 3, 4 };
int[] sCopy = null;
int[] dCopy = null;
sCopy = shallowCopy(data); //얕은 복사, 원본이 바뀌면 바뀜
dCopy = deepCopy(data); //깊은 복사, 원본과 관계 없이 진짜 데이터를 복사
System.out.println("Original:" + Arrays.toString(data));
System.out.println("Shallow:" + Arrays.toString(sCopy));
System.out.println("Deep:" + Arrays.toString(dCopy));
System.out.println();
data[0] = 5;
System.out.println("Original:" + Arrays.toString(data));
System.out.println("Shallow:" + Arrays.toString(sCopy));
System.out.println("Deep:" + Arrays.toString(dCopy));
System.out.println();
}
public static int[] shallowCopy(int[] arr) {
return arr;
}
public static int[] deepCopy(int[] arr) {
if (arr == null)
return null;
int[] result = new int[arr.length];
System.arraycopy(arr, 0, result, 0, arr.length);
return result;
}
}