# 내부 속성이 똑같은 두 클래스간의 캐스팅 테스트

Prototype 패턴 발표중에 Object의 clone()메서드는 Object 타입으로 업캐스팅하여 복사한 다음 Object 클래스를 반환한다는점에서 클래스는 다르지만  내부 프로퍼티 , 메서드 모두 같으면 캐스팅이 되는지에 대한 궁금증을 해결하고자 작성한 실험 글.

```java
public class TestChild {
    private String name;
    public TestChild(String name) {
        this.name = name;
    }
    public String getName() {
        return name;
    }
}

public class Test2 implements Cloneable {
    private String name;
    public Test2(String name) {
        this.name = name;
    }
    @Override
    public TestChild clone() {
        TestChild clone = (TestChild) super.clone();
        return clone;
    }
}

public static void main(String[] args) throws CloneNotSupportedException {
        Test2 test2 = new Test2("test2");
        TestChild testChild2 = test2.clone();
        System.out.println(testChild2.getName());
}

//결과
//ClassCastException 발생
```

```java
public class Child1 {
    private String name;
    public Child1(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public Object clone() throws CloneNotSupportedException {
        return super.clone();
    }
}
public class Child2 implements Cloneable{
    private String name;
    public Child2(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public Object clone() throws CloneNotSupportedException {
        return super.clone();
    }

}

public class Study {
    public static void main(String[] args) throws CloneNotSupportedException {
        Child2 child2 = new Child2("child2");
        Child1 child1 = (Child1) child2.clone();
        System.out.println(child1.getName());
    }
}

//결과
//ClassCastException 발생
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://nelmm.gitbook.io/nelmm/design-pattern/issue/undefined.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.