깊은 복사와 얕은 복사

얕은 복사

얕은 복사가 일어나는 이유

...

public class Main {
    public static void main(String[] args) {
        int[] term1 = {100, 200, 300};
        int[] term2 = term1;
        System.out.println(term1 + " " + term2); // shallow copy
        term2[0] = 96;
        System.out.println(Arrays.toString(term1));
        System.out.println(Arrays.toString(term2));
    }
}

결과

[I@3af49f1c [I@3af49f1c
[96, 200, 300]
[96, 200, 300]

깊은 복사

1️⃣ clone()

public class Main {
    public static void main(String[] args) {
        int[] term3 = {100, 200, 300};
        int[] term4 = term3.clone();
        System.out.println(term3 + " " + term4); // deep copy
        term4[0] = 96;
        System.out.println(Arrays.toString(term3));
        System.out.println(Arrays.toString(term4));
    }
}

결과

[I@19469ea2 [I@13221655
[100, 200, 300]
[96, 200, 300]