Question

为什么 < enger > doesn t object. clone () 需要明确标记? 这不是“ 下播总是需要和明确标记” 规则的例外吗? 我用 JDK1.6.0_29 编译并成功运行了以下代码, 使用 Javac 命令线和 Eclipse Helios 。

public class Main {

    public static void main(String[] args) {
        byte[] original = { 1, 2, 3, 4 };
        byte[] copy = original.clone();

        for (byte b : copy) {
            System.out.print(b + " ");
        }

        int[] originalInt = { 11, 22, 33, 44 };
        int[] copyInt = originalInt.clone();

        for (int i : copyInt) {
            System.out.print(i + " ");
        }

        String[] originalStr = { "1", "2", "3", "4" };
        String[] copyStr = originalStr.clone();

        for (String s : copyStr) {
            System.out.print(s + " ");
        }

        Main[] originalMain = { new Main() };
        Main[] copyMain = originalMain.clone();

        for (Main m : copyMain) {
            System.out.print(m + " ");
        }
    } // end method main

} // end class Main

Answer 1

您不能调用 Object.clone () 。您调用 T[].clone () , 以返回 T[] 。

JLS 10.7 阵列成员 :

数组类型的成员全部如下:

The public method clone, which overrides the method of the same name in class Object and throws no checked exceptions. The return type of the clone method of an array type T[] is T[].

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