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小测验1.以下那些是合法的顶级类(Top level class)定义?假设下面的每个类都被定义在不同的 Java 源文件中。a)public class XY{}b)protected class ZA{}c)public class XX emends A,B{}d)profected class Z emends Objecl{}e)public class XYZ() extends Object{}f)private class extends Object{}
Quiz 1. Which of the following is a valid top level class definition? Assume that each of the following classes is defined in a different Java source file. a) public class XY {} b) protected class ZA {} c) public class XX emends A, B {} d) profected class Z emends Objecl {} e) public class XYZ () extends Object {} f) private class extends Object {}