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| 9. 10. 26. 复制和克隆列表 |
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- When you call the clone() method of an ArrayList, a shallow copy of the list is created.
- The new list refers to the same set of elements as the original.
- It does not duplicate those elements.
- Since clone() is a method of the ArrayList class and not the List (or Collection) interface,
you must call clone() on a reference to the class, not the interface.
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import java.util.ArrayList;
import java.util.List;
public class MainClass {
public static void main(String[] a) {
List list = new ArrayList();
list.add("A");
List list2 = ((List) ((ArrayList) list).clone());
System.out.println(list);
System.out.println(list2);
list.clear();
System.out.println(list);
System.out.println(list2);
}
}
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[A]
[A]
[]
[A] |
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